西南喀斯特流域沉积物连通性的年变化

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-05-27 DOI:10.1016/j.catena.2025.109173

Si Cheng , Xingxiu Yu , Zhenwei Li , Liangxia Duan , Xianli Xu , Kelin Wang

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引用次数: 0

摘要

泥沙连通性反映了泥沙源和汇之间的连通性，有助于理解土壤侵蚀和泥沙输运过程。然而，气候因子和植被恢复对沉积物连通性的潜在影响尚未得到充分认识，特别是在石漠化严重、生态环境脆弱的西南喀斯特地区。本研究旨在量化6个典型喀斯特流域在气候变化与植被恢复耦合影响下的连通性指数（IC）、产流产沙变化。在2000 ~ 2019年期间收集了年度气候、植被、土地利用、土壤、径流和泥沙产量数据。基于源汇景观指数，计算了集成电路的参数。采用偏最小二乘结构方程模型（PLS-SEM）定量分析了气候变化和植被恢复对土壤养分、径流和产沙的影响。结果表明，2000 ~ 2019年，平均IC值在2.10 ~ 2.97之间，没有明显的下降趋势。PLS-SEM分析表明，气候和植被因子解释了1 ~ 7%的IC值变化和53 ~ 90%的径流动态。气候因子、植被动态、径流和IC值共同解释了产沙量变化的21% ~ 67%。这些研究结果有助于理解土壤有机质含量的时间变化规律，对喀斯特地区生态恢复和输沙控制具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Annual variation in sediment connectivity in karst watersheds of southwest China

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Annual variation in sediment connectivity in karst watersheds of southwest China

Sediment connectivity reflects the connectivity between sediment sources and sinks and contributes to understanding soil erosion and sediment transport processes. However, the potential effects of climatic factors and vegetation restoration on sediment connectivity have not been fully recognized, especially in the karst area of southwest China, which has a serious rocky desertification and fragile ecological environment. This study aims to quantify the connectivity index (IC), runoff, and sediment yield changes induced by the coupling impacts of climate change and vegetation restoration in six typical karst watersheds. Annual climate, vegetation, land use, soil, runoff, and sediment yield data were collected during 2000 ∼ 2019. The parameters of IC were calculated based on the source-sink landscape index. The Partial least squares structural equation model (PLS-SEM) was used to quantify the impacts of climate change and vegetation restoration on changes in IC, runoff, and sediment yield. The results show that the average IC value ranged from 2.10 to 2.97 during 2000 ∼ 2019, with an insignificant decreasing trend. PLS-SEM analysis shows that climatic and vegetation factors explained 1 ∼ 7 % of the changes in IC values and 53 %∼90 % of the runoff dynamics. Climate factors, vegetation dynamics, runoff, and IC values together explained 21 %∼67 % of the variations in sediment yield. These results can facilitate understanding the temporal variation in IC and are significant for ecological restoration and sediment delivery control in karst areas.

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.