Integrating land-water-people connectivity concepts across disciplines for co-design of soil erosion solutions
Integrating land-water-people connectivity concepts across disciplines for co-design of soil erosion solutions
复制标题
整合跨学科的土地-水-人连通性概念，共同设计土壤侵蚀解决方案
DOI：
10.1002/ldr.3791
复制
发表时间：
2020
影响因子：
4.7
通讯作者：
Blake W
中科院分区：
文献类型：
--
作者：
Blake W
东非的土壤资源正因侵蚀而迅速枯竭，威胁到该区域的粮食、水和生计安全。在这里，我们展示了如何整合的证据，从自然和社会科学支持社区主导的土地管理变化在北方坦桑尼亚的农牧社区。侵蚀风险和范围的地理空间分析（基于对3.6平方公里子流域的无人机调查）显示，最近转换的土地的细沟密度比已建立的缓慢形成的梯田高出约12倍（987 ± 840 m2 ha − 1 vs. 79 ± 110 m2 ha −1）。坡长和地块之间的连通性是发展细沟网络的关键因素，而不是斜坡本身，其中坡长是由新形成的地块之间的弱边界增强。侵蚀的证据，支持沟通的“过程”和“结构”水文连通性，与当地的环境知识，参与性社区讲习班。在缓慢形成的梯田开发的早期阶段，对山坡规模的细沟侵蚀风险的关键时间窗口的论证，促进了社区主导的植树和草种播种计划，以减轻水土流失。这是基于农民对在社区和地区两级建立有效治理机制的必要性的理解，以使社区主导的行动得到有效实施。该研究展示了综合和跨学科的“上坡下坡”思维对应对全球土壤侵蚀挑战的广泛影响。
Soil resources in East Africa are being rapidly depleted by erosion, threatening food, water and livelihood security in the region. Here we demonstrate how the integration of evidence from natural and social sciences has supported a community‐led change in land management in an agro‐pastoral community in northern Tanzania. Geospatial analysis of erosion risk and extent (based on a drone survey across a 3.6 km2sub‐catchment) revealed that recently converted land had ca 12‐times greater rill density than established slow‐forming terraced plots (987 ± 840 m2ha−1vs. 79 ± 110 m2ha−1). Slope length and connectivity between plots were key factors in the development of rill networks rather than slope per se wherein slope length was augmented by weak boundaries between newly formed plots. Erosion evidence, supported by communication of 'process' and 'structural' hydrological connectivity, was integrated with local environmental knowledge within participatory community workshops. Demonstration of the critical time window of hillslope‐scale rill erosion risk during early phases of slow‐forming terrace development catalysed a community‐led tree planting and grass seed sowing programme to mitigate soil erosion by water. This was grounded in an implicit farmer understanding of the need for effective governance mechanisms at both community and District levels, to enable community‐led actions to be implemented effectively. The study demonstrates the wide‐reaching impact of integrated and interdisciplinary 'upslope‐downslope' thinking to tackle global soil erosion challenges.