生长季内官厅库区小叶杨单株树干液流通量密度的研究
A Study on the Stem Sap Flow of Ind ividualTrees of Populus simonii underD ifferentWeather Conditions in Rainy Season in Guanting Reservoir
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摘要: 利用热脉冲液流仪和微型自动气象站, 在北京市延庆县上辛庄水土保持站观测研究了雨季不同天气条件下官厅库区的小叶杨树干边材液流通量密度变化规律及其对环境因子(气象条件、土壤水分) 的响应。结果表明, 边材液流通量密度曲线在不同天气条件下均具有明显的昼夜变化规律: 液流通量密度通常于清晨5：30－6：30时开始上升; 12：00 13：00时达到峰值; 16：00时开始持续下降, 20：00时下降速度变慢, 至次日日出之前达到低谷。日液流通量密度( SFA)与日太阳辐射量( ESR)、日均空气温度( Ta )和日均空气相对湿度( RH )均存在极显著正相关关系,与日均0~ 40 cm 土层蓄水量( Sw40 )存在极显著负相关关系, 经回归分析建立了日液流通量密度与各环境因子的线性关系: SFA = 69. 7 + 5. 63ESR + 3. 12Ta + 0. 239RH - 1. 13Sw40 ( R = 0. 752)。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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Key words:
- Populus simonii
- / heat pu lse
- / sap flux density
- / meteorolog ical facto rs
- / Guanting reserov ir
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