• 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

2006 Vol. 19, No. 1

Display Method:
A Discussion on Forest Management Method Optimizing Forest Spatial Structure
HU Yan-bo, HUI Gang-ying
2006, 19(1): 1-8.
Abstract:
An important directionof forest management is to develop an optimal management plan based on analysis of spatial structure. In this research, a new method using spatial structure parameters was developed for forest management. The management targe is the spatial structure of climax pattern or the model stand. According to the rule of the progressive succession , the most important thing in forest management is to adjust distribution pattern of trees, species compositionand competitive relationships among trees, hence to promote the progressive succession.
Study of Fruit Growing Specialties and Its Oil Content in Oil-Tea Camellia
CHEN Yong-zhong, XIAO Zhi-hong, PENG Shao-feng, YANG Xiaa-hu, LI Dang-xun, WANG Xiang-nan, DUNAG Wei
2006, 19(1): 9-14.
Abstract:
On the marked plants of the Oil-Tea camellia (Camellia oleifera) fine variety "Xianglin 4" , the mechanism of the oil formation and transformation were explored by the analysis of the fruit growth and their oil contents. The results showed that the fruit sizes increased sharply from the mid of June to the end of July, while the fruit weight increased by 2/3 of the all in two growing season, from the mid of June to the end of July and from the mid of September to harvest. There were two increasing peaks though the oil content of the seed pip, the fresh seed and the fresh fruit increased along with the fruit growth, from the mid of August to harvest except for in the mid of September. 68.9% of the oil content of fresh fruit increased from the last month (September 20 to October 20) , indicating that oil yield of the Oil-Tea camellia should be a great loss only if the fruit were harvested before ripeness.
Contents of Anti-cancer Active Component in Plant of Taxus yunnanensisfrom Southeast Tibet
SU Jian-rong, ZHANG Zhi-jun, CHEN Zhi-yong
2006, 19(1): 15-20.
Abstract:
The samples of Taxus yunnanensis from southeast Tibet were collected. The anti-cancer component contents in plant of Taxus yunnanensis such as taxol, baccatin Ⅲ, 10-deacetylbaccatin Ⅲ, cephalomannine, 10-deacety-7-epi-taxol and 7-epi-taxol were analyzed by HPLC. The result indicated that the correlation coefficients between of taxol and 7-epi-taxol, 7-epi-taxol and baccatin Ⅲ were 0. 852 and 0. 827. Their positive correlation was markedly in the 0. 001 levels. The correlation coefficient between taxol and baccatin Ⅲ was 0. 716. Their positive correlation was markedly in the 0. 05 levels. The contents of taxol had a significantly correlation with 7-epi-taxol. The contents of 7-epi-taxol had a significantly correlation with baccatin Ⅲ. The regression coefficients between taxol and 7-epi-taxol, 7-epi-taxol and baccatin Ⅲ were 0. 852 and 0. 827. The contents of taxol in 3 years old shoots and 1 year old needles were significantly different at 0. 05 levels. The contents of taxol in barks and 1 year old needles, 3 years old shoots and 1 year old needles were not significantly different at 0. 05 levels.
Result on Geographical Provenance Trial at Young Fokienia hodginsii Stand in Hunan
HOU Bo-xin, LIN-feng, YU Ge-fei, ZHANG Xin-hua, TAO Shen-mian
2006, 19(1): 21-26.
Abstract:
The heredity variability of the height, diameter and volume growth, interaction effect between biomass and circumstance, relativity among characters, age and seedling growth of a 4 5 years old forest in 17 geographical provenances and 48 families in Hunan were studied. The results indicated there were obvious differences in the height, diameter and volume growth at mountainous, semi-mountainous and hilly areas. Heritabilities of the height, diameter and volume were 0. 556 1 - 0.903 4, 0.630 3 - 0.914 0, 0.670 1 - 0.914 3 respectively. For the interaction of provenances and environment , the rank of the height, diameter and volume growth was mountainous area > semi-mountainous area > hilly area. Based on the selection standard on the volume growth exceeded (15%) of average provenances, 10 superior provenances and 14 families were tentatively selected with the genetic gain of 16. 09% - 88. 70% , 15. 19% - 184. 80% respectively and could be afforested in different ecological environments.
