中亚干旱地区植被物候变化及其对不同土壤湿度层的响应，1982-2022 年

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.2024.132314

Ruikang Tian , Jianhao Li , Jianghua Zheng , Liang Liu , Wanqiang Han , Yujia Liu

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引用次数: 0

摘要

全球气温升高加剧了中亚地区的水文失衡，严重影响了该地区土壤水分的动态变化，进而对植被生长和生态系统功能构成重大威胁。然而，不同深度的土壤水分和土壤干旱对植被物候的影响仍有待深入探讨。本研究基于 1982 年至 2022 年的多层土壤水分（SM）和标准化土壤水分指数（SSMI）数据，分析了多层季节性土壤水分对植被物候的影响，并探讨了植被物候对多层土壤干旱的最佳响应时间。中亚干旱地区的多层SM和SSMI总体呈下降趋势。在春季，0-7 厘米层的 SM 与生长季节开始（SOS）之间的正相关性最为显著。在秋季，7-28 厘米层的 SM 与生长季结束（EOS）之间的正相关性最为突出。在春季、夏季和秋季，生长季长度（LOS）一般与 SM 呈负相关，夏季 SM 对 28-100 厘米层的影响最大。在 0-7 厘米、7-28 厘米和 28-100 厘米土层中，SOS、EOS 和 LOS 对干旱的最佳响应时间为 1-3 个月，而在 100-289 厘米土层中，最佳响应时间为 12-24 个月。这项研究阐明了中亚干旱地区不同土层深度的土壤水分对植被物候学的影响及其对干旱的最佳响应时间，为植被恢复、水资源管理和土地利用优化提供了重要启示。

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Changes in vegetation phenology and its response to different layers of soil moisture in the dry zone of Central Asia, 1982–2022

The intensification of global temperature rise has exacerbated the hydric imbalance in Central Asia, profoundly affecting the dynamics of soil moisture in the region and consequently posing a significant threat to vegetation growth and ecosystem functioning. However, the impacts of soil moisture and soil drought at varying depths on vegetation phenology remain to be thoroughly explored. This study, based on multi-layer soil moisture (SM) and standardized soil moisture index (SSMI) data from 1982 to 2022, analyzes the influence of multi-layer seasonal soil moisture on vegetation phenology and investigates the optimal response time of vegetation phenology to multi-layer soil drought. The multi-layer SM and SSMI in the arid regions of Central Asia show an overall declining trend. In spring, the positive correlation between SM at the 0–7 cm layer and the start of the growing season (SOS) is the most significant. During autumn, the positive correlation between SM at the 7–28 cm layer and the end of the growing season (EOS) is the most prominent. The length of the growing season (LOS) generally exhibits a negative correlation with SM in spring, summer, and autumn, with the greatest impact of summer SM at the 28–100 cm layer. The optimal response time of SOS, EOS, and LOS to drought in the 0–7 cm, 7–28 cm, and 28–100 cm soil layers is 1–3 months, while in the 100–289 cm soil layer, the optimal response time is 12–24 months. This study elucidates the effects of soil moisture at different soil depths on vegetation phenology and their optimal response times to drought in the arid regions of Central Asia, providing critical insights for vegetation restoration, water resource management, and land use optimization.

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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.