黄土高原土壤水分环境评价初步研究

Soil moisture environmental assessment in Loess Plateau

结合植被调查,建立土壤水分研究移动实验室,分析了黄土高原土壤水分环境研究中一些指标的通用性不足问题,以最大吸湿量作为土壤有效水下限,创造性地提出"土壤有效湿度"概念并进行了模型检验,依据该指标建立土壤水分环境评价分级标准并对榆林附近土壤水分环境进行了评价。结果表明:榆林附近土壤水分环境存在类似于延安附近的空间突变现象。实际应用表明,土壤有效湿度指标及其分级标准可以作为黄土高原土壤水分环境评价的初步方案并有望在其它地区推广;结论认为,黄土高原土壤水分环境的空间突变现象具有重要自然地理意义,有深入研究必要。

We analyzed versatility insufficient of main assessing indicators in dried soil layer research of Loess Plateau,proposed concept of available soil moisture content,by taking maximum absorbed water as the lowest limit of effective soil water.Simulation examination showed that effective soil moisture content can be used as soil moisture environmental assessing indicator.We also established soil moisture environmental grading standards,and evaluated depth soil moisture environment near Yulin,evaluation result showed there are spatial sudden change of soil moisture environment,similar to Yan＇an.