Effects of Site Management Treatments on Growth of 5-year-old, Second-rotation Chinese Fir Plantations
FAN Shao-hui, HE Zong-ming, LU Jing-ming, Pan Rui-min, YANG Xu-jing
2006, 19(1): 27-31.
Abstract:
The effects of five different site management treatments on productivity of 5-year-old, second rotation Chinese fir (Cunninghamia lanceolata)plantations planted after harvesting a 29-year-old, first rotation Chinese fir plantation in Xiay-ang State Forest Farm, Nanping, Fujian Province, were studied. The results showed that the Chinese fir stand grew the best with the treatment BL3(stem and bark harvest, double slash) , followed by the treatment SB (stem and bark harvest, slash burning) and the treatment BL2(stem and bark harvest, no slash burning) , and the poorest with the treatment BL1 (whole tree harvest) and the treatment BL0(all aboveground organic residue removed). Differences in tree growth among different treatments were not statistically significant, except for difference in tree height between BL3 and BL1.
A Preliminary Study on Karyotype of Kerria ruralis Wang
CHEN Hang, CHEN Xiao-ming, FENG Ying, YE Shou-de
2006, 19(1): 32-38.
Abstract:
Multicolor phenomenon is a special rule in heredity of Kerria ruralis. Karotype of female in two styles is preliminarily reported in this paper. 18 chromosomes are composed of 8 metacentric chromosomes and 10 terminal chromosomes. The two styles share the same karotype formula and type of chromosomes while differences in the shapes of chromosomes exist. Using the t-test to analyze the six karyotypic parameters (arm ratio, centromere index, relative length index,etc.) between the two color styles, the result showed that the differences were not distinct. The karotype formula is: Ky(2n,(?)) = 18 = 8m + 10T = 4L + 4M2 + 4M1 + 6S.
Soil Hydrological Characteristics of Water Conservation Forest in Qilian Mountains
DANG Hong-zhong, ZHOU Ze-fu, ZHAO Yu-sen, YANG Hong-xue
2006, 19(1): 39-44.
Abstract:
On the base of surveying and analyzing soil water physical characteristics of 5 main soil types of water conservation forest and grassland in Qilian Mountains, the water-holding capability and infiltration rate of soil layer were measured. Meanwhile, the water content loss equation and water potential equation were modeled too. It indicated: forest soil had low bulk weight which were all less than 1 g ?cm-3 , with high infiltration rate and high water-holding capability, although there existed marked difference among them which could be ranked in the order of moss-Picea crassifolia, sub-alpine shrubs, shrub-Picea crassifolia, mid-low-mountain shrubs, Sabina przewalskii and grassland. The water-holding capability of Grey-drab forest soil was higher than that of Castanozem grassland soil in the same environment condition (water loss for e-vaporation) , the water loss curve of the former shaped in protruding and the latter was reversely, but the availability of soil water of the latter was higher while there were same water content level, and that played a more significant role to the life of forest especially in water deficient period.
Transpiration Rule of Pinus sylvestris var. mongolica and Its Relation to the Canopy Micrometeorology in Mu Us Sandy Area
ZHANG Jin-song, MENG Ping, SUN Hui-min, ZHOU Ze-fu, YU Yan-feng
2006, 19(1): 45-50.
