• 中国中文核心期刊
  • 中国科学引文数据库(CSCD)核心库来源期刊
  • 中国科技论文统计源期刊(CJCR)
  • 第二届国家期刊奖提名奖

2008 Vol. 21, No. 6

Display Method:
Research on Structure Control of High Y ield B am busa oldham iBamboo Shoot Stands Ba sing on N /S
CHEN Shuang-lin, YANG Qing-ping, CHEN Chang-yuan
2008, 21(6): 741-744.
Abstract:
According to the charaters of sympodial bamboo which developed an uniform clone of the whole clump,this paper p romoted the concep tion of N /S for sympodial bamboo stands structure: the number of living culms (N )to the surface of the subterranean parts occup ied of a clump (S ). The structure control of high efficiency utilizingenvironment resources for bamboo stands on B am busa oldham i was investigated. The results suggested that therelationship of N /S and cluster shoots output showed a single-peak parabola, and the best ratio of N /S was 4. 0—5. 0 culms·m-2. the surface of the subterranean parts occup ied of a clump increased with cluster crown linearly.Environment utilizing efficiency could be increased by increasing p lant density and expanding the surface of thesubterranean parts. The normal high yield structures were as following: individual numbers was 9 200—11 500culms·hm-2 , the surface of the subterranean parts was 2 300 m2 ·hm-2 , soil utilizing efficiency app roach to23. 0% , and p lant density could be increased to about 1 050 clusters·hm-2.
Forest Volume Estima tion Method for Sma ll Area s Ba sedon k-NN and Landsa t Da ta
CHEN Er-xue, LI Zeng-yuan, WU Hong-gan, HAN Ai-hui
2008, 21(6): 745-750.
Abstract:
The effectiveness of k-Nearest Neighbour ( k-NN ) for forest parameters estimation of small area wasevaluated using permanent forest p lot data of national forest inventory (NFI) , Landsat TM data and landuse map datain a test site located in J ilin Province. Itwas found that the bias of the mean volume per unit area estimated using k-NN was under 1. 5 m3 ·hm-2 , and the relative rootmean square error (RMSE′) was less than that of the conventionallineal regressmethod based on the relationship between Landsat ETM + greenness index and forest volume density; k-NN could be used to estimate forest parameters of small unit in the scale of counties or districts, whose performancecould be better than that of traditional population based statistic method that only utilizes forest p lot data.
Spatial Heterogene ities of Tree Growth in Subtropica lMounta in Broad-leavedM ixed Forest
ZHAO An-jiu, HU Ting-xing, CHEN Xiao-hong
2008, 21(6): 751-756.
Abstract:
One permanent p lot with 100 m ×100 m was established to study the structure and function of mountainbroad-leaved mixed forest ecosystem in southwestern Sichuan (102°50′E, 30°02′N). The relative position of everytree wasmeasured by compass. By analysis of geostatistics, diameter at breast height and basal area of forest standshowed spatial autocorrelations in strict ranges, further more, they rep resented spatial varieties only in orientationsof 45 degree; basal area increment (BA I) of each tree species showed spatial varieties only in orientations of 45degree during 1986—1991, 1986—1996, 1986—2001, 1986—2006. Researches on spatial heterogeneities of treeBA I could put afford meaningful references for studying ecological structures and functions of subtrop icalMountainbroad-leaved mixed forest.
Applica tion of Rank-Sum Test in Checking the Effects of Thinn ingon the Growth of Planta tion
LI Chun-ming, ZHANG Hui-ru
2008, 21(6): 757-760.
Abstract:
The rank-sum test is an important non-parametric statisticalmethod. The growth percentage of basal areaand volume of 16 La rix olgensis p lotswith different thinning densities inWangQing ForestryBureau was calculated.The rank-sum testwas used to analyze the effects of thinning on stand growth and compare it with the analysis ofvariance used in parametric statistical method. The result showed that the rank-sum test could rep lace analysis ofvariance, furthermore, calculating was simp leness and convenience.
