北京山区造林树种耗水规律初探

Primary Studies on Water Consumption of Man-made Forest in Mountain Area in Beijing

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的油松、侧柏、栓皮栎等树种的水分运移规律进行研究。结果表明:不同树种之间、以及同一树种在不同的立地条件下的水分运移规律有很大差异;林木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关系;不同树种间耗水量为:阳坡栓皮栎>阴坡栓皮栎>油松>侧柏。

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 plot in Miao-fengshan Forest Research Station of Beijing Forestry Uni- versity. The results obtained were as follows： Firstly, there were much difference in various tree species or the same species but not the same spaces. Secondly, The water consumption of tree species was restricted by its inherent causes and the external climate factors, and solar radiation intensity,atmosphere temperature, wind speed presented the coherent current with the rule of sap flow velocity but relative humidity and soil temperature showed the opposite current. Finally, the sort order of,tree specices water consumption was ; Q. variabilis（sunny slope） 〉 Q. variabilis（overcast slope） 〉 Pinus tabulaeformis〉 Platycladus orientalis.