Abstract:
The transpiration rule of Pinus sylvestris var. mongolica and its relation to the canopy micrometeorology were analyzed through the experimental data of the tree sap flow and the canopy micrometeorology, which were measured by thermal dissipation sap flow velocity probe and CR10X automated meteorology system at a 10-minute recording interval respectively. The trees were 20 years old. The experiment was conducted in Mu Us sandy area during the main growing season (Apr. - Sep.) of 2004. The main results are as follows: The diurnal variations of the tree transpiration were demonstrated several-peak curve in cloudy day, but single-peak curve in the overcast day , and single-peak curve in clear day except Sep. The total transpiration of the main growing season was 1 143. 7 mm , the average daily transpiration was 6. 25 mm and monthly transpiration accounted for 10. 76% , 13. 62% , 14. 05% , 24. 56% , 19.47%,17.52% in Apr. ,May,Jun . , Jul . , Aug . , Sep . , respectively. The transpiration per tree was significantly (a=0. 01) related to the canopy solar radiation (Ra) , air temperature, relative humidity, and wind velocity in the main growing period and Ra is the most important micrometeorological factor effecting transpiration in the main growing season of the tree by comparing the partial correlation coefficient.
Several Factors Affecting Accumulation of Flavonoids in Suspension-cultured Cells of Ginkgo biloba
FANG Jian-jun, QUE Guo-ning, HAN Yi-fan
2006, 19(1): 51-53.
Abstract:
The cell suspension culture system was established for producing flavoniods by using stem of young seedling as ex-plants. A study was made on the phase of cell growth and relative changing amount of flavonoids, as well as the activity of L-phenylalanine ammonia-lyase (PAL) (EC 4. 3.1.5). It was showed that the flavonoids accumulation increased in the exponential phase of cell growth, and reached the highest on the 15th day after culture. The activity of PAL increased during this period. PAL activity doubled in response to transferring suspension-cultured cells into new medium. In cell suspension cultures, growth in the dark, but not in light-growth cultures, PAL activity was induced up to 12 times by UV-light.
Photosynthetic Physio-response of Taxodium ascendens Seedlings to Different Soil Water Gradients
LI Chang-xiao, ZHONG Zhang-cheng
2006, 19(1): 54-60.
Abstract:
Upon simulation of soil water change of hydro-fluctuation belt in Three Gorges Reservoir Area, four different kinds of water treatment were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings under the environment of hydro-fluctuation belt. Four kinds of water treatment were normal growth water condition (CK) , light drought stress (T1) , soil water saturation (T2) and soil submersion (T3). The results showed that different water treatments could effectively influence the content of photosynthetic pigment, leaf gas exchange and apparent resources use efficiency of Taxodium ascendens seedlings. It was also demonstrated that the Taxodium ascendens seedlings could not only tolerate water submersion and wet condition but also endure a certain degree of drought. To establish protection forest system of hydro-fluctuation belt in Three Gorges Reservoir Area, the species Taxodium ascendens was suitable to be planted in conditions of root submersion or saturation soil water. In case planted in drought soil condition, this tree species should be watered appropriately in order to keep its normal net photosynthetic rate.
Provenance Differences of Seedling Shoot Elongation Parameters in Schima superba
ZHANG Ping, ZHOU Zhi-chun, JIN Guo-qing, WANG Yue-sheng, WANG Hui
2006, 19(1): 61-65.
Abstract:
The periodicity of seedling shoot elongation in Schima superba was observed to illustrate provenance differences of growth parameters such as maximum growth rate (MGR) , linear growth rate (LGR) , total linear growth (TLG) and linear growth day (LGD) by using logistic curve function. The result showed that the seedling shoot elongation in Schima superba was preferably fitted by logistic curve, whose determinant coefficients were more than 0.92. There are significant differences among provenances and provenances zones for three biological parameters of logistic equation (a,b,c) and four seedling shoot elongation parameters (MGR, LGR, TLG, LGD). MGR, LGR and TLG were found to be negatively related to the latitude of provenance and appear a classical latitude cline variation pattern. The variation for three parameters above was mainly derived from provenances (42.84%-43.41%) and provenance zones (11.07%-13. 15%). LGD seemed to be not related to the longitude and altitude of provenance. The differences among both provenances and provenance zones were small for LGD. Correlation analysis demonstrated that the increase of TLG was attributed to the acceleration of MGR and LGR, but the prolongation of LGD.
