刺槐林地土壤水分的周年变化特征

Characteristics of Soil Water in Robinia Pseudoacacia Population

本文根据６ 年的土壤水分定位观测资料，对晋西北黄土丘陵沟壑区刺槐林的土壤水分特点进行了分析。结果表明：刺槐林地的土壤水分受降水量及其分配的影响，土壤含水量随深度增加而减少。不同水文年刺槐林年生长期末的土壤储水量与降水量呈正相关，但同样受降水分配的影响。土壤水分的补充主要靠当年降水；但偏涝年生长期末的土壤水分对翌年生长期初的土壤水分有较大影响。刺槐林地的土壤储水量动态主要受年生长期的降水量及其分配的影响，０～１００ ｃｍ 以内变幅最大。

Based on the filed data measured groups during 6 years in Robinia pseudoacacia population in northwestern Shanxi, the characteristics of soil water were studied. The results were as follows: effected by the precipitation and its distribution, the soil water in Robinia pseudoacacia plantation decreased with the increase of depth. The correlation between stored soil water at the end of growing season and precipitation was significant. The compensation of soil water came from precipitation, but the soil water content at the end of the growing season had a big influence on soil water of the next year. The seasonal change of stored soil water during the growing season was also controlled by the annual precipitation and its distribution. The seasonal change of stored soil water in 0 to 100 cm was obvious, and that in 100 to 200 cm and 200 to 300 cm was relatively stable.