摘要
林草植被深层土壤干燥化是黄土高原地区生态环境建设过程中面临的重大科学问题。采用人工降雨的试验方法,对黄土高原沟壑区荒草坡地不同水文年土壤水平衡进行了数值模拟,结果表明:当植被覆盖率较高时,WAVES模型可以应用于荒草坡地土壤水平衡的模拟;土壤储水量的模拟结果与实测值趋势很吻合,但有关参数的取值还有待于进一步研究;荒草地土壤水分收支基本平衡所需的雨季降雨量和年总降雨量分别为507.0mm和747.6mm,分别高于黄土高原地区多年平均的雨季降雨量和年总降雨量,预示黄土高原地区干旱年和平水年土壤水分易收支负平衡,从而形成土壤干层。
Desiccation of the deep soil layer under forest and grass vegetation is one of the crucial topics in scientific research for eco-environmental construction of the Loess Plateau. Soil water balance of grassland in gully regions on the Loess Tableland in various hydrological years was simulated numerically with simulated rainfall. The results show that soil water balance of grassland with high vegetation cover ratio could be studied with WAVES model,and the simulated values of soil water storage capacity agree well with the measured values but how to determine correlative parameters need to be studied further. To keep in balance the supply and the demand of soil water,the rainfall amount during the rainy season and in the whole year should at least be 507.0 mm and 747.6 mm respectively,higher than the multi-year average value,respectively,indicating that soil water tends to have deficit in drought and average years on the Loess Plateau,leading to formation of the dry soil layer.
出处
《土壤学报》
CAS
CSCD
北大核心
2005年第3期353-359,共7页
Acta Pedologica Sinica
基金
国家自然科学基金重大研究计划(90102012)
中国科学院知识创新工程领域前沿项目(01200220055413)资助
