基于TVDI的羌塘高原夏季土壤湿度变化分析

发布时间：2018-08-27 15:00

【摘要】：土壤湿度是生态系统的关键参数,实时、有效地监测土壤湿度有助于增强对区域气候与环境变化的理解。利用温度植被干旱指数法(TVDI)反演羌塘高原2000-2014年夏季土壤湿度,以2014年为例分析该年夏季土壤湿度空间分布并探讨2000-2014年土壤湿度的动态特征。结果表明:(1)2014年羌塘高原夏季土壤湿度空间分布表现为东南部偏湿润、西北部偏干旱。从东到西土壤湿度逐渐降低,南北干湿状况交替分布。土壤湿度干旱、偏干、正常、偏湿、湿润面积比分别为3.84%、27.17%、37.64%、29.63%、1.72%。(2)2000-2014年羌塘高原北部和中部地区夏季土壤湿度呈现显著变干的趋势,而南部大部分地区土壤湿度变化趋势不显著。15年间土壤干旱和湿润面积比例最小且波动小,偏干、正常、偏湿土壤面积均出现不同程度的波动。(3)降水量是影响TVDI的重要因子且具有一定的滞后性,而气温影响相对较小。
[Abstract]:Soil moisture is the key parameter of ecosystem. Monitoring soil moisture effectively in real time is helpful to enhance the understanding of regional climate and environment change. Soil moisture in Qiangtang Plateau from 2000 to 2014 was retrieved by using (TVDI) method of temperature vegetation drought index. The spatial distribution of soil moisture in that summer was analyzed and the dynamic characteristics of soil moisture during 2000-2014 were analyzed by taking 2014 as an example. The results were as follows: (1) the spatial distribution of soil moisture in the Qiangtang Plateau in 2014 was moist in the southeast and dry in the northwest. Soil moisture gradually decreased from east to west, and the dry and wet distribution alternately between north and south. Soil moisture was dry, normal, wet and wet area ratio was 3.84 ~ 27.17 and 37.64 ~ 29.63 ~ 1.72% respectively. (2) soil moisture in the northern and central areas of Qiangtang Plateau from 2000 to 2014 showed a significant trend of dry. However, the variation trend of soil moisture in most areas of southern China is not significant. The proportion of soil drought and humid area in the last 15 years is the smallest, the fluctuation is small, the soil is dry and normal, (3) precipitation is an important factor affecting TVDI and has a certain lag, but temperature has a relatively small effect.
【作者单位】：中国科学院地理科学与资源研究所陆地表层格局与模拟重点实验室;西南大学资源环境学院;中国科学院大学;中国科学院青藏高原地球科学卓越创新中心;
【基金】：国家科技基础性工作专项重点项目(2012FY111400) 中国科学院战略性先导科技专项(XDB03030501) 国家自然科学基金项目(41671104)
【分类号】：S152.71

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