干旱区生态环境知识资源中心(Arid): TVDI用于干旱区农业旱情监测的适宜性

Arid

	TVDI用于干旱区农业旱情监测的适宜性
其他题名	Suitability of TVDI Used to Monitor Agricultural Drought in Arid Area
	张喆; 丁建丽; 李鑫; 鄢雪英
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2015
卷号	35 期号:1 页码:220-227
中文摘要	基于地表温度/植被指数(Ts/VI)特征空间建立的温度植被干旱指数(TVDI)受诸多因素的影响,其中一个重要的影响因素是植被指数,该指数在高、低植被覆盖时的敏感性不同,从而导致TVDI对旱情监测的准确度不同。针对这一问题,以新疆塔里木盆地北缘渭干河-库车河三角洲绿洲为研究区,选择2011年4月、8月两景TM影像,利用归一化植被指数(NDVI)和比值植被指数(RVI)分别建立Ts/VI特征空间,线性拟合特征空间的上、下边界,计算得到两种温度植被干旱指数(TVDI-NDVI、TVDI-RVI)。用TVDI与同期野外实测的土壤含水量数据进行回归分析。结果表明:(1)植被指数、地表温度、土壤水分之间有显著互动关系,以不同植被指数计算得到的两种TVDI与表层土壤水分相关性较好,均能够反映区域土壤干旱状况;(2)由于植被指数对植被探测的敏感性,在4月低植被覆盖时,TVDI-NDVI与表层土壤水分的相关性较高,为0.4299,8月高植被覆盖时,TVDI-RVI与表层土壤水分的相关性较高,达到0.5791;(3)在低植被覆盖区域,NDVI较RVI敏感,而在高植被覆盖区域,RVI敏感性较高。RVI适用于高植被覆盖时反演土壤湿度,NDVI则更适用于中、低植被覆盖时。
英文摘要	Vegetation index has different vegetation detection capability which could result in the different sensitivity on temperature vegetation dryness index.Therefore,two sets of image in April and August of 2011 were chosen to construct the Surface Temperature (Ts)/Vegetation Index (VI)feature space which used Normalized Difference Vegetation Index (NDVI),Ratio Vegetation Index (RVI)and LSTin the Delta Oasis of the Weigan and Kuqa Rivers in Xinjiang.In the establishment of the T_s/VI space,linear regression functions were used to approximately fit the lower and upper boundaries of the T_s/VI space so that the dry and wet edges of the space could be determined.Two T_s/VI spaces were established based on the T_s/NDVI and T_s/RVI and the difference between the two spaces were investigated.Temperature Vegetation Dryness Index (TVDI)was calculated from the T_s/NDVI and the T_s/RVI spaces.Make use of TVDI and contemporaneous field measured soil gravimetric water moistures data carrying through regress analysis and establish experienced models of TVDI to assess soil moisture.The main results were as follows:(1)It was significantly associated among VI,Tsand soil moisture.TVDI-NDVI and TVDI-RVI could be used to predict the near surface soil water moisture.(2)TVDI-NDVI had a higher correlation(0.4299)with the soil surface moisture in April(low vegetation coverage month)but TVDI-RVI had a higher correlation(0.5791)with the soil surface moisture in August(high vegetation coverage month).(3)Analyzing and comparing NDVI and RVI,it was showed that NDVI was sensitive in the low vegetation coverage and RVI was sensitive in the high vegetation coverage.The conclusion was the T_s/RVI feature space was more suitable for inversing soil moisture in high vegetation coverage and the T_s/NDVI feature space was more suitable for inversing soil moisture in low vegetation coverage.
中文关键词	归一化植被指数 ; 比值植被指数 ; 地表温度 ; 温度植被干旱指数
英文关键词	NDVI RVI LST TVDI
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5337123
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233717
作者单位	新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	张喆,丁建丽,李鑫,等. TVDI用于干旱区农业旱情监测的适宜性[J]. 新疆大学,2015,35(1):220-227.
APA	张喆,丁建丽,李鑫,&鄢雪英.(2015).TVDI用于干旱区农业旱情监测的适宜性.中国沙漠,35(1),220-227.
MLA	张喆,et al."TVDI用于干旱区农业旱情监测的适宜性".中国沙漠 35.1(2015):220-227.