Early hydrothermal conditions have a vital role in the responses of vegetation to extreme drought in Southwest China

IF 5.6 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-03-27 DOI:10.1016/j.agrformet.2025.110523

Xu Xue , Wen Chen

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引用次数: 0

Abstract

Southwest China was affected by two extreme droughts in the autumn to spring of 2012–2013 and the winter to summer of 2020–2021. These droughts caused water depletion, crop damage, and socio-economic disruption. However, little is known about the accurate representation of the two drought events and the responses of vegetation to the droughts. We used multiple vegetation indices and multi-source climate data to quantify the spatiotemporal variations of the two events. We assessed the different responses of vegetation greenness in Southwest China to the two drought events to determine the underlying mechanisms. Vegetation greenness in Southwest China showed different responses to the two events due to differences in the early hydrothermal conditions. The 2012–2013 autumn–spring drought suppressed vegetation growth in Southwest China, with a total decrease of 0.17 (31.7 %) in the normalized difference vegetation index relative to the baseline conditions in the early stage of the drought. The decrease in precipitation and soil water depletion in late summer 2012 aggravated the decrease in vegetation greenness from winter 2012 to spring 2013. By contrast, during the winter–summer drought in 2020–2021, there was an increase of 0.22 (52.3 %) in the normalized difference vegetation index in January–March 2021 relative to the baseline conditions. Adequate precipitation and soil water in the late summer to autumn of 2020 compensated for water loss due to the extreme drought, and, concurrently, more downward solar radiation and warmer conditions linked to less cloudiness contributed to vegetation greening in spring 2021. These results show that early hydrothermal conditions have a vital role in the different responses of vegetation greenness to extreme drought events. These results will help in water management and ecosystem protection in the current background of more frequent extreme weather and climate events resulting from the global climate crisis.

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早期热液条件在西南地区植被对极端干旱的响应中具有重要作用

西南地区在2012-2013年秋春和2020-2021年冬夏经历了两次极端干旱。这些干旱造成水资源枯竭、作物受损和社会经济中断。然而，人们对这两次干旱事件的准确描述以及植被对干旱的反应知之甚少。我们利用多种植被指数和多源气候数据量化了这两个事件的时空变化。研究了西南地区植被绿度对两次干旱事件的不同响应，以确定其潜在机制。由于早期热液条件的差异，西南地区植被绿度对这两个事件的响应不同。2012-2013年秋春干旱抑制了西南地区植被的生长，干旱初期植被指数与基线相比减少了0.17（31.7%）。2012年夏末降水减少和土壤水分耗竭加剧了2012年冬季至2013年春季植被绿度的下降。而在2020-2021年冬夏干旱期间，2021年1 - 3月的归一化植被差指数相对于基线条件增加了0.22（52.3%）。2020年夏末至秋季充足的降水和土壤水分弥补了极端干旱造成的水分流失，同时，更多的向下太阳辐射和与云量减少相关的更温暖的条件促进了2021年春季的植被绿化。这些结果表明，早期热液条件在植被绿度对极端干旱事件的不同响应中起着重要作用。这些结果将有助于在当前全球气候危机导致极端天气和气候事件更加频繁的背景下进行水管理和生态系统保护。

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.