Incorporating barriers restoration and stepping stones establishment to enhance the connectivity of watershed ecological security patterns

IF 4 2区 地球科学 Q1 GEOGRAPHY
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Abstract

Enhancing the connectivity of watershed ecological security patterns (ESPs) is increasingly emphasized for preserving ecological processes. Yet the importance of small-scale conservation and restoration was ignored and few studies have quantitatively compared the contribution of barriers restoration and stepping stones establishment to landscape connectivity. In this study, taking Dongting Lake Basin as an example, a watershed ESP was constructed based on the minimum cumulative resistance model and optimized through graded barriers restoration and different stepping stones establishment. Then the enhancement effects of landscape connectivity were compared to identify the most cost-effective optimization scheme. The results showed that the average of six schemes only protected and repaired less than 1% of the total area, which could enhance corridor connectivity by about 12% and 16% for average corridor length and corridor cumulative resistance respectively. For the optimal ESP, establishing natural patches near the midpoint of longer corridors as stepping stones, increased the probability of connectivity by 21.05%, and reduced the average corridor length and corridor cumulative resistance of corridor connectivity by 17.99% and 15.48% respectively. It also increased network circuitry index of network connectivity from 0.541 to 0.570, compared with the original ESP, indicating the possibility of successful ecological flow increased effectively. It can be concluded that the connectivity enhancement of stepping stones approach was better than barriers restoration approach. This study highlights the importance of small-scale barriers restoration and stepping stones establishment in enhancing landscape connectivity.

结合障碍修复和台阶石建设,加强流域生态安全模式的连通性
为保护生态过程,加强流域生态安全格局(ESP)的连通性日益受到重视。然而,小规模保护和恢复的重要性却被忽视,很少有研究定量比较屏障恢复和阶石建立对景观连通性的贡献。本研究以洞庭湖流域为例,基于最小累积阻力模型构建了流域ESP,并通过分级屏障修复和不同台阶石的建立对流域ESP进行了优化。然后比较了景观连通性的增强效果,以确定最具成本效益的优化方案。结果表明,六种方案平均只保护和修复了不到总面积的 1%,而对于平均廊道长度和廊道累积阻力而言,可分别提高约 12% 和 16% 的廊道连通性。对于最优静电除尘器,在较长走廊的中点附近建立自然斑块作为踏脚石,可使走廊连通的概率增加 21.05%,并使走廊连通的平均走廊长度和走廊累积阻力分别减少 17.99% 和 15.48%。同时,与原 ESP 相比,网络连通性的网络回路指数也从 0.541 提高到了 0.570,表明生态流成功的可能性得到了有效提高。由此可以得出结论,阶石法的连通性增强效果优于障碍修复法。本研究强调了小规模障碍修复和阶石建立在增强景观连通性方面的重要性。
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来源期刊
Applied Geography
Applied Geography GEOGRAPHY-
CiteScore
8.00
自引率
2.00%
发文量
134
期刊介绍: Applied Geography is a journal devoted to the publication of research which utilizes geographic approaches (human, physical, nature-society and GIScience) to resolve human problems that have a spatial dimension. These problems may be related to the assessment, management and allocation of the world physical and/or human resources. The underlying rationale of the journal is that only through a clear understanding of the relevant societal, physical, and coupled natural-humans systems can we resolve such problems. Papers are invited on any theme involving the application of geographical theory and methodology in the resolution of human problems.
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