摘要
太湖地区主要水稻土类型的水分参数研究结果表明 ,水稻土 4个土层的土壤水分特征曲线基本一致。土壤的饱和含水量、田间持水量、凋萎系数和土壤有效水的含量均从土壤上层到下层呈降低的趋势 ;土壤的非饱和导水率与负压水头之间呈负相关的指数曲线变化 ,当负压水头达到 10 k Pa时 ,非饱和导水率降低到最小值 ,且基本趋于稳定 ;非饱和土壤水扩散率变化于 1.1× 10 - 3～ 1.886× 10 - 3cm2 / min之间 ,非饱和土壤水扩散率随含水量也呈指数曲线变化。
The soil moisture parameters of main paddy soil o f Tai Lake region were studied. The results were as follows. (1)The soil water c haracteristic curves of four soil layers in this soil were consistent. The satur ated water content, field capacity, wilting coefficient and available water capa city decreased from top soil to bottom in soil profile. (2)The unsaturated hydra ulic conductivity was significant relation with the negative pressure head in ex ponential function and tended to stable when the negative pressure is about 10 k Pa. (3) The unsaturated soil diffusion coefficient of studied soils ranged from 1.053×10^(-3)~1.886×10^(-3) cm^2/min, which was in a sharp positive r elation with soil moisture content in exponential function.
出处
《水土保持学报》
CSCD
北大核心
2001年第4期96-98,125,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金重点项目 :"太湖地区土壤质量演变"( 498310 70 )
国家重点基础研究发展规则项目( G19990 1180 6)
关键词
太湖地区
水稻土
水分参数
Tai Lake region
paddy soil
soil moisture param eters