Study on the Ratio of Hosts and Wasps When Mass Rearing of Chouioia cunea Yang
WEI Jian-rong, SHU Zhi, WANG Chuan-zhen, QU Hua-rong, YANG Jim, MEN Fang-lai
2006, 19(1): 66-69.
Abstract:
The choice of best ratio of host and wasps when mass rearing of Chouioia cunea was studied. The result showed that 1: 1 or 1: 2 were the choice of the ratio of hosts and wasps when choosing fall webworm as a host and 1: 50 when choosing Antheraea pernyi as a host to mass rearing C. cunea. The longevity of C. cunea reared according to this ratio was about 6 days on average in field, which could guarantee them to find suitable hosts. To improperly increase the percent of wasp would have a bad influence on the quantity or ratio of female and male of next generation.
Effect of Air-drying on Vigor of Melia toosendan Seedlings in Dry-hot Valley of Jinshajiang River
ZHANG Chun-hua, LI Kun, CUI Yong-zhong, XEI Zheng-lun, YANG Wen-sheng, SHI Yong-ze
2006, 19(1): 70-74.
Abstract:
Studies of 5 kinds of air-drying treatments were conducted on Melia toosendan Sieb. et Zucc. The water content, relative electric conductivity, root vigor and survival rate after planting were tested. The relationship between seedling water and seedling vigor was discussed. The result showed that the seedling vigor of Melia toosendan was related closely with its water content. The seedling dehydration caused the increase of the relative electric conductivity of root system and the decrease of the relative water content and the root vigor. Eventually, the survival rate decreased. So seedling vigor conservation of Melia toosendan is one of the key factors that affect field performance.
Study on Callus Induction and Brown Stain Prevention Techniques of Some Sympodial Bamboo Species
GU Xiao-ping, SU Meng-yun, YUE Jin-jun, WU Xiao-li
2006, 19(1): 75-78.
Abstract:
The stem tops and stems with node of young bamboo of Bambusa ventricosa,B. multiplex cv. Fernleaf and B. multiplex were used to study the callus induction and brown stain control. The results showed that among three regulator combinations(2,4-D KT and IBA) ,2,4-D(2-3 mg·L-1)treatment was the best with the highest callus induction rate,most of the explants induced callus and grew well. 2,4-D(2 mg·L-1) + KT(0. 5 mg·L-1) treatment could induce callus from stem parts while the callus induced from the stem top was water-soaked and easy to be brown stained. KT(4 mg·L-1) treatment could induce callus on some stems but was easy to be brown stained. KT(4 mg·L-1) + IBA(0. 5 mg·L-1) treatment could induce callus but they grew very slowly. The effect of adding anti-oxidant was better than adding adsorbent in controlling brown stain of callus. The ability of brown stain control is in the order of ascorbic acid(5 mg·L-1) > cyste-ine(100 mg·L-1) > activated carbon(1 g·L-1) . By adding ascorbic acid(5 mg·L-1) in culture media,the brown stain rates of stem top and middle part of Bambusa ventricosa, B. multiplex, var. nana and B. multiplex reduced by 51. 3% , 43. 3% ,36. 8% and 62. 7% ,42. 7% ,30. 8% respectively compared with that of the control. Soaking explants in non-bacteria water or cysteine(100 mg·L-1)for 2 to 4 hours would benefit controlling the brown stain. Culturing in dark would benefit the growth of callus and control of brown stain.
Study on Phytoseius yunhangensis , A Natural Enemy of Schizotetranychus bambusae
SHI Ji-mao, YU Hua-xing, YU Jian-xin, HUANG Zhao-gang, ZHENG Jian-guo
2006, 19(1): 79-81.
