Investigating spatiotemporal variability of drought and its impact on grassland GPP in Inner Mongolia

IF 2.6 3区环境科学与生态学 Q2 ECOLOGY

Journal of Arid Environments Pub Date : 2025-06-16 DOI:10.1016/j.jaridenv.2025.105425

Jingfang Zhang , Fanhao Meng , Min Luo , Yixin Fang , Hongguang Chen , Chula Sa , Wenfeng Chi , Yuhai Bao

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引用次数: 0

Abstract

Drought events are one of the main factors driving changes in grassland ecosystem productivity. This study aims to investigate the spatiotemporal characteristics of drought in Inner Mongolia's grasslands and its impact mechanisms on grassland productivity. The findings show that: (1) From 1992 to 2018, the overall trend in Inner Mongolia's Gross Primary Productivity (GPP) was declined (56.54 %), with a decline rate of 0.364 gC·m⁻²·a⁻¹. Among the three grassland types, only desert steppe GPP exhibited an increasing trend. The Standardized Precipitation Evapotranspiration Index (SPEI) exhibited an overall declining trend, covering 95.54 % of the area. (2) The positive correlation between GPP and SPEI in Inner Mongolia's grasslands was the strongest (88.78 %), with a significant positive correlation in 35.44 % of the area. (3) SPEI has a significant positive effect on grassland GPP, with an influence coefficient of 0.203, and it also had significant indirect effects through soil moisture (SM), Vapor Pressure Deficit (VPD), and Normalized Difference Vegetation Index (NDVI). Among different grassland types, the effect of SPEI on meadow and typical steppe GPP gradually weakened, while its influence on desert steppe GPP progressively strengthened. This study provides important theoretical support for the sustainable development of the region's grassland ecosystems.

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内蒙古干旱时空变化特征及其对草地GPP的影响

干旱事件是草地生态系统生产力变化的主要驱动因素之一。本研究旨在探讨内蒙古草原干旱的时空特征及其对草地生产力的影响机制。结果表明：①1992 ~ 2018年，内蒙古地区总初级生产力总体呈下降趋势（56.54%），下降幅度为0.364 gC·m−2·a−1；3种草地类型中，只有荒漠草原GPP呈增加趋势。标准化降水蒸散指数（SPEI）总体呈下降趋势，覆盖面积为95.54%。(2)内蒙古草原GPP与SPEI正相关最强（88.78%），显著正相关面积为35.44%；(3) SPEI对草地GPP有显著的正向影响，影响系数为0.203，并通过土壤水分（SM）、水汽压亏缺（VPD）和归一化植被指数（NDVI）间接影响草地GPP。在不同草地类型中，SPEI对草甸和典型草原GPP的影响逐渐减弱，对荒漠草原GPP的影响逐渐增强。该研究为该地区草地生态系统的可持续发展提供了重要的理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Arid Environments 环境科学-环境科学

CiteScore

5.70

自引率

3.70%

发文量

144

审稿时长

55 days

期刊介绍： The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.