A Study on the Stem Sap Flow of Ind ividualTrees of Populus simonii underD ifferentWeather Conditions in Rainy Season in Guanting Reservoir

GUAN Wei; YE Bing; WANG Yan-hui; LIU Li-bing; TIAN Yu-zhu

By using themethod o f heat pulse ve loc ity recorder and w atch dogw eather station, the sap flux density ofindividual trees ofPopulus simonii under d ifferent w eather cond itions in ra iny season w asm easured and its re lationsh ip w ith environmenta l factors w as ana lysed in Shangx inzhuang Research Station fo r So il andWaterConservation ofGuanting Reservoir, wh ich located in Yanqing Coun ty, Be ijing. The results show ed that the sap flow varied regu larly w ith w eather conditions in day time and in seasons. The sap flow started at 5:30- 6:30, and ascended to thepeak during 12:00- 13:00, then began to decrease at 16:00 and slow ly decrease since 20:00. It arrived at thelow est point at the time before the sun rises in next day. There w ere sign ificant posit ive re lationships betw een theda ily accumulated sap flux( SFA ) and some diurnalmeteo ro log ical or so il env ironment factors, such as sun rad iation( ESR ), air temperature ( Ta ), and relat ive a ir hum id ity ( RH ). The re lationsh ip betw een SFA and so ilmo isture in the layer o f 0~ 40 cm ( Sw40 ) w as a sign ificant and negative one. The ir reg ression equat ion w as SFA = 69. 7 +5??63ESR + 3. 12Ta + 0. 239RH - 1. 13Sw40 (R = 0. 752).

1. R esearch Inst itute of Fores tEcology, Environment and Protect ion, CAF, Beijing 100091, Ch ina

2. R esearch Inst itute of Fores try Pol icyand In formation, CAF, Be ijing 100091, Ch ina

3. So il andW ater Conservation Station inY anq ing County, Beijing 102100, Ch in a

4. Water Resource Bureau of Yanq ing County, Beijing 102100, China

Received Date: 2006-09-15

Abstract: By using themethod o f heat pulse ve loc ity recorder and w atch dogw eather station, the sap flux density ofindividual trees ofPopulus simonii under d ifferent w eather cond itions in ra iny season w asm easured and its re lationsh ip w ith environmenta l factors w as ana lysed in Shangx inzhuang Research Station fo r So il andWaterConservation ofGuanting Reservoir, wh ich located in Yanqing Coun ty, Be ijing. The results show ed that the sap flow varied regu larly w ith w eather conditions in day time and in seasons. The sap flow started at 5:30- 6:30, and ascended to thepeak during 12:00- 13:00, then began to decrease at 16:00 and slow ly decrease since 20:00. It arrived at thelow est point at the time before the sun rises in next day. There w ere sign ificant posit ive re lationships betw een theda ily accumulated sap flux( SFA ) and some diurnalmeteo ro log ical or so il env ironment factors, such as sun rad iation( ESR ), air temperature ( Ta ), and relat ive a ir hum id ity ( RH ). The re lationsh ip betw een SFA and so ilmo isture in the layer o f 0~ 40 cm ( Sw40 ) w as a sign ificant and negative one. The ir reg ression equat ion w as SFA = 69. 7 +5??63ESR + 3. 12Ta + 0. 239RH - 1. 13Sw40 (R = 0. 752).

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Reference (17)

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A Study on the Stem Sap Flow of Ind ividualTrees of Populus simonii underD ifferentWeather Conditions in Rainy Season in Guanting Reservoir

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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