Landscape Dynam ics of Rocky Desertif ica ted Lands in KarstMounta inousReg ion of North Guangdong in Recen t 30 Years
ZHANG Su-hong, LI Sen, WANG Jin-hua, HAO Jun-min, WU Bo
2008, 21(6): 761-767.
Abstract:
Based on remote sensing images in Karst area of north Guangdong in 1974, 1988 and 2004 and the fieldinvestigation, three landscape map s of the Karstmountainous region in north Guangdong were p roduced. In recent30 years, the rocky desertification in north Guangdong is experiencing a reverse p rocess. The area of rockydesertification lands in 1974 was 2 042. 43 km2 , covering 42. 47% of the Karst region in study area. In 1988 and2004, the ratios of rocky desertification lands reduced to 33. 95% and 21. 14% respectively. Slight rockydesertification land had the fastest decrease speed in the past 30 years among the different degradation degrees ofrocky desertification lands, and in 2004 the moderate rocky desertification land appeared to have the largestp roportion. The landscape heterogeneity of Karst region dep ressed continuously, and the landscape connectivityenhanced. The patch density of rocky desertification lands increased but the mean patch area decreased. The area ofpatches of rocky desertification lands has tended to be even.
Analysis of Genetic Diversity in Lycoris radiata Using ISSRMarker
ZUO Hui, YANG Zhi-ling, YANG Xu, TAN Zi-feng, YU Hua-hui
2008, 21(6): 768-772.
Abstract:
The genetic diversity of 14 Lycoris radiata populations was analyzed by ISSR markers. The results ofPOPGEN32 analysis showed that at species level, the percentage of polymorphics was 92. 31% , Shannon’s index(H) was 0. 459 7, and Nei’s gene diversity ( I) was 0. 302 5, indicating a high level of genetic diversity. But atpopulation level, theywere 49. 65% , 0. 262 0 and 0. 176 3, respectively, suggesting a low level of genetic diversity.And the gene differentiation coefficient (Gst) and gene flow (Nm ) among the populations were 0. 503 5 and0. 698 3, respectively. The analysis ofmolecular variance (AMOVA) demonstrated that there was a relatively highlevel genetic variation (46. 12% ) among the populations, and there was relatively low genetic variation (53. 88% )within the populations. The high genetic differentiation among populations and the low genetic diversity withinpopulations could be attributed to the habitat fragmentation and the limited gene flow among populations.
Study on Shoot Nutrition of Qiongzhuea tum idinoda: A Rare andProtected Bamboo Species
YUAN Jin-ling, XIONG Deng-gao, HU Bing-tang, JIN Guang, ZHONG Zhi-qi, HUANG Liang-jiang, MA Nai-xun
2008, 21(6): 773-777.
Abstract:
The shoot characteristics and its nutritional composition of a rare and endemic bamboo Q iongzhueatum idinoda were investigated and determined. The results showed that the sheath and flesh had an average weight of45. 48% and 54. 52%, respectively; the flesh was composed by 90. 80% water and 9. 20% drymaterial, the latteramounted to 4. 99% of the whole fresh weight. Dried shoots contained 348. 3 mg·g-1 p rotein, 349. 93 mg·g-1amino acid, 115 mg·g-1 fat, 29. 8 mg·g-1 soluble sugar, 68. 2 mg·g-1 P, 0. 07 mg·g-1 Fe, 0. 54 mg·g-1Ca, 1. 63 mg·g-1 Mg, 134. 80 mg·kg-1 Zn and 0. 50 mg·kg-1 Se. The composition of p rotein and amino acidsin Q. tum idinoda shoots varies among geographical sites, the middle and west geographical p rovenances showed ahigher content; both reduced alongwith the elevation and the shoot period; they decreased evidently from the upperto the lower part in shoots; boiled shoots had the highest p rotein content of 405. 6 mg·g-1 in all samp les, whereasabout 75% amino acids lost; both increased after fertilization. Suggestions were given on the selection ofgeographical p rovenance, fertilization and managementmethod of Q. tum idinoda for its sustainable development onutilization and resource conservation.