Abstract:
余杭植绥螨是竹裂爪螨的重要天敌。室内20℃恒温饲养余杭植绥螨需21.2 d完成一个世代、28℃则10.4 d 就可完成,30℃以上出现死亡。幼螨、第1若螨和雄成虫捕食量相对较少,雌成螨每天平均捕食竹裂爪螨5.5头,最多可捕食13头,雌成螨期最多可捕食165头。雌成螨捕食量大,发育即加快,产卵量增加,产卵期延长,卵粒个体也加大。一头雌成螨一生产卵量7-15粒,卵产于竹叶背面基部茸毛丛中或竹裂爪螨的丝网内。余杭植绥螨随竹裂爪螨种群数量的消长而消长,竹裂爪螨在浙江有二个明显的高峰期,其每个高峰期5-7 d后,余杭植绥螨也出现明显的高峰期;而余杭植绥螨每次高峰期后6-9 d,竹裂爪螨发生量就明显下降。
Hyperspectral Approaches for Detecting the Roadside Tree Chlorophyll Content Changes at Branches Scale
SONG Kai-shan, ZHANG Bai, LIU Dian-wei, ZHANG Yuan-zhi
2006, 19(1): 82-87.
Abstract:
Effects of urban communication environment on the chlorophyll content of roadside tree leaves were compared with that of corresponding tree leaves growing in a less polluted environment - Jingyue National Forest Park by analyzing samples collected in both areas. Hyperspectral data of those samples were acquired by using ASD Field NVIR Spectroradi-ometer. The results of analysis showed that:(1) The urban environment could cause serious effects on the chlorophyll content of roadside tree leaves, and deciduous tree leaves responded to this effects intensively while for conifers tree leaves this was not the case. (2) Hyperspectral reflectance and its derivative had intimate relation with the chlorophyll content of sampled roadside tree leaves, and the relationship between chlorophyll content of tree leaves and hyperspectral reflectance and its derivatives varied with the wavelength, in blue and short part and near infrared region of spectrum there was a strong correlation between chlorophyll and reflectance and derivatives, the correlation coefficient was above 0. 83 during 740 - 760 nm. (3) PSSR(the pigment specific simple ratio) index had an intimate relation with chlorophyll content, and a power re-gression model was established with the determination coefficient around 0. 80, which showed that it could be used to detect roadside tree leave chlorophyll content change caused by urban communication environment.
Research on Rhizosphere Soil Properties of Pinus sylvestris var. mongolica with Different Infection Grades
ZHANG Xue-li, YANG Shu-jun, ZHANG Bai-xi, BAI Xue-feng
2006, 19(1): 88-92.
Abstract:
The rhizosphere soil properties of Pinus sylvestris var. mongolica plantation with different infection grades were sludied. The results showed that with exacerbating of disease, the pH value of rhizosphere soil increased and the content of organic matter decreased significantly. CEC values of rhizosphere soil were higher than those in non-rhizosphere soil and varied omplicatedly. The extent of soluble salt accumulation decreased with exacerbating of disease. The accumulation extent of total N, available N, available K and the deficiency extent of available P of rhizosphere soil decreased significantly. The amount of microorganism and the activity of different kinds of enzymes of rhizosphere soil showed a trend of decrease.
The Phonological Investigation and Visual Valuable Analyze of the Urban Landscape Woody Plants in Changbai Mountains
ZHOU You
2006, 19(1): 93-97.
Abstract:
The phenology of 124 urban landscape woody plants in Changbai Mountains district have been studied through the investigation for Tonghua, Baishan, Yanji, Jilin and other 10 cities and countries parks for 2 years. About 50. 81% of the plants investigation had fancy value mainly in flower and only 21 species maily in leaf, and about 46. 77% of the plants had obviously fancy fruits and only 24 species mainly in a type. Flowering at population level mostly lasted from May to July , and fruiting from August to October. Diverse types of fruits could be found in the plants, with drup, berry, pome and capsule having higher percentages. Mature fruits were found in red, black, green and yellow etc. , with red and green fruits prevailing.
