干旱区生态环境知识资源中心(Arid): Aridity Thresholds Determine the Relationships Between Ecosystem Functioning and Remotely Sensed Indicators Across Patagonia

Arid

DOI	10.1109/TGRS.2021.3113594
	Aridity Thresholds Determine the Relationships Between Ecosystem Functioning and Remotely Sensed Indicators Across Patagonia
	Zhao, Yanchuang; Guirado, Emilio; Gaitan, Juan J.; Maestre, Fernando T.
通讯作者	Zhao, YC (corresponding author), Henan Univ Technol, Key Lab Grain Informat Proc Ing & Control, Minist Educ, Zhengzhou 450001, Peoples R China.
来源期刊	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN	0196-2892
EISSN	1558-0644
出版年	2022
英文摘要	Emerging evidence suggests that ecosystem responses to increases in atmospheric aridity, a hallmark of climate change, exhibit multiple thresholds across global drylands. However, it is not clear whether aridity thresholds exist in the relationships between ecosystem functions and remotely sensed indicators (RSIs). Assessing this is important because these empirical relationships underpin the statistical models commonly used to estimate ecosystem functioning across large spatial scales, which typically uses data from RSI. We evaluated how the relationships between nutrient cycling index (NCI; a proxy of ecosystem functioning) measured in situ and RSI [albedo and normalized difference vegetation index (NDVI)] change along with a wide aridity (1 - [precipitation/potential evapotranspiration]) gradient in Patagonia (Argentina). For doing so, we used field-based NCI data from 235 ecosystems that were surveyed twice (2008-2013 and 2014-2018). Three aridity thresholds were identified when evaluating the RSI-NCI relationships. The first threshold was found around aridity values ranging from 0.44 to 0.60, while the second and third were concentrated around aridity values of 0.69 and 0.82, respectively. These results indicate that RSI-NCI relationships changed drastically along aridity gradients, and these thresholds should be considered when evaluating ecosystem functions using RSI. In addition, we also found that the relationships between NCI and albedos were not significant around aridity values of 0.82. These results were consistent across sampling dates. Our findings imply that empirical models of the RSI-NCI relationship employing only albedos/reflectance as inputs are not reliable under the most arid conditions and can be used to improve the effectiveness of the use of RSI to monitor and predict changes in ecosystem functioning across large environmental gradients in drylands.
英文关键词	Ecosystems Soil Biological system modeling Indexes Vegetation mapping Remote sensing Land surface Aridity threshold ecosystem function narrowband albedo remote sensing
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000733467300001
WOS关键词	SOIL ORGANIC-CARBON ; LANDSCAPE FUNCTION ; DESERTIFICATION ; INDEXES ; PREDICT ; LAND ; VEGETATION ; ALBEDO ; MULTIFUNCTIONALITY ; CAPABILITY
WOS类目	Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374585
作者单位	[Zhao, Yanchuang] Henan Univ Technol, Key Lab Grain Informat Proc Ing & Control, Minist Educ, Zhengzhou 450001, Peoples R China; [Zhao, Yanchuang] Henan Univ Technol, Coll Informat Sci & Engn, Zhengzhou 450001, Peoples R China; [Guirado, Emilio; Maestre, Fernando T.] Univ Alicante, Inst Multidisciplinar Estudio Medio Ramon Margale, Alicante 03690, Spain; [Gaitan, Juan J.] INTA, Inst Suelos, CIRN, RA-01686 Buenos Aires, DF, Argentina; [Gaitan, Juan J.] Univ Nacl Lujan, Dept Tecnol, RA-6700 Lujan, Buenos Aires, Argentina; [Gaitan, Juan J.] Natl Res Council Argentina CONICET, RA-01686 Buenos Aires, DF, Argentina; [Maestre, Fernando T.] Univ Alicante, Dept Ecol, Alicante 03690, Spain
推荐引用方式 GB/T 7714	Zhao, Yanchuang,Guirado, Emilio,Gaitan, Juan J.,et al. Aridity Thresholds Determine the Relationships Between Ecosystem Functioning and Remotely Sensed Indicators Across Patagonia[J],2022.
APA	Zhao, Yanchuang,Guirado, Emilio,Gaitan, Juan J.,&Maestre, Fernando T..(2022).Aridity Thresholds Determine the Relationships Between Ecosystem Functioning and Remotely Sensed Indicators Across Patagonia.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING.
MLA	Zhao, Yanchuang,et al."Aridity Thresholds Determine the Relationships Between Ecosystem Functioning and Remotely Sensed Indicators Across Patagonia".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING (2022).