Character istics of Photosynthesis in Three DendrobiumSpecies with Ten CultureMedia
WANG Yan, SUN Ye, LI Zhen-jian, YUE Hua
2008, 21(6): 778-782.
Abstract:
The experiments were made with Den. crepidatum, Den. chrysotoxum and Den. trigonopus. Thephotosynthesis and transp iration rate of three Dend robium species p lanted in ten media were tested. The resultsshowed that three Dendrobium species performed great differences in photosynthesis with same culture medium.Photosynthesis rate of Den. chrysotoxum was better than that ofDen. crepidatum ,which was better than that ofDen.trigonopus. There also exists difference in transp iration rate among the three species. The transp iration rate ofDen.crepidatum was the highest, followed by Den. chrysotoxum , and Den. trigonopus was the least. The photosynthesiswas difference in different culture media with same Dend robium species. The best culture medium of Den.crepidatum and Den. trigonopus was orchid stone with the highest photosynthesis of 4. 788 μmol·m-2 · s-1 and2. 640μmol·m-2 ·s-1. The best culture medium ofDen. ch rysotoxum was orchid stone ∶tree bark (1∶1) with thehighest photosynthesis 6μmol·m-2·s-1.
Wood-decay ing Fungion Timber orWooden Constructions in Ch ina( Ⅱ)
ZENG Xiang-wei, CUI Bao-kai, XU Mei-qing, PIAO Chun-gen, LIU Hong-jian
2008, 21(6): 783-791.
Abstract:
Based on literatures, 165 wood-decaying fungi were recorded on timbers or wooden constructions inChina, among them 133 specieswere Basidiomycetes, and 32 were Ascomycetes. 137 species caused white rot, and28 caused brown rot. The rotting type, host, distribution and growth environment were listed for each species. 8species, includingDaedaleopsis tricolor, Fom itopsis pinicola and Hapalopilus f ibrillosus etc. were commonly found onstored logs; 43 species, including species in Gloeophy llum, Hirschioporus, Tram etes and Hypoxy lon etc. , wererecorded on sleepers; 5 species, including Gloeophyllum carbonarium and Daldinia concentrica etc. , werementioned on charred wood; 12 specieswere found in humid environments; Schizophyllum comm une Fr. , Tram etescorruga ta and Da ldin ia concen trica etc. were commonly found on logs for cultivation for mushrooms; 5 species,including Tram etes corrugate, Trichaptum abietinum and Gyrophana lacrym ans etc. , were commonly on woodenconstructions, and the lastmentioned specieswas the most destructive fungus.
The Extraction of Polysacchar ide from WhiteWax Sca le andAna lysis ofMonosacchar ide Compositions
HE Zhao, SUN Long, FENG Ying, CHENG Xiao-ming
2008, 21(6): 792-796.
Abstract:
WhiteWax Scale ( Ericerus pela Chavannes) polysaccharide was extracted with water, and p recip itated byalcohol. The contents of polysaccharide、p rotein and amino acidswere measured. The cap illary zone electrophoresis(CZE) method was developed to separate and identify the monosaccharide composition of white wax scalepolysaccharide. In thismethod, white wax scale polysaccharide was hydrolyzed into componentmonosaccharides andsubsequently derived with 1-phenyl-3-methyl-5-pyrazolone ( PMP) , the concentration and pH of bufferwere studiedand op timized. The results showed extracting ratio of polysaccharide was 2. 4% , content of polysaccharide was256 mg·g-1 content of p rotein was 242 mg·g-1 , the polysaccharide consisted of glucose, mannose, galactose withthe molar ratio of 1∶0. 85∶0. 93.
