干旱区生态环境知识资源中心(Arid): 基于优选植被指数和TVDI的额济纳绿洲旱情监测

Arid

	基于优选植被指数和TVDI的额济纳绿洲旱情监测
其他题名	Drought monitoring in Ejina oasis based on optimal vegetation index and TVDI
	杨丽萍; 白宇兴; 朱江山; 苏志强; 王彤; 孔金玲
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2021
卷号	57 期号:6 页码:727-734
中文摘要	以内蒙古西部的额济纳绿洲为研究区,利用2017年8月24日的Landsat 8影像,基于地表温度-植被指数特征空间理论,提取归一化差值植被指数(NDVI)、比值植被指数、土壤调节植被指数、改进型土壤调节植被指数和优化型土壤调节植被指数(OSAVI),分别计算温度-植被干旱指数(TVDI),利用同期实测土壤水分数据进行精度评定与指数优选,反演区域土壤水分,划分干旱等级.结果表明, TVDI能够反映额济纳绿洲土壤水分的分布状况,是区域旱情监测的有效指标; 5种植被指数中,基于OSAVI和NDVI计算的TVDI与土壤水分的${R^2} > 0.52$, OSAVI优于NDVI,基于OSAVI的TVDI是研究区土壤水分反演的最佳模型;整个研究区以干旱、重旱区为主,干旱现象明显.在空间分布上,除水体以外,旱情状况呈现以绿洲为中心,向四周急剧增加的趋势.
英文摘要	With the Ejina oasis in western Inner Mongolia as the research area, a Landsat 8 image acquired on August 24, 2017 was used to extract the following five vegetation indices: normalized difference vegetation index (NDVI), ratio vegetation index, soil-adjusted vegetation index, modified soil-adjusted vegetation index and optimized soil-adjusted vegetation index (OSAVI), based on the theory of land surface temperature-vegetation index feature space. Temperature-vegetation drought index (TVDI) was calculated, and the in situ measured soil moisture applied for accuracy assessment and vegetation index optimization. Regional soil moisture was retrieved and drought levels graded. The results showed that TVDI could reflect the soil moisture distribution pattern in the Ejina oasis, and also serve as an effective indicator for regional drought monitoring; of the five vegetation indices, the ${R^2}$ values of TVDI calculated by OSAVI and NDVI were relatively higher, both above 0.52. OSAVI was better than NDVI. The TVDI based on OSAVI was considered the optimal model for soil moisture inversion in this area; and drought and severe drought areas had a dominant position in the whole region. From the perspective of spatial distribution, with the exception of water bodies, drought condition spread sharply from the center of the oasis towards the periphery.
中文关键词	植被指数 ; 地表温度 ; 温度-植被干旱指数 ; 旱情监测 ; 额济纳绿洲
英文关键词	vegetation index land surface temperature temperature-vegetation drought index drought monitoring Ejina oasis
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Remote Sensing
CSCD记录号	CSCD:7124071
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377770
作者单位	杨丽萍, 长安大学地质工程与测绘学院, 西安, 陕西 710054, 中国.; 朱江山, 长安大学地质工程与测绘学院, 西安, 陕西 710054, 中国.; 王彤, 长安大学地质工程与测绘学院, 西安, 陕西 710054, 中国.; 孔金玲, 长安大学地质工程与测绘学院, 西安, 陕西 710054, 中国.; 白宇兴, 长安大学地球科学与资源学院, 西安, 陕西 710054, 中国.; 苏志强, 长安大学地球科学与资源学院, 西安, 陕西 710054, 中国.
推荐引用方式 GB/T 7714	杨丽萍,白宇兴,朱江山,等. 基于优选植被指数和TVDI的额济纳绿洲旱情监测[J],2021,57(6):727-734.
APA	杨丽萍,白宇兴,朱江山,苏志强,王彤,&孔金玲.(2021).基于优选植被指数和TVDI的额济纳绿洲旱情监测.兰州大学学报. 自然科学版,57(6),727-734.
MLA	杨丽萍,et al."基于优选植被指数和TVDI的额济纳绿洲旱情监测".兰州大学学报. 自然科学版 57.6(2021):727-734.