黄河源区不同草地类型土壤水分状况及其与降水的关系  

The Status of Soil Moisture in Different Vegetation Types in the Source Region of Yellow River and Its Relationship with Precipitation

作　　者：周曙光[1,2] 张耀生[1] 赵新全[1] 米兆荣[1,2] 

机构地区：[1]中国科学院西北高原生物研究所高原生物适应与进化重点实验室,青海西宁810001 [2]中国科学院研究生院,北京100001

出　　处：《湖南农业科学》2010年第11期41-44,共4页Hunan Agricultural Sciences

基　　金：国家科技支撑计划项目(2006BAC01A02);中国科学院西部行动计划项目(KZCX2XB20601)

摘　　要：利用2007年的土壤水分和降水量资料,分析了黄河源区三种典型草地土壤水分及与降水的关系。结果表明:不同草地间有明显不同的土壤含水量变化特点,4月到10月,高寒草原土壤含水量表现出增长期和相对稳定期两个阶段,温性草原土壤含水量没有明显的阶段性变化特征,人工草地20 cm和40 cm土壤含水量变化规律相似,60 cm和80 cm相似,但前两者与后两者之间差异较大。各草地总体都表现出浅层土壤含水量高,随着深度的增加土壤含水量呈逐渐减小的趋势,但是不同阶段的特点又有差异。土壤含水量受降水影响很大,不同草地或不同深度土壤含水量与降水的关系不同。The soil moisture situations of three different grasslands in the source region of Yellow River and its relationship with precipitation were analyzed based on the data of soil moisture and precipitation in 2007.The results showed that the characteristics of soil moisture were quite different among different grasslands types;the soil moisture in alpine steppe had two phases,which were stable phase and increase phase;the soil moisture in warm steppe had no obvious characteristics of phase change;the changing rules of soil moisture in 20 cm depth and 40 cm depth of artificial grassland were similar,and that in 60 cm depth and 80 cm depth of artificial grassland were also similar,but there is a huge difference between the formal two and the later two;the soil moisture in the three grasslands all was high in shallow soil,and showed the tendency that the content of soil moisture decreased with the increasing soil depth,however,the characteristics were different in different phases;soil moisture was largely affected by precipitation,the relationship between soil moisture and precipitation was different among different grasslands or different depths.

关 键 词：黄河源区 草地 土壤水分 降水 

分 类 号：S152.7[农业科学—土壤学]