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Vegetation drought risk assessment based on the multi-weight methods in Northwest China

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Abstract

Vegetation makes an outstanding contribution to the stability of ecosystems and to a certain extent reflects the state of the terrestrial ecosystem. Drought conditions greatly affect the growth and development process of vegetation due to its remarkable stochasticity and complexity. Due to the complex coupling mechanism between vegetation and drought, the research on vegetation drought risk is still limited. In this work, we focus on Northwest China and use the improved vegetation health index (VHI) and other multi-source data. We selected indicator factors based on both hazard and vulnerability, and adopt three weight determination methods, namely entropy method, critic method, and coefficient of variation method, to construct the corresponding index model, and also to establish a vegetation drought risk assessment model to quantitatively evaluate the drought risk of vegetation in northwest China. Results show that the percentage of each drought category remarkably changed during the period encompassing 1981–2020, and the vegetation drought shows deterioration in more areas of northwest China. The vegetation drought risks derived from the three weight determination methods were generally consistent, but differed for a particular vegetation type. The overall spatial distribution pattern of vegetation drought risk in Northwest China is higher in the west and lower in the east, and the vegetation in southern Qinghai and northwestern Xinjiang presents higher drought risk. This study may be used as a tool to provide quantitative basis for vegetation protection and vegetation drought management.

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Data availability

The datasets used in this study are available in the National Oceanic and Atmospheric Administration (NOAA, Index of/pub/corp/scsb/wguo/data/ Blended_VH_4km/geo_TIFF (noaa.gov)), the Resource and Environment Science and Data Center (http://www.resdc.cn/), the Earth Resources Observation Centre (LP DAAC, https://lpdaac.usgs.gov/product_search/), and the Harmonized World Soil Database (HWSD, https://www.fao.org/soils-portal/en/).

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Funding

This work was supported by the open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research), Grant NO: IWHR-SKL-KF202007, the Natural Science Foundation of Fujian Province (2021J01627), and the National Natural Science Foundation of China (41601562).

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Contributions

The conception and design of the study was performed by Huixia Chen and Qianfeng Wang. Material preparation, analysis, and the first draft of the manuscript were performed by Huixia Chen. Virgílio A. Bento reviewed and edited the manuscript. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Qianfeng Wang or Xianyong Meng.

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All authors have read, understood, and have complied as applicable with the statement on “Ethical responsibilities of Authors” as found in the Instructions for Authors.

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Informed consent was obtained from all individual participants included in the study.

Competing interests

The authors declare no competing interests.

Research involving human participants and/or animals

This article does not contain any studies with human participants and animals performed by any of the authors.

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Highlight

• Improved VHI and multi-weight methods were used to assess vegetation drought risk.

• Vegetation drought level changed evidently, with more areas deteriorated.

• The drought risk derived from different methods presents overall consistency, but varied with vegetation types.

• The vegetation drought risk in Northwest China is higher in the west and lower in the east.

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Chen, H., Wang, Q., Bento, V.A. et al. Vegetation drought risk assessment based on the multi-weight methods in Northwest China. Environ Monit Assess 195, 1148 (2023). https://doi.org/10.1007/s10661-023-11747-z

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  • DOI: https://doi.org/10.1007/s10661-023-11747-z

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