不同坡向对栓皮栎耗水规律的影响

利用热扩散探针配合自动气象站,于2004年度在北京林业大学妙峰山试验林场对不同立地条件下栓皮栎的水分运移规律进行了研究.结果表明：栓皮栎水分运移规律受天气状况和立地条件的影响很大.在晴天,阳坡的液流峰值达到0.007 cm/s,是阴坡液流峰值0.001 5 cm/s的5倍;在阴天,阳坡栓皮栎的液流峰值为0.000 2 cm/s,而阴坡为0.000 3 cm/s,坡向的影响减小.林木的耗水量受到树种本身的遗传因素和外界气候因子的制约,其中太阳辐射、大气温度、风速与液流呈正相关,空气相对湿度、土壤温度对液流的影响表现为负向相关.

Effect of site types on water consumption of Quercus variabilis stands

In 2004,TDP(Thermal Dissipation Sapwood Flow Velocity Probe)and Auto-Meteorological Station were applied to study the rule of sap flow fluctuation of different plots in Miaofengshan Forest Research Station of Beijing Forestry University.The results obtained were as follows: Firstly,sap flow fluctuation was obviously affected by the weather and site types.In sunny days,their maximum was up to 0.007 cm/s,0.003 cm/s,respectively;while in rainy days,the sap flow peak height of south-facing slope was 0.0003 cm/s,and of north-facing slope was 0.0015 cm/s.Further more,the influence of slope direction reduced. Secondly,the water consumption of tree species was restricted by its inherent causes and the external climate factors,and solar radiation intensity,air temperature,wind speed presents the coherent current with the rule of sap flow velocity but relative humidity and soil temperature shows the opposite correlation.