青海湖流域不同海拔高度土壤水分时空变化特征

发布时间：2018-04-30 04:20

本文选题：土壤水分 + 海拔梯度　；参考：《资源科学》2017年02期

【摘要】：在气候变化背景下探讨流域不同海拔高度的土壤水分状况,对于深入认识变化环境下流域水资源特征具有十分重要的意义。本文通过对青海湖流域不同海拔高度的土壤水分采样,探讨了流域土壤水分的时空变化规律,并对生长季流域不同海拔的水分盈亏状况进行了初步分析,结果表明:(1)流域平均土壤含水量在生长季旺期达到峰值(28.79%),生长季初期(22.81%)和生长季末期(22.91%)相对较低;随海拔的升高,流域土壤含水量不断增加,且在生长季旺期增加最为显著(P0.01);(2)经过一个生长季,湖滨3200~3300m海拔范围内土壤水分收支略有亏缺,减少1.24%,3300~3400m和3400~3600m海拔范围内,水分收支基本平衡,分别增加0.54%和-0.57%,3600~3800m海拔范围内,水分收支有所盈余,增加3.69%;流域海拔3800m以上地区为水分盈余区,且该区域对气候变化较为敏感,气温升高一旦导致流域水分收支平衡区向高海拔推进,将会使青海湖流域水分盈余区大面积减小,进而对流域水资源造成严重影响。
[Abstract]:Under the background of climate change, it is of great significance to study the soil water status at different elevations of the watershed, which is of great significance for further understanding the characteristics of water resources in the basin under the changing environment. Through sampling soil moisture at different altitudes in Qinghai Lake Basin, the temporal and spatial variation of soil moisture in the basin is discussed, and the water profit and loss at different elevations in the growing season are preliminarily analyzed. The results showed that the average soil water content of the watershed reached a peak value of 28.79 at the peak stage of the growing season, and was relatively low at the beginning of the growing season, and at the end of the growing season. After a growing season, the soil moisture budget of lakeside (3200m ~ 3300m) was slightly deficient, and the water budget was basically balanced at the altitude of 3.2400m and 3400m, increasing by 0.54% and -0.57360000m, respectively, at 3300m and 3400m, respectively. The area above 3800m above sea level is the water surplus area, and the region is sensitive to climate change. Once the temperature rises, the water budget balance area of the basin will advance to the high altitude. It will reduce the large area of water surplus area in Qinghai Lake basin, which will have a serious impact on the water resources of the basin.
【作者单位】：北京师范大学资源学院;北京师范大学地表过程与资源生态国家重点实验室;刚察县青海省三角城种羊场;
【基金】：国家自然科学基金重点项目(41130640) 教育部“创新团队发展计划”项目(IRT_15R06)
【分类号】：S152.7

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