太行山山前平原土壤有效水动态分析

Analysis of Available Soil Moisture Changes in Taihang Mountain Piedmont Plain

利用栾城试验站1998-2002年的降水和土壤水观测资料,探讨太行山山前平原的土壤有效水量和土壤水有效性的时间变化特征。结果表明,①土壤有效水量年内变化明显,受降水影响显著;年际变化呈减少趋势,秋季变化幅度最大;作物的主要供水层下移。②作物根系层土壤水的总体有效性在全年基本为"中效";在冬小麦生育期,深层的土壤水逐渐转为"难效",经过雨季能基本得到缓解;自1998年至2001年土壤水分有效性等级由浅层至深层依次降低。

Based on precipitation and soil moisture data from 1998 to 2002 in Luancheng agricultural observation station, the temporal change characteristics of the available soil moisture quantity and soil water availability in the Taihang piedmont plain were analyzed. The result showed that the available soil water quantity varied and was affected by precipitation apparently during a year. The annual variation in quantity showed a decreased trend with a most extent in autumn. The soil layer of water supply for crop deepened. The total availability of soil water was generally at the mid-available state during a year, while the soil water of deeper layers gradually converted to a hard available state during the growing period of winter wheat and could be alleviated through rain season. The annual soil moisture availability declined from lower layers to deeper layers.