Vertical stratification of soil moisture memory and its response to climatic driver factors in inner Mongolia (2001-2024)

IF 2.5 3区环境科学与生态学 Q2 ECOLOGY

Journal of Arid Environments Pub Date : 2026-05-01 Epub Date: 2026-04-30 DOI:10.1016/j.jaridenv.2026.105620

Chaofan Zhou , Huili Gong , Beibei Chen , Xiaojuan Li , Lin Zhu , Mengxuan Bao , Jiajun Zhu

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引用次数: 0

Abstract

Soil moisture (SM) is a key component of land–atmosphere interactions. However, the vertical variability of soil moisture memory (SMM) and its sensitivity to climatic drivers remain insufficiently understood. In this study, we analyzed monthly ERA5-Land SM data (January 2001–December 2024) for four depth layers (0–7, 7–28, 28–100, and 100–289 cm) across Inner Mongolia to characterize the vertical differentiation of SM. Pearson correlation and meta-analysis were applied to quantify the relationships between SM and climatic drivers. The results show that, (1) SM exhibits a pronounced east–west gradient, decreasing from moist conditions in the east to arid conditions in the west. (2) Precipitation is the primary driver of SM dynamics at all depths, yet its influence diminishes markedly with depth. In surface layers, SM is predominantly negative correlation with evapotranspiration (ET) in the southeastern and western regions, and positively correlated with the normalized difference vegetation index (NDVI). In deeper layers, these relationships weaken or reverse. (3) The surface layer (0–7 cm) of SMM has the shortest memory (4–6 months) with a half-life of 1.49 months, whereas deeper layers exhibit substantially longer persistence.

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2001-2024年内蒙古土壤水分记忆垂直分层及其对气候驱动因子的响应

土壤水分是陆地-大气相互作用的重要组成部分。然而，土壤水分记忆（SMM）的垂直变异及其对气候驱动因素的敏感性仍未得到充分的认识。本研究利用2001年1月至2024年12月内蒙古4个深度层（0-7、7-28、28-100和100-289 cm）的ERA5-Land月SM数据，分析了SM的垂直分异特征。应用Pearson相关和meta分析量化了SM与气候驱动因素之间的关系。结果表明，(1)黄土高原地形呈现明显的东西梯度，由东部湿润向西部干旱逐渐减少；(2)降水是各深度SM动态的主要驱动力，但其影响随深度的增加而显著减弱。表层SM与东南、西部蒸散发（ET）呈显著负相关，与归一化植被指数（NDVI）呈正相关。在更深层次上，这些关系会减弱或逆转。(3) SMM的表层（0 ~ 7 cm）记忆时间最短（4 ~ 6个月），半衰期为1.49个月，而深层的半衰期则长得多。

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.