土壤结构、水分与植物根系对土壤能量状态的影响

The Influence of the Soil Structure, Water Conent and Plant Root on Soil Energy Appearance

土壤的能量状态反应土壤水分对植物的有效性 ,常以土壤水势来表示。通过对影响土壤水势因子的分析 ,给出土壤水势与土壤结构及含水率关系的表达式。当土壤不含水分时 ,影响土壤水势的因子主要为土壤的结构 ;当土壤含有水分时 ,由于土壤水分中和了部分毛管力 ,随着土壤水含水量的增加 ,土水势必然升高 ,所以 ,土壤结构与土壤含水率决定着土水势的高低。另外由于植物根系影响土壤结构与含水率 ,所以根系对土壤水势的影响也不可忽略。

The soil's energy appearance reflects the soil water availability for live plant. The soil energy which is often called water potential is determined by the factors of the structure and water content of soil, therefore the mathematical formulas are given by analyzing their relationships. The result showed that the soil structure was the main factors influenced the soil potential under absolute-dried condition, and the soil potential went up with the increasing of water content under wet condition. In addition, plant root can also influence soil structure and water content, so the influence of plant root on the soil potential should not be neglected.