祁连山水源涵养林土壤水分的蒸发性能

通过对祁连山水源涵养林土壤水分的蒸发性能的研究显示：祁连山水源涵养林土壤水分的蒸发受湿度条件、土壤质地及风速的影响较大，且风速(x)和相对蒸发强度(y)之间存在一定的线形关系，即y=3．0507x^0.4835(R^2=O．9702)，说明风速加大，蒸发力加强，大大促进了这一地区的土壤蒸发过程。因此，如何做好春季林地保墒，保持林木生长所需的土壤水分问题在祁连山区变得至关重要。同时指出，土壤蒸发量的确定对掌握祁连山区水量平衡状况、评价水资源及其合理利用，也对了解土壤对植物的供水性能有着重要的意义。

EVAPORATION CAPABILITY OF SOIL MOISTURE IN WATER RESOURCES CONSERVATION FORESTS OF QILIAN MOUNTAINS

The evaporation of soil moisture of water resources conservation forests is influenced considerably by humidity, soil texture and wind speed; Furthermore, there exists a definite linear relation between wind speed (x) and intensity of relative evaporation (y), namely, y = 3. 050 7x0.483 (R2 = 0. 970 2). This indicates evaporation capability will be intensified with the speeding up of the wind, thus promoting the process of soil evaporation. Accordingly, it is significantly important how to do well with retention of water storage for spring woodland and to maintain necessary soil moisture when trees are growing. At the same time, it is necessary to point out that the ascertain of evaporating quantity has great significance to the water balance of this area, the wise utilization of water resources, and the water supply capability of soil as well.