摘要
为了解黄土丘陵区不同坡向林地土壤水分的变化规律,在山西中阳县的圪针耳流域内,以不同坡向柠条林地为对象,对其土壤水分动态特征进行了研究。结果表明:土壤水分变化具有明显的时空规律。1)土壤剖面按含水量变化幅度大小分为活跃层、次活跃层和相对稳定层3个层次,3个层次土壤相对含水量的变异系数从上至下呈由大而小变化;2)土壤水分的季节变化可分为明显的3个时期:土壤水分消耗期、土壤水分补偿期、土壤水分消退期。3)降水是影响土壤水分变化的重要因素,土壤水分对降雨具有一定的滞后性。坡向对土壤水分的时空分布有重要影响。
Abstract：To find out the variant rule of Soil Moisture in forest with different exposure in Loess Hilly Areas. Theresearch on Dynamics of Soil Moisture in Caragana forest with different exposure in Arid and Semiarid Loess Hilly Areas is processed in Gezhener water valley, Zhongyang, Shanxi province. Results indicate that in arid and semiarid areas, like Loess hilly areas. Temporal and spatial variability of Soil moisture content is obvious. 1）By the variational extent of the soil moisture, the layer can be vertically divided into three layers, which are active layer （0～40cm）, secondary active layer（40～80cm） and relatively stable layer（under 80cm）. 2）The coefficient of different of variation soil-moisture-content declines from top layer to down one. Changes of season influences the dynamical behavior of soil moisture. 3） Rainfall is the most important factor which influences soil moisture,there is about one week lag behind the rainfall. Other landform factors, like exposure, has some important influence to the space-time variant rule,too.
出处
《山东林业科技》
2007年第3期3-5,27,共4页
Journal of Shandong Forestry Science and Technology
基金
"十五"国家科技攻关子专题"黄土丘陵区退耕还林与植被恢复技术与示范研究"(编号2001BA510B0404)
关键词
黄土丘陵
土壤水分
动态变化
相对含水量
Loess hilly
soil moisture
dynamic
soil relative water content