Study on the Structure of Culm Form of Bambusa wenchouensis
SU Wen-hiu, GU Xiao-ping, YUE Jin-jun, WU Xiao-li, ZHU Ru-yun, LIN Kai-sou
2006, 19(1): 98-101.
Abstract:
The structure of culm form of Bambusa wenchouensis was studied, including culm height, culm weight, culm taper, wall thickness and internodal length etc. Compared with moso bamboo, the research results showed that if their breast diameters (D) were equal, B. wenchouensis had a higher stem, weightier culm, a little smaller taper and thicker wall, although its wall thickness decreased more quickly than moso bamboo as culm height increases. The best structural model of fresh culm weight (M) was M = 0. 232 7 (DBH)2.189 9, and the relation between its internodal length and culm height could be distributed with conic. When the breast diameter ranges from 4 to 11 cm, internodal length could reach the maximum of 50-65 cm as the node was 10 - 15.
Effects of Age, Type of Auxin and Treatment Concentration on Rooting Ability of Larix leptolepis
MANG Jian-hua, SUN Xiao-mei, WANG Xiao-shan, XU Cheng-li, DING Biao, WANG Xiao-dong
2006, 19(1): 102-108.
Abstract:
Effects of age, type of auxin and treatment concentration on rooting ability of Japanese larch (Larix leptokpis) were systematically studied under mist irrigation on the open field. And general rooting effect for different treatments was e-valualed and the best combinations of auxin type × concentration were selected for different ages of Japanese larch ortet. Based on subordinate function values, the results was evaluated. Once the bests combinations selected are used to treat cuttings taken from test progeny of 12. 5 and 8. 5 years old Japanese larch, 78. 8% and 92. 5% rooting percentage can be obtained , which meant that rooting ability for vegetative propagation of older Japanese larch tree was dramatically improved. Variance analysis of three factors showed rooting ability of Japanese larch was extremely or obviously influenced by age (A) of donor tree, type of auxin (B) and treatment concentration (C). Extremely difference could be found in rooting percentage, root number per cutting, root length and rate of one-side rooting among ages or auxin treatment. There were obvious on extreme difference sparely in rooting percentage, root number per cutting and one-side rooting rate, and the in- teraction effect of three factors (A×B×C) or interaction effects between factors (A×B, A×C and B×C ) also gave extreme influence to most of rooting characters. From results of comparing the treatment of type of auxin and concentration, and interaction effect between them for different age of the donor trees, regular changing in rooting character cannot be fund obviously in this experiment.
Effects of Inoculation with Plant Growth-promoting Bacteria on Bruguiera gymnorrhiza Seedlings
LI Mei, LIAO Bao-wen, KANG Li-hua, ZHENG Song-fa, CHEN Yu-jun
2006, 19(1): 109-113.
Abstract:
A pot experiment was conducted to investigate the growth-promoting effects of inoculation with plant growth-promoting bacteria on Bruguiera gymnorrhiza seedlings, including six phosphate solubilizing bacterial strains (i. e. B. amy, Vib,B. atr,Xan,B. Lie,P. M.) and five nitrogen-fixing bacterial strains (i. e. Au4,Phy ,24S,JA4,cd) . Results showed that: (1) After inoculated with the PSB for six months, the growth of the B. gymnorrhiza seedlings was accelerated significantly. The average height of B. gymnorrhiza seedlings was increased by 21. 57%-9. 54% compared to those of controls, and the biomass was accordingly increased by 27. 49%-20. 32% . The total N and P contents of inoculated seedling leaves were 33.33%-1.35% and 24.42%-2.04% respectively higher than those of controls; (2)The test of significance of difference also indicated that the growth-promoting effects of B. amy and Vib were significantly higher than those of other PSBs; (3) Six months after the inoculation of nitrogen-fixing bacterial strains, the average height of B. gymnorrhiza seedlings were increased by 24.07%-10.22% , and the biomass was accordingly increased by 32.36%-19.71% . The total N and P contents of inoculated seedling leaves were 23. 39%-4.05% and 32. 79%-4. 99% respectively higher than those of controls; (4) The test of significance of difference also indicated that the growth-promoting effects of Au4 and Phy were significantly higher than those of other nitrogen-fixing bacterial strains.