Transpira tion Var ia tion of the Poplar Shelterbelts and Its Rela tion to theMeteorolog ica l Factors in the Cropland of North China Plain
REN Qing-fu, MENG Ping, ZHANG Jin-song, GAO Jun, LI Chun-you
2008, 21(6): 797-802.
Abstract:
The transp iration of 24-year-old Popu lus tom en tosa. shelterbelts was investigated by Thermal Dissipationsap flow velocity Probe ( TDP) in the crop land of north China p lain from Ap ril to Sep tember in 2007. The variationof transp iration and its relationship to meteorological factorswere studied. The main results are as follows : (1) Thediurnal variations of transp iration demonstrated a single-peak curve in fine and cloudy day in the main growingseason, but in the overcast day, it demonstrated a several-peak at the main growing season. And from Ap ril toSep tember, the average velocity of transp iration per tree were 5. 44, 7. 84, 8. 05, 7. 87, 7. 26 and 7. 17 L · h-1 inthe fine days, 4. 10, 5. 87, 6. 84, 6. 68, 6. 49 and 5. 88 L·h-1 in overcast days, 4. 33, 3. 56, 4. 14, 5. 90, 3. 39 and2. 66 L·h-1 in the cloudy days。(2) The daily variations of the sheltbelt transp iration ( Tr) was characterized withthat it rose gradually in Ap ril, and reaches a peak during aboutMay, June and July, fell down was readily in Augand Sep. In the growing season ( 4—9 ) , the total Tr ( ToTr) was 488. 02 mm, and the ratios of the monthly sheltbelt transp iration to the ToTr was 11. 17% , 18. 71% , 19. 30% , 19. 29% , 16. 66% and 14. 88%. ( 3) In allmonths during the growth season of 2007, the transp iration showed significantly compound correlated with the solarradiation (Ra) , air temperature, air relative humidity and wind speed (α = 0. 01) , and Ra was the most importantmeteorological factor effecting on transp iration through comparing the partial coefficient.
Effects of So ilMo isture on the Ga s-exchange Parameters and Water UseEff ic iency of L on icera japon ica Thunb.
XIA Jiang-bao, ZHANG Shu-yong, ZHANG Guang-can, ZHOU Ze-fu, CHEN An-qiang
2008, 21(6): 803-807.
Abstract:
Little is known about the op timum soil moisture and light intensities for the growth of L onicera japon icaThunb. Using CIRAS-2 portable photosynthesis system, the light responses of photosynthetic and physiologicalparameters of three years old leaves, such as net photosynthetic rate ( Pn ) , Transp iration rate ( Tr ) and water useefficiency (WUE) were thus measured under different soil moisture conditions. The results showed that Pn , Tr andWUE of leaves have critical response to the levels of soilmoisture and the variation of photosynthetic active radiation(PAR). In order to maintain the p lant growing normally and having higher Pn andWUE synchronously, the fittingmasswater content (Wm ) was about 121—206 g·kg-1 , and the fitting PAR was in the range of 600—1 600μmol·m-2 ·s-1. The“op timal high p roductivity and high efficiency water”of Wm was about 172 g·kg-1 , and the op timal PARwas in the range of 800—1 000μmol·m-2 ·s-1. Based on photosynthetic physiological parameters, the soil wateravailability and p roductivity of Lonicera japonica were classified and evaluated. The results showed that on Lonicerajaponica woodland, theWm less than 62 g·kg-1 belonged to“Non-available water”; in the range of 62~90 g·kg-1and more than 234 g·kg-1 , “Low p roductivity and low efficiencywater”; 121—145 g·kg-1 , “Middle p roductivityand middle efficiency water”; 172—206 g·kg-1 , “High p roductivity and high efficiency water”
Research on Apply ing the Pilodyn inWood PropertyBreeding of L a rix kaem pfe ri
WANG Jun-hui, ZHANG Shou-gong, ZHANG Jian-guo, SUN XiaoOmei, ZHU Jing-le, LIANG Bao-song, QI Wan-yi
2008, 21(6): 808-812.
