[Comprehensive Ecosystem Service Changes and Their Drivers in the Middle Reaches of Jinsha River].

Q2 Environmental Science
Xiu Zhang, Xuan Zhang, Lei Cui, Hao Chen, Jia Song, Fan Wan, Chong Li
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引用次数: 0

Abstract

Hydropower development is an important starting point for China to implement the dual carbon strategy in the energy field in the new era, and the influence mechanism of a large-scale hydropower development mode with ecological priority on watershed ecosystem service has become complicated. Therefore, exploing the ecosystem services change under the influence of hydropower development is highly important. As one of the frequent anthropogenic activity areas in southwest China, the investigation on the impact of hydropower development on ecosystem service is developing from single factor and single process to multi-factor comprehensive ecosystem service functions. This study conducted a multi-scale analysis in the middle reaches of Jinsha River, a hydropower development base in southwest China, to quantitatively evaluate the spatio-temporal characteristics of water yield, carbon storage, and habitat quality before (2000) and after (2020) hydropower development using the InVEST model; to assess the three ecosystem services based on a comprehensive ecosystems service index (CESI) from the perspective of balanced development; and to investigate the mechanism of CESI change under hydropower development. The results indicated that: ① At the watershed level, water yield showed a decreasing trend (by 18.22%), whereas carbon storage (by 0.26%) and habitat quality (by 0.45%) showed a subtle increasing trend from 2000 to 2020. ② The three ecosystem services in the sub-watershed with different levels of hydropower development exhibited different changing characteristics: the three ecosystem services in sub-watersheds with higher levels of hydropower development decreased, whereas carbon storage and habitat quality in sub-watersheds without hydropower development increased. ③ The CESI showed a downward trend (by 8.13%), and pinpointed regions of increasing CESI were in the up and down reaches of the regions, whereas those of decreasing CESI were in the middle reaches of the regions. The sustained hot spots of CESI were located near the left side of the upstream and downstream of the main stream, and the sustained cold spots were mainly distributed in sub-watershed 21 and 23. ④ The △CESI were comprehensively influenced by the climate, land use, landscape pattern, and socio-economic changes, with the change in annual precipitation and the PD of water being the key drivers of △CESI, and the contribution rates were 89.4% and 3.2%, respectively. Moreover, the gross domestic production (GDP) change was found to be positively associated with the △CESI. We proposed to improve the comprehensive function of ecosystem services by reducing interference with sustained hotspots, considering the continuous cold point area as a priority for hydropower development, maintaining intensive urban development, and cultivating more concentrated arable land. This study provides support for the hydropower development planning of ecosystems.

[金沙江中游生态系统服务综合变化及其驱动因素]。
水电开发是新时期中国在能源领域实施双碳战略的重要抓手,生态优先的大规模水电开发模式对流域生态系统服务的影响机制变得复杂。因此,研究水电开发影响下的生态系统服务变化具有十分重要的意义。作为西南地区人类活动频繁的地区之一,水电开发对生态系统服务功能的影响研究正从单一因素、单一过程向多因素综合生态系统服务功能研究发展。以西南水电开发基地金沙江中游为研究对象,开展了多尺度分析,定量评价了该流域的产水量、碳储量、生态环境和生态环境的时空特征。基于平衡发展视角的综合生态系统服务指数(CESI)对3种生态系统服务功能进行了评价,并探讨了水电开发条件下CESI变化的机理。结果表明:①2000 - 2020年,流域水量呈下降趋势(下降18.22%),而碳储量和生境质量呈小幅上升趋势(下降0.26%);②水电开发程度不同的子流域3种生态系统服务功能呈现出不同的变化特征:水电开发程度高的子流域3种生态系统服务功能减少,未水电开发的子流域碳储量和生境质量增加。③CESI总体呈下降趋势(下降8.13%),CESI上升的区域集中在区域的上游和下游,CESI下降的区域集中在区域的中游。CESI的持续热点位于干流上下游左侧附近,持续冷点主要分布在流域21和流域23。④△CESI受气候、土地利用、景观格局和社会经济变化的综合影响,年降水量变化和水PD变化是△CESI的主要驱动因素,贡献率分别为89.4%和3.2%。此外,国内生产总值(GDP)的变化与△CESI呈正相关。提出减少对持续热点地区的干扰,将持续冷点地区作为水电优先开发区域,保持城市集约化发展,培育更集中的耕地,提高生态系统综合服务功能。本研究为生态系统水电开发规划提供了依据。
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
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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