降水与土壤含水量关系分析

目的]了解土壤含水量与降水的关系,为防涝抗旱提供依据.方法]对濉溪县2011-2012年逐日土壤含水量时空变化及其与降水量的关系进行相关分析.结果]0～60 cm土壤含水量与深度二次曲线相关,低点随含水量增加而下移；20～30、60～100 cm土层含水量与月度二次曲线相关.入渗深度与过程降水量、雨前表土层含水量正相关,入渗速度与雨前表土层含水量负相关,雨后耕层含水量与入渗深度正相关.雨后表土层含水量及变化与雨前表土层含水量和降水量对数正相关,雨后10～20 cm土层含水量及变化与雨前10～20 cm土层含水量和降水量正相关.结论]濉溪县常年降水量略有不足,要补充灌溉,抓住有利时机实施人工增雨作业.

Analysis on Relationship between Precipitation and Soil Moisture Content

Objective]The aim was to learn the relationship between soil mois ture and precipitation, and provide the basis for prevent waterlogging and drought. Method]The Suixi County dai ly soil moisture content in 20112012 temporal variation and its relationship with precipitation were analyzed. Result] The moisture content of 060 cm soil was quadratic curve related to the depth, and the low was down with the increase of water content. The water contents of 2030, 60]00 cm soil were associated with month. Infiltration depth was related to precipitation process and the topsoil moisture content. The infiltration rate was negatively related to the topsoil moisture content. The topsoil moisture after the rain was related to the infiltra tion depth. The topsoil moisture content and changes were logarithmically with the topsoil moisture content before rain and precipitation. The water contents of 1020 cm soil after rain and changes were related to the 1020 cm soil before water contents of rain and changes. Conclusion]The annual precipitation of Suixi County was soslightly less, so should be supplied irrigation, and seize the favorable opportunity to carry out ar tificial rainfall operations.