Abstract:
This paper studied the genetic diversity of wood p roperty among 9 families of the living tree of Larixkaem pferi with the indexesmeasured by Pilodyn, a nond estructive tester. The basic density (Dn ) and the outer wood basic density(Do) of the increment core of the wood were also measured in laboratory. Through the analysis ofwood basic density and Pilodyn value, the result showed that the family 34 were the biggest and that of family 32were the smallest in the 9 families of Larix kaem pferi for Pilodyn value ( Pn) , the outer density (Do) and the woodbasic density(Db) . The order of the 9 familieswas similar by Pn ascending sort, Do and Db descending sort. Theresult of the ANOVA analysis also showed that there was the remarkable difference in Pn , Do and Db among the families ( P = 0. 0003—0. 002 8 ). According to the phenotyp ic correlation and genetic correlation analysis of thethree wood p roperties, Pilodyn value ( Pn ) were remarkable negative correlation with outer density (Do )( - 0. 691 8, - 0. 814 2) , Pilodyn value ( Pn) were extremely significantly negative correlation with basic wooddensity(Db) ( - 0. 670 6, - 0. 909 3). The family and individual heritabilities of the Pilodyn value ( Pn) were0. 45 and 0. 28, and the family and individual heritability of outer basic density (Do) were 0. 46 and 0. 33, and thefamily and individual heritabilities of basic wood density (Db) were 0. 43 and 0. 26. Therefore, it was reliable touse Japanese larch Pilodyn value ( Pn ) to rep lace the outer density (Do) and the basic wood density (Db) toestimate the wood density genetic parameters.
Research on Ed ible Bamboo Spec ies Preference ofCaptive Giant Panda s in Qinling
FU Jin-he, LIU Ying-ying, JIN Xue-lin, MA Qing-yi, ZHAO Peng-peng
2008, 21(6): 813-817.
Abstract:
During its long historical, the giant panda has formed a highly specific feeding behavior, with bamboosand alp ine bamboos forming its p rimary source of food. Referring to the bamboo resource in Qinling, The authorsstudied the edible bamboo species to find the p references of cap tive giant pandas. From the study, itwas found thegiant pandas had a wider selection of feeding bamboo species. The significance test of difference showed that thegiant pandas ate the feeding bamboo species selectively. Further, Forage ration indexwas used to analyze the ediblebamboo species p reference of giant pandas. This included Preference, Avoidance and Random.
Effect of PulsedMagnetic Field on the Growth, Physiolog ica l andBiochem ica l Character istics of P inus m asson iana Ca llus
LIANG Jun, NING Shao-hua, WANG Zhen-chao, ZHANG Xing-yao
2008, 21(6): 818-824.
Abstract:
The present research used Pinus m asson iana callus as the experiment material. P. m assoniana calluswere treated with different pulse rise time and treating time, then the growth condition of P. m assoniana calluswasobserved, the exterior shape, the content of soluble p rotein and soluble sugar and the activity of p rotective enzymesof P. m assoniana calluswere also been discussed. The experiment results were as follows: (1) After treated withpulsed magnetic field, the fresh weight of P. m assoniana callus increased obviously compared with the controlgrouP. The trend of its development was increasing slowly then decreasing sharp ly. ( 2) The treatment of pulsedmagnetic field on the P. m assoniana callus could increase the contents of soluble p rotein and soluble sugar. Andthose parameters increased to the highest level at the pulse rise time of 5 ms and treating time of 8 h. (3) Aftertreated with pulsed magnetic field, the activity of p rotective enzyme system comp rised of peroxidase ( POD ) , superoxide dismutase ( SOD) , catalase (CAT) increased with the imp rovement of pulse rise time and treating time.The activities of POD, SOD, CAT increased to the highest level at the pulse rise time of 5 ms and treating time of8 h and then decreased with different degree. (4) At a certain pulse rise time and treating time, the cellmembraneof P. m assoniana callus could still maintain a relatively strong stability, indicating that cells of P. m asson ianacallus had a certain resistance and endurance against pulsed magnetic field.
