Ecosystem drought recovery and influencing factors in temperate China and the Qinghai-Tibet alpine region

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-09-05 DOI:10.1016/j.catena.2025.109417

Yunfan Sun, Qingyu Guan, Zepeng Zhang, Jun Zhang, Ziyang Cui, Leyao Pan

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引用次数: 0

Abstract

The increasing frequency and severity of droughts are expected to pose serious threats to vegetation growth in temperate China and the Qinghai-Tibet alpine region. Although drought recovery time represents a crucial aspect of vegetation recovery, the relationship between recovery time and resilience remains insufficiently understood. This study employed remote sensing vegetation indices and the standardized precipitation evapotranspiration index (SPEI) to analyze vegetation drought recovery time and resilience in temperate China and the Qinghai-Tibet alpine region. Furthermore, the study applied an extreme gradient boosting (XGBoost) model integrated with SHapley Additive exPlanations (SHAP) framework to identify key determinants of vegetation recovery. The results showed that vegetation in approximately 70 % of the study area recovered to normal conditions within 6 months after drought. Recovery time was longer in arid and humid regions, while it was 0.5–1 month shorter in semi-humid and semi-arid regions. Recovery time was strongly influenced by the climatic conditions during and before the drought recovery period. Drought resilience was markedly lower in arid regions relative to semi-arid, semi-humid, and humid regions. Elevation, drought intensity, and vegetation conditions were identified as key drivers of resilience. Additionally, droughts occurring in the early growing season required a longer recovery time but exhibited generally higher resilience than those occurring in the late growing season. This study also highlights regions that are facing severe drought recovery challenges. These results provide important insights for understanding ecosystem drought recovery and offer scientific support for drought management strategies in temperate China and the Qinghai-Tibet alpine region.

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尽管干旱恢复时间是植被恢复的一个重要方面，但恢复时间与恢复力之间的关系仍然没有得到充分的了解。此外，该研究还应用了一个结合SHapley加性解释（SHAP）框架的极端梯度增强（XGBoost）模型来确定植被恢复的关键决定因素。结果表明，研究区约70%的植被在干旱后6个月内恢复到正常状态。干旱湿润地区恢复时间较长，半湿润半干旱区恢复时间短0.5 ~ 1个月。旱情恢复期和旱情恢复期前的气候条件对恢复时间的影响较大。干旱地区的抗旱能力明显低于半干旱、半湿润和湿润地区。海拔、干旱强度和植被条件被确定为恢复力的关键驱动因素。此外，发生在生长季早期的干旱需要较长的恢复时间，但普遍表现出比发生在生长季后期的干旱更高的恢复力。这项研究还强调了面临严重干旱恢复挑战的地区。

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

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.