内蒙古荒漠草原降水有效性分析——基于苏尼特右旗过程降水量的监测

研究选取内蒙古苏尼特右旗，通过分析2015年5月至2016年12月日降水数据和同期不同深度土壤（0~10 cm，10~20 cm，20~30 cm，30~40 cm和40~50 cm）含水量日连续观测数据，探讨降水事件对荒漠草原土壤含水量的影响。结果表明:① 降水量对表层土壤（0~10 cm，10~20 cm）含水量影响最剧烈，且2层土壤含水量与降水量存在显著的正相关关系，其余3层土壤含水量对降水事件响应不显著。②0~10 cm、10~20 cm土壤层的最小有效降水量分别为6.4 mm和8.33 mm。③ 结合最小有效降水量进一步推导0~10 cm及10~20 cm土壤层的有效降水转化率发现，0~10 cm土壤最大有效降水转化率可达到95%，但是大部分都是在70%左右；10~20 cm最大有效降水转化率可达90%，但是大部分都是在50%左右。

Precipitation Effectivenessin Desert Steppe in Inner Mongolia: Basedon Monitoring of Storm Precipitation in Sonid Right Banner

Climate change has becomeas one of the global issues in common concern. Water is one of the main limitingfactors in semiarid grasslands. The change of precipitation pattern results inthe change of soil moisture status. The effect of precipitation events on soil moisturecontent in desert steppe was studied based on the analysis of the dailyprecipitation data from May 2015 to December 2016 and the daily continuousobservation data of soil moisture content at different depths (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm). The results showed that: ① The effect of precipitation on topsoil (0-10 cm and10-20 cm) moisture content was the most significant, and there was asignificant positive correlation between the soil moisture content of these twolayers and precipitation. The response of soil moisture content of other threelayers to precipitation events was not significant; ② The minimum volumes of effective precipitation to 0-10cm and 10-20 cm soil layers were 6.4 mm and 8.33 mm respectively;③ Inferred the minimum effective precipitation, it wasfound that the conversion rate of effective precipitation to soil moisture in 0-10cm layer could be as high as 95%, but it was mostly about 70%; it could be ashigh as 90% in 10-20 cm soil layer, but it was mostly about 50%.