Study on Molecular Identif ica tion and Genetic Rela tionships ofEctomycorrhiza l Stra ins of Su illus Gene
FENG Jin-xia, WANG Ming-jie, YAN Wei
2008, 21(6): 825-831.
Abstract:
The molecular identification and genetic diversity of 27 Su illus strains isolated from InnerMongolia werestudied based on the sequencing analysis of ITS, the internal transcribed spacer region of the ribosomal RNA genes,and ITS-RFLP for the first time. ITS sequences of 27 Suillus strainswere subjected to a GenBank search and SP1,SP2, SP3, SP4, SP5, SP6, SP7, SP8, SP9, SF1, SF2, SF3, P. Lac-1, P. Lac-2, 3′, 3″, 3# were belonged to Suillus lu teuswith 99% similarity to DQ440568. 1 in GenBank. These S uillus strains were classified into 3 genotypes. The greatgenetic distance of“zhang2”and 1″from others might be the results of the influence by its hosts and habitats.Although sequence analysis of ITS was accurate, the ITS-RFLP was simp le and p ractical and might be useful to thequick identification of ectomycorrhizal fungi. It was more effective and accurative for using these two techniquescombination.
Algor ithm of Or ienta tion and Standardiza tion on SpiculeMorpholog ic Imageof Bursaphe lenchus ( Nema toda: Aphelencho ididae)
MAI Shu-rong, CHEN Xiao-ling, ZENG Wen-cai, FANG Yu-sheng
2008, 21(6): 832-836.
Abstract:
Arithmetic of minimum enclosing rectangle (MER ) and image mirror transformation of digital imagep rocessing and analyzing technology were app lied to intelligence alternate on orientation and standardization ofSp iculeMorphologyDiagnosis of B ursaphelenchus, which was brought out by computer p rogram on Visual c++. Thecorrect results were achieved by running the p rogram based on the data of sp icule morphologic image of 66 validspecies of B ursaphelenchus.
Investiga tion on Ma in Trees Spec ies Damaged by Ice Storm inGuangxi and the Restora tion Mea sures
CAI Zi-liang, ZHONG Qiu-ping, LIU Qing-yuan, BAI Ling-hai
2008, 21(6): 837-841.
Abstract:
By field investigation on the damaged forests in Guangxi ice storm disaster area, the relationship betweenforest disaster and some factors such as tree species, slope aspect, altitude. The results of investigation showed thedisaster tolerance ability of various tree species followed the order of Cam ellia oleifera > Illicium verum >Cunningham ia lanceolata > Pinus m assoniana > Euca lyptus > Phyllostachys pubescens, and the tolerance ofindigenous specieswere stronger than that of foreign species. The influence of altitude on disaster degree showed anS2shaped curve, the disaster became heavier with the height of altitude, the disaster was heavier in shaded slopethan in sunny slope, and in pure forests than in mixed forests. Itwas found that the p ine tree after resin-tapped wasdamaged heavier than thatwithout tapped. Based on investigation, the authors suggest: (1) to selected tree specieswith stronger cold-resistance and stress-tolerance; ( 2) to develop indigenous tree species; ( 3) to develop mixedforest; (4) reasonable allocating and management; (5) to take necessary restoration measures.
Eva lua tion of Cold Tolerance of Three Acac ia Species
ZHANG Wei-hua, ZHANG Fang-qiu, XU Da-ping, ZHANG Shou-gong, CHEN Zu-xu, HU Cai-yan
2008, 21(6): 842-846.
Abstract:
This paper evaluated the ability of cold resistance of three Acacia species coming from south subtrop icalareas and sequenced the cold resistance of the p rovenances on the basis of electrical conductivity. The resultsshowed that there was very significant diference for cold tolerance among the three Acacia species and theirp rovenances. The sensitizing range of low temperature for A. m ang ium. was 6 ℃, and 3 - 0 ℃ for A. au riculaeform is and A. crassicarpa. The strongest p rovenances of A. m angium, A. auriculaeform is and A. crassicarpa were17703, 19244, 17562 or 16598.
