基于TVDI的藏北地区土壤湿度空间格局
The Spatial Pattern of Soil Moisture in Northern Tibet Based on TVDI Method
查看参考文献23篇
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文摘
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利用2010年DOY 209期的Terra/MODIS 16 d合成的植被指数(EVI)产品数据MOD13 A2和8 d天合成的地表温度(LST)产品数据MOD11 A2，构建LST-EVI特征空间，从而得到了条件温度植被干旱指数TVDI反映的藏北土壤湿度空间分布图。结合野外同步土壤表层水含量测试数据，二者表现出较好的相关程度，并通过0.05水平的显著性检验。对藏北地区土壤湿度的空间格局和分异规律分析，研究结果表明：①藏北全区TVDI值呈正态分布，东部地区偏湿，中部地区多数为正常湿度，而西部TVDI直方图分布形状与全区相似，但偏旱；②藏北地区不同气候区划内土壤湿度分异较大，那曲高山谷地亚寒带半湿润区土壤湿度最高，其空间变异也最强烈，青南高原亚寒带半干旱区土壤干旱最严重；③研究区内土壤湿度空间分布受海拔影响较为明显，在海拔4500 m以下的地区土壤湿度随海拔升高而降低，此后，土壤湿度随着海拔升高而升高。 |
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其他语种文摘
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Using enhanced vegetation index(EVI)and land surface temperature(LST)dataset derived from TERRA/MODIS synthetic products MOD13 A2(16-day composite,DOY 209 in 2010)and MOD11 A2(8-day composite,DOY 209 and 217 in 2010),the LST-EVI two-dimensional characteristic space was constructed,and then TVDI(temperature-vegetation drought index)was extracted to indicate the top-soil moisture of northern Tibet.Furthermore,the simulated soil moisture was verified by synchronously measured data in the field.The two groups of data showed a strong relationship and the correlation coefficient got through the 0.05 significance level.Then the spatial pattern and heterogeneity of soil moisture in the studied area were further analyzed,and the results showed:(1)the TVDI values of pixels in northern Tibet proved to have a statistically normal distribution,and the soil moisture in eastern region,central region and western region respectively showed wet,normal and dry situations;(2)evident difference in soil moisture existed in different climatic zones,and the soil moisture in the mountain and valley-in-valley structured Nagqu sub-arctic and sub-humid zone was the highest and that in southern Qinghai sub arctic and semiarid zone was the lowest;(3)the spatial distribution of soil moisture in the area was obviously affected by the altitude.The soil moisture in the region below 4500 m showed a negative correlation with the altitude and the correlation was positive in the region higher than 4500 m. |
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来源
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地理科学进展
,2011,30(5):569-576 【核心库】
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关键词
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温度植被干旱指数
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藏北地区
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土壤湿度
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MODIS
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空间格局
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地址
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中国科学院地理科学与资源研究所, 中国科学院资源与环境信息系统国家重点实验室, 北京, 100101
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中国农业科学院农业环境与可持续发展研究所, 100081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-6301 |
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学科
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自然研究、自然历史 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:4209763
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