Effects of ecological drought on vegetation in Inland River Basin of Inner Mongolia Plateau

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-07-24 DOI:10.1016/j.ejrh.2025.102628

Hongxiang Wang , Yanhua Li , Jian Liu , Sinan Wang , Wenxian Guo

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引用次数: 0

Abstract

Study region

Inland River Basin of Inner Mongolia Plateau(IRB), China.

Study focus

Ecological drought (ED) may trigger irreversible ecosystem disruptions, including shifts in habitat distribution patterns and sharp reductions in species populations within affected environments. This research developed the Standardized Ecological Water Deficit Index (SEWDI), while employing the Carnegie-Ames-Stanford Approach (CASA) model to quantify Net Primary Productivity (NPP) variations in Inland River Basin (IRB). The cumulative and laggged effects of ED on NPP were analyzed using the maximum correlation coefficient method. The NPP loss probability of different ED levels was calculated based on Copula function. The impacts of ED and meteorological factors on NPP were examined through Structural Equation Modeling (SEM).

New hydrological insights for the region

The results reveal that the mean annual NPP exhibited a distinct southeast-to-northwest gradient in spatial distribution. The maximum cumulative correlation between SEWDI and NPP was 87.89 %, mainly in the southern part of IRB. The maximum lagged time correlation showed a positive correlation of 74.65 %, and the average lagged time was 2.60 months. With the increase of ED grade, the probability of NPP loss decreased, and when ED occurred, the high loss probability of NPP less than 0.4 and 0.3 quantile was located in the eastern part of IRB. The total effect of different factors on NPP was SEWDI (0.086), Prec (0.159), Temp (0.282) and Srad (0.077).

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内蒙古高原内陆河流域生态干旱对植被的影响

内蒙古高原内陆河流域研究区域。研究重点：生态干旱可能引发不可逆转的生态系统破坏，包括栖息地分布模式的变化和受影响环境中物种数量的急剧减少。本研究建立了标准化生态水亏指数（SEWDI），并采用卡耐基-艾姆斯-斯坦福方法（CASA）模型对内陆河流域净初级生产力（NPP）变化进行了量化。采用最大相关系数法分析了ED对NPP的累积效应和滞后效应。基于Copula函数计算不同ED水平下的NPP损失概率。利用结构方程模型（SEM）分析了ED和气象因子对NPP的影响。结果表明，年平均NPP在空间分布上呈现明显的东南-西北梯度。SEWDI与NPP的最大累积相关系数为87.89 %，主要分布在中寒带南部。最大滞后时间相关性为74.65 %，平均滞后时间为2.60个月。随着ED等级的增加，NPP损失的概率降低，发生ED时，NPP损失概率在0.4和0.3分位数以下的高分布在IRB的东部。各因子对NPP的总影响分别为SEWDI（0.086）、Prec（0.159）、Temp（0.282）和Srad（0.077）。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.