太湖地区主要水稻土水力特征及其影响因素

Moisture Characteristics and Their Effect Factors of Main Paddy Soils in Tai Lake Region

通过田间和室内试验研究了太湖地区3种主要水稻土(白土、黄泥土和乌栅土)的水分特征以及影响因素,得出了各种土壤每一土层的容重、质地、有机质、土壤团聚度、土壤结构系数和土壤水分特征曲线,比较了3种主要水稻土类型的土壤基本物理性质和水分特征状况,并根据水分特征曲线得出了这3种土壤的田间持水量、有效水含量和萎蔫系数。结果表明:土壤田间持水量和有效水含量均与容重呈极显著的线性负相关,有效水与土壤粘粒含量也呈显著的线性负相关;而土壤的田间持水量和有效水含量与土壤有机质、结构系数、团聚度呈极显著的线性正相关,萎蔫系数与质地也呈显著的线性正相关。

The aim of this article is to study the moisture characteristics and the effect factors of three main kinds of paddy soils (White soil, Yellow mud soil and Wushan soil) in Tai Lake region. The physics properties of the paddy soils have been studied, which includes bulk density, soil texture, soil structure coefficient, soil aggregation, and soil moisture characteristic curves. It is compared that soil moisture characteristic curves of the paddy soils and figured out their field capacities, available water content and wilt coefficient. The results showed that field moisture capacity was significant negative correlated with bulk density and significant positive correlated with soil structure coefficient, soil aggregation and organic matter content. In addition, available moisture content was negative correlated with soil texture, wilt coefficient was positive correlated with soil texture.