论文部分内容阅读
对北京门头沟九龙山不同立地实测的土壤水分特征曲线和土壤有效水分的研究表明：土壤持水性由好到差依次为：阴坡灌木、阴坡裸地、油松、阳坡灌木、阳坡裸地和侧柏；坡向和植被类型对土壤持水性影响极大；同一立地条件下，土壤容重、毛管孔隙度和有机质含量是影响土壤持水性的主要因子；土壤饱和蓄水量变化范围为１６０５．８６～２３５３．６６ｔ／ｈａ，土壤水分只有７、８两月处于易效水阶段，其它时间均属难效水范围，即使雨季的土壤水分也难达到田间持水量；土层蓄水体积小，水分补偿能力差，土壤水分亏缺率为３２％～７５％，构成了该区脆弱的土壤水分生态环境。
The study on soil water characteristic curve and soil available water in different sites of Jiulonggou in Beijing shows that the water retention of soil is in order from good to bad: shady shrub, shady bare land, Pinus tabulaeformis, sunny shrub, sunny slope And oriental arborvitae. The slope type and vegetation type had a great influence on the soil water holding capacity. Soil bulk density, capillary porosity and organic matter content were the main factors affecting the soil water holding capacity under the same site conditions. The range of soil saturated water storage was 1605 .86 ~ 2353.66t / ha, soil moisture is only 7,8 two months in the stage of easy water, other times are within the range of difficult water, even in the rainy season soil moisture is difficult to achieve field capacity; soil water storage volume is small , Poor water compensation ability, soil moisture deficit rate of 32% to 75%, constitute the fragile soil water ecological environment.