Drivers of ecological drought recovery: Insights from meteorological and soil drought impact

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2024-11-17 DOI:10.1016/j.jhydrol.2024.132324

Chenhao Ge , Peng Sun , Rui Yao , Yayi Zhang , Han Shen , Huilin Yang

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引用次数: 0

Abstract

Prolonged droughts typically have more severe impacts on ecosystems. The recovery time (RT) from drought is a crucial indicator for assessing the extent of drought impact on ecosystems. However, the drought recovery extent and dominant factors in the recovery characteristics of ecological drought (ED) from meteorological drought (MD) and soil drought (SD) remain to be further clarified. Therefore, this study employs reanalysis data and remote sensing vegetation indices to analyze the spatial patterns of ED recovery times from MD/SD (MRT/SRT). The dominant factors affecting RT across climatic zones were identified using random forest regression models and partial correlation, and the response characteristics of RT to these dominant factors under different land cover and irrigation types were explored. Regions with high recovery pressure and differential rates were identified, and their driving factors were explored. The results show that the SRT in China is approximately twice the MRT. Farmland experiences the highest MRT (4.9 months), particularly in the continuous and double-cropping irrigation areas of North China, while bare ground has the highest average SRT (6.4 months). MRT/SRT in China is most significantly influenced by surface temperature (TEM) and atmospheric vapor pressure deficit (VPD) during the recovery period, showing a predominant positive response to dominant factors across climatic zones. Grassland RT is notably affected by variations in all types of climatic factors. However, an increase in TEM and VPD significantly extends the RT of farmlands, especially in the double-cropping irrigation areas of North and Central China. Compared to MD, ED has more difficulty recovering from SD, exhibiting higher RT, recovery stress, and recovery differential rate. Decrease in soil moisture (SM) lead to poorer drought recovery outcomes. This study uncovers the differentiated recovery characteristics of ED in response to various types of drought and their dominant factors, deepening our understanding of the recovery process among different types of drought.

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生态干旱恢复的驱动因素：气象和土壤干旱影响的启示

长期干旱通常会对生态系统造成更严重的影响。干旱恢复时间（RT）是评估干旱对生态系统影响程度的重要指标。然而，气象干旱（MD）和土壤干旱（SD）的干旱恢复程度以及生态干旱（ED）恢复特征的主导因素仍有待进一步明确。因此，本研究利用再分析数据和遥感植被指数分析了气象干旱/土壤干旱生态干旱恢复时间（MRT/SRT）的空间格局。利用随机森林回归模型和偏相关法确定了影响不同气候区 RT 的主导因子，并探讨了不同土地覆盖和灌溉类型下 RT 对这些主导因子的响应特征。确定了高恢复压力和高差异率地区，并探讨了其驱动因素。结果表明，中国的 SRT 约为 MRT 的两倍。农田的 MRT 最高（4.9 个月），尤其是在华北的连作灌溉区和双季灌溉区，而裸地的平均 SRT 最高（6.4 个月）。在恢复期，地表温度（TEM）和大气水汽压差（VPD）对中国 MRT/SRT 的影响最为显著，各气候区对主导因子的正向响应占主导地位。草地 RT 受各类气候因子变化的影响显著。然而，TEM 和 VPD 的增加会显著延长农田的 RT，尤其是在华北和华中的双季灌溉区。与 MD 相比，ED 更难从 SD 中恢复，表现出更高的 RT、恢复压力和恢复差异率。土壤水分（SM）的减少导致干旱恢复效果更差。本研究揭示了ED在不同类型干旱下的恢复特征及其主导因素，加深了我们对不同类型干旱恢复过程的理解。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.