Earlier vegetation green-up is intensifying hydrological drought in the Tianshan Mountain basins

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-03-22 DOI:10.1016/j.ejrh.2025.102321

Lilin Zheng , Ruishan Chen , Jianhua Xu , Yinshuai Li , Nan Jia , Xiaona Guo

{"title":"Earlier vegetation green-up is intensifying hydrological drought in the Tianshan Mountain basins","authors":"Lilin Zheng , Ruishan Chen , Jianhua Xu , Yinshuai Li , Nan Jia , Xiaona Guo","doi":"10.1016/j.ejrh.2025.102321","DOIUrl":null,"url":null,"abstract":"<div><h3>Study region</h3><div>Two inland basins in the Tianshan Mountains: the Huangshui Basin (HSB) and the Kashi Basin (KSB).</div></div><div><h3>Study focus</h3><div>Earlier green-up driven by climate warming can profoundly alter hydrological processes. However, the isolated impact of phenological changes on hydrological dynamics, independent of climatic factors, remains largely unexplored. To address this gap, we quantified the contributions of earlier green-up to evapotranspiration (ET) and basin streamflow by developing a framework that integrates an NDPI-based phenology model with the RHESSys eco-hydrological model.</div></div><div><h3>New hydrological insights for the region</h3><div>Between 2001 and 2020, the start of the growing season (SOS) advanced at rates of 1.02 days/year in HSB and 0.97 days/year in KSB, while changes in the end of the growing season were minimal (0.17 and − 0.12 days/year, respectively). In HSB, each one-day advancement in green-up increased ET by 2.22 mm and reduced streamflow discharge by 2.35 million m³. In contrast, in KSB, a one-day advancement in green-up resulted in a more significant increase in ET (11.22 mm) and a more substantial reduction in streamflow discharge (58.24 million m³). KSB's westward-facing topography facilitates the inflow of warm, humid Atlantic air, contributing to a more humid climate, higher vegetation cover, and an earlier SOS compared to HSB. These findings highlight the importance of incorporating phenological dynamics into eco-hydrological assessments to develop effective climate adaptation strategies for inland mountain basins.</div></div>","PeriodicalId":48620,"journal":{"name":"Journal of Hydrology-Regional Studies","volume":"59 ","pages":"Article 102321"},"PeriodicalIF":4.7000,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hydrology-Regional Studies","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214581825001454","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"WATER RESOURCES","Score":null,"Total":0}

引用次数: 0

Abstract

Study region

Two inland basins in the Tianshan Mountains: the Huangshui Basin (HSB) and the Kashi Basin (KSB).

Study focus

Earlier green-up driven by climate warming can profoundly alter hydrological processes. However, the isolated impact of phenological changes on hydrological dynamics, independent of climatic factors, remains largely unexplored. To address this gap, we quantified the contributions of earlier green-up to evapotranspiration (ET) and basin streamflow by developing a framework that integrates an NDPI-based phenology model with the RHESSys eco-hydrological model.

New hydrological insights for the region

Between 2001 and 2020, the start of the growing season (SOS) advanced at rates of 1.02 days/year in HSB and 0.97 days/year in KSB, while changes in the end of the growing season were minimal (0.17 and − 0.12 days/year, respectively). In HSB, each one-day advancement in green-up increased ET by 2.22 mm and reduced streamflow discharge by 2.35 million m³. In contrast, in KSB, a one-day advancement in green-up resulted in a more significant increase in ET (11.22 mm) and a more substantial reduction in streamflow discharge (58.24 million m³). KSB's westward-facing topography facilitates the inflow of warm, humid Atlantic air, contributing to a more humid climate, higher vegetation cover, and an earlier SOS compared to HSB. These findings highlight the importance of incorporating phenological dynamics into eco-hydrological assessments to develop effective climate adaptation strategies for inland mountain basins.

查看原文本刊更多论文

天山盆地植被提前绿化加剧了水文干旱

研究区域天山两大内陆盆地：湟水盆地（HSB）和喀什盆地（KSB）。研究重点：气候变暖导致的早期绿化可以深刻地改变水文过程。然而，物候变化对水文动态的孤立影响，独立于气候因素，在很大程度上仍未被探索。为了解决这一差距，我们通过开发一个框架，将基于ndpi的物候模型与RHESSys生态水文模型相结合，量化了早期绿化对蒸散发（ET）和流域流量的贡献。从2001年到2020年，生长季开始（SOS）的速度在HSB和KSB分别为1.02天和0.97天/年，而生长季结束的变化最小（分别为0.17天和- 0.12天/年）。在HSB，绿化率每提高一天，ET增加2.22 mm，流量减少235万m³。相比之下，在KSB，绿化期提前一天导致ET的显著增加（11.22 mm）和更大幅度的流量减少（5824万m³）。KSB的西向地形有利于温暖潮湿的大西洋空气的流入，与HSB相比，有助于形成更潮湿的气候，更高的植被覆盖率和更早的SOS。这些发现强调了将物候动力学纳入生态水文评估的重要性，以制定有效的内陆山地盆地气候适应战略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.