Study on Dwarf Effects of Seed Soaking with Plant GrowthRetardants on M use lla lasioca rpa
LUO Dong, WANG Yan, LIU Xiu-xian, LI Zheng-hong, TIAN Jie, WAN You-ming
2008, 21(6): 847-851.
Abstract:
The effect of plant growth retardants on seeds germination, seedling growth and photosynthetic characteristicswas tested by soaking M usella lasiocarpa seeds with p lant growth retardants ( PP333 , S3307 , CCC) for 24 hours.Results indicated that 10—40 mg·L-1 PP333 , 2—8 mg·L-1 S3307 soaking can delay the germination, decreasebiomass accumulation, reduce p lant height, furthermore increase chlorophyll content and enhance photosyntheticrate. The dwarf effect of 40 mg·L-1 PP333 was the most notable, the p lant height clearly descended by 51. 8%compared with the contrast; CCC soaking can also delay the germination, enhance photosynthetic rate but increasebiomass accumulation in certain degree. 5 000—7 000 mg·L-1 CCC soaking significantly delayed the germination,reduce p lant height. The dwarf effect of 7 000—10 000 mg·L-1 CCC soaking was not obvious, but significantlyincreased the chlorophyll content. Comparatively speaking, the dwarf effect of PP333 and S3307 on M usella lasiocarpawere better than that of CCC. Compared with PP333 , the dosage consump tion of S3307 was much smaller when thesame control levelwas obtained. S3307 wasmore suitable forM usella lasiocarpa seed soaking from the perspectives ofdwarf effect, photosynthesis and economy.
Study on In itia l Identif ica tion and Stability of Natural Pigmentof C itrus changshan-huyou
SHI Hai-xiang, ZHONG Shan-min
2008, 21(6): 852-856.
Abstract:
Initial identification and the effects of pH, temperature, light, metal ions reducing and oxidant onstability of natural p igment, which was extracted by supercritical CO2 extraction from Citrus changshan-huyou wasstudied. The results showed that the p igment was flavonoids, By NaNO2-Al (NO3 ) 3 colorimetric method forquantitative analysis, the flavonoidswas 2. 01 g·L-1 ; the p igment in alkaline and neutral solution wasmore stablewhile in acidic solution the stability was unstable; the light, heat and oxidant could damage the stability; it wasstable under reducing; low concentration of Na+ would increase the maximum absorbance, high concentrations ofNa+ would reduce the maximum absorbance. With the increase of concentration of Zn2+ , the color of p igmentobviously smeared out. The sharp decline in absorbance; Ca2+ , Cu2+ had basically the same impact on the trend.When the concentration was less than 0. 05 mol·L-1 , the residual p igment showed a slow rate of decline, when itwasmore than 0. 05 mol·L-1 , the rate of residual p igment increased in a low amp litude, Mg2+ would diminish therate of residual p igment.
Differences in Uptake and Tolerance to Cadm ium in Var ieties of Sa lix in tegra
YANG Wei-dong, CHEN Yi-tai
2008, 21(6): 857-861.
Abstract:
W illows (Salix spp. ) have been p roposed for use in phytoremediation technology. Three varieties of Salixin tegra in hydroponic experiments for theirmetal resistance and accumulation were investigated. Plantswere exposedfor 6 weekswith 0μmol·L-1 , 10μmol·L-1 , 50μmol·L-1 CdCl2 , measurements of growth parameters havebeen combined with Cd concentration in shoots and roots. Plant biomass, metal tolerance and Cd accumulationpattern in shoots and roots varied among varieties. Shoot growth and number of lateral roots were significantlyreduced under cadmium treatment, 10μmol·L-1 and 50μmol·L-1 CdCl2 treatments reduced the dry biomass ofshoots and roots, Elevated Cd concentration in medium decreased Cd transport from roots to shoots in all varieties.The leaf∶root ratios for Cd in all varietieswere 1, the ratios of total amount of Cd decreased with Cd level in the medium. Tolerance Index ( TIroot ) of S. integ ra‘Weishanhu’variety was 0. 61—0. 82, S. integ ra‘Dahongtou’variety had a TIroot of 0. 88, TIroot of S. integ ra‘Yizhibi’was about 0. 92—0. 93. These results showed that S alix in tegra has the potential to be used forphytoextration of Cd in moderately contaminated soil.