Cotylidia harmandii-A New Corticioid Fungus in China
SHANG Bei, HE Wei, YU Chang-jun
2006, 19(1): 114-116.
Abstract:
A corticioid fungus, Cotylidia harmandii is newly to be reported from China. The specimen was collected from Songshmi Nature Reserve of Beijing. The illustrated description of this species is given here. The distribution and ecology of the species are discussed briefly.
Germination Characteristic and Endogenous ABA,IAA Content Change in the Seed of Abies koreana During Stratifying
SUN Jing-shuang, JIA Gui-xia
2006, 19(1): 117-120.
Abstract:
Abies koreanas seeds, which had a certain dormancy character, were treated by cold stratification to improve germination. The seed germination rates and germination energy were tested respectively to determine the effect of cold stratification (4℃for 1 d、15 d、25 d、40 d). The results showed that the longer the duration of cold stratification , the higher the germination rates and germination energy, and 40-day stratification had the best effect. Endogenous ABA, IAA content in seeds were examined synchronously for different treatments. For unstratified seeds, there are much ABA and little IAA. Following the process of stratification, the content of ABA gradually decreased, while IAA increased. It concluded that endogenous ABA, IAA content in seeds were connected with dormancy and germination of Abies koreana.
Influences of Low Temperature Stress on Camellia Species' Two Physiological Index Related to Resistance to Coldness
WANG Yong-hong, LI Ji-yuan, TIAN min, Geriletu
2006, 19(1): 121-124.
Abstract:
In this paper four species, C. chekiangoleosa, C. grijsi, C. octopetala and C. semiserrata with different cold hardiness were used to determine the electrolyte leakage and MDA content in their leaves after treated with different low temperatures ,1.5℃、-6.5℃、-16℃、- 22℃. Results showed that the plasma membrane permeability became much obviously with the fall of temperature. When the temperature is - 16℃,the electrolyte leakage of C. chekiangoleosa,C. grijsi , C. octopetala increased sharply to 1. 89,1. 33, and 1. 64 times more than that of the - 6.5℃. The electrolyte leakage of C. semiserrata was the most at - 6. 5℃, which was 87.1% more than that of the 1.5℃. MDA content changed regularly with the fall of temperature, raised at first and then declined. When the temperature is - 6.5℃, MDA content of C. semiserrata was the most ,which was 2.42 times of the control ; And when the temperature is - 16℃, MDA content of C. chekiangoleosa,C. grijsi,C. octopetala were the highest and were 75% ,1. 39 times and 1.02 times respectively more than that of the control .
Study on Structure and Combination Techniques of Sand-Stabilization Plants at Sandy Desertified Area
SUN Rong-hua, LIU YU-shan, LIU Zhi-he, SONG Wei-jia, NIU Yue-ying
2006, 19(1): 125-128.
Abstract:
Based on the nature of the Kerqin sand land, the structure and combination techniques of sand-stabilization plants at sandy desertificed area were studied. The results showed that Mongolian sweetvech (Hedysanan mongolicum) was the best plant species for sand-stabilization, followed by yellow willow (Salix gordejevii);the best sand control forest type would be low and dense stand, with 0. 2-0. 3 wind penetration and 20-30 cm in height;the planting depthes of Mongolian sweetvech and yellow willow should be 60 cm and 80 cm; the best season for planting is at autumn (middle or late October) . The ecological sand-stabilization techniques could be extended in 5-30 m height shift sandy dune area in large scale, or at the shifting sandy land with 2% - 4% of water content. By using this ecological sand-stabilization techniques for controlling large sandy dunes, the vegetation coverage could be up to over 80% from 15% after 3 years, with the significant effects of fast controlling, good sandy-stabilization, and sustainable use of stands.