乌审旗半荒漠区土壤水分变化对牧草生长发育的影响——以赖草为例

Changes of Soil Moisture and Its Impact on herbage in semi-desert area of Uxin Banner——Take Leymussecalinus for example

基于乌审召牧业气象试验站29a(1981—2009年)连续观测资料,分析了该地区土壤水分、主要牧草的发育期、产量的变化趋势,同时对土壤水分变化与牧草生长发育的影响进行相关分析。结果表明,对于10~50cm土层而言,其年平均土壤重量含水率均呈下降趋势,而且随着土层深度的增加下降趋势越来越明显(P<0.05);赖草的返青期、黄枯期均呈推后趋势,开花期为提前趋势,生育期呈明显的延长趋势(P<0.01)。赖草干鲜重均呈明显的下降趋势(P<0.01)。土壤含水量与半荒漠牧草生育期、干鲜重的相关性不是很明显。

Based on 29 years （1981-2009） of continuous positioning observation data on grass in UxinJu of Inner Mongolia, by M-K trend method and correlation method, the growing periods and yield trends of the main species of pasture, soil moisture trends, and the relationship between them were analyzed. The results showed that the soil moisture decreased obviously （P 〈0.05） with the increasing of soil depths. The reviving date and withering date of Leymussecalinus had a backward trend, but flowering date had a ahead trend, which made the growing length of Leymussecalinus obviously increased. The dry and fresh weight of Leymussecalinus was decreased markedly. The correlation analysis showed that the correlation between soil water content and the growth period, dry weight and fresh weight of semi desert herbage was not obvious.