Study on Physica l andMechan ica l Properties of Phoebe bou rneiWoodfrom Planta tion and Na tura l Forest
JIANG Xiang-mei, XIAO Fu-ming, GONG Bin, YE Jin-shan
2008, 21(6): 862-866.
Abstract:
Based on studying the physical and mechanical p roperties of Phoebe bournei wood from p lantation andnatural forest, the results showed that the air-dry density and oven-dry density of P. bourneiwood from natural forestwere 0. 721 g·cm-3 and 0. 680 g·cm-3 , that from p lantation were 0. 572 g·cm-3 and 0. 535 g·cm-3. Thedifference of wood density between natural forest and p lantation was extremely significant, but the wood densityvariation coefficient of p lantation was less than that of natural forest. The wood volume shrinkage ratio of P. bou rneip lantation and natural forest under air-drying condition were 4. 935% and 6. 439% , while under oven-drycondition, they were 9. 330% and 11. 376% respectively, which meant that the dimensional stability of wood fromP. bournei p lantation was poorer than that from natural forest, but their ratios of tangential to radial direction were1. 75 and 1. 76. The rigidities of P. bournei wood from natural forest in surface, radial and tangential directionswere 7 583 N, 6 183 N and 6 625 N respectively, which was higher than that from p lantation. P. bou rnei naturaland p lantation wood veneer rotary cutting back cracking rate were 53% and 67% and their veneer thicknessdeviation were 0. 09 mm and 0. 08 mm. It was p roved that the p roperties and quality of P. bournei wood fromplantation and natural forest were similar.
Study on Culture Media for Micropropagation of Oplopanax elatus Nakai
GU Di-zhou, ZHU JunOyi, JIANG Yun-tian, ZHOU You
2008, 21(6): 867-870.
Abstract:
Taking the tender leaves ofOplopanax elatus as exp lants for the experiment, Uniform Design were used totest the most suitable media for callus induction, differentiation of shoot and rooting. The results showed thatN6 +6-BA 0. 5 mg·L-1 + 2, 4-D 0. 2 mg·L-1 +Vc 10 mg·L-1 was fitted for callus induction, the medium fordifferentiation of shootwas N6 + 6-BA 4. 5 mg·L-1 +NAA 0. 1 mg·L-1 +Vc 20 mg·L-1 , the medium forrooting was 1 /4MS + IBA 0. 1mg·L-1 +NAA 0. 1 mg·L-1. Tissue culture required different kinds of culturemedia in different phases.
Study on Mixed Cuttage of Sabina ch inens is with Rosa ch inensisand Euonym us japon icus
LEI Shu-hui, PEI Shu-lan, LEI Bin
2008, 21(6): 871-874.
Abstract:
The effects of three cuttagesmethods of Sabina chinensis using three media on survival rate were studied.The results showed that: the survival rates of the mixed cuttages (S abina ch inensis with Rosa chinensis or Euonym usjaponicus) were better than that of single-species cuttage (Sabina chinensis) , among them the survival rate of themixed cuttage (Sabina chinensis with Rosa chinensis) was better, which could reach 76. 8%; among three media,the survival rate in ash the highest, followed by sand and nursery soil. The survival rate ofmixed cuttage of Sabinachinensis with Rosa ch inensis in the ash was the highest (87. 3% ).