Arid
DOI10.3390/rs5105064
Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing
Chavez, Roberto O.1; Clevers, Jan G. P. W.1; Herold, Martin1; Acevedo, Edmundo2; Ortiz, Mauricio2,3
通讯作者Chavez, Roberto O.
来源期刊REMOTE SENSING
ISSN2072-4292
出版年2013
卷号5期号:10页码:5064-5088
英文摘要

The hyper-arid Atacama Desert is one of the most extreme environments for life and only few species have evolved to survive its aridness. One such species is the tree Prosopis tamarugo Phil. Because Tamarugo completely depends on groundwater, it is being threatened by the high water demand from the Chilean mining industry and the human consumption. In this paper, we identified the most important biophysical variables to assess the water status of Tamarugo trees and tested the potential of WorldView2 satellite images to retrieve these variables. We propose green canopy fraction (GCF) and green drip line leaf area index (DLLAI(green)) as best variables and a value of 0.25 GCF as a critical threshold for Tamarugo survival. Using the WorldView2 spectral bands and an object-based image analysis, we showed that the NDVI and the Red-edge Chlorophyll Index (CIRed-edge) have good potential to retrieve GCF and DLLAI(green). The NDVI performed best for DLLAI(green) (RMSE = 0.4) while the CIRed-edge was best for GCF (RMSE = 0.1). However, both indices were affected by Tamarugo leaf movements (leaves avoid facing direct solar radiation at the hottest time of the day). Thus, monitoring systems based on these indices should consider the time of the day and the season of the year at which the satellite images are acquired.


英文关键词arid ecosystems water stress groundwater depletion LAI green canopy fraction satellite images vegetation indices pulvinar movement
类型Article
语种英语
国家Netherlands ; Chile
收录类别SCI-E
WOS记录号WOS:000328614900016
WOS关键词ORIENTED IMAGE-ANALYSIS ; RED EDGE ; CANOPY ; CHLOROPHYLL ; PLANTS ; SOIL ; ARCHITECTURE ; REFLECTANCE ; FIELD ; SHAPE
WOS类目Remote Sensing
WOS研究方向Remote Sensing
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179716
作者单位1.Wageningen Univ, Lab Geoinformat Sci & Remote Sensing, NL-6700 AA Wageningen, Netherlands;
2.Univ Chile, Fac Ciencias Agron, Lab Relac Suelo Agua Planta, Santiago, Chile;
3.CEAF, Rengo, Chile
推荐引用方式
GB/T 7714
Chavez, Roberto O.,Clevers, Jan G. P. W.,Herold, Martin,et al. Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing[J],2013,5(10):5064-5088.
APA Chavez, Roberto O.,Clevers, Jan G. P. W.,Herold, Martin,Acevedo, Edmundo,&Ortiz, Mauricio.(2013).Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing.REMOTE SENSING,5(10),5064-5088.
MLA Chavez, Roberto O.,et al."Assessing Water Stress of Desert Tamarugo Trees Using in situ Data and Very High Spatial Resolution Remote Sensing".REMOTE SENSING 5.10(2013):5064-5088.
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