排序方式： 共有3条查询结果，搜索用时 0 毫秒
1
1.
Soil erosion has become a major global environmental problem and is particularly acute on the Loess Plateau(LP), China. It is therefore highly important to control this process in order to improve ecosystems, protect ecological security, and maintain the harmonious relationship between humans and nature. We compared the effects of rainfall and land use(LU) patterns on soil erosion in different LP watersheds in this study in order to augment and improve soil erosion models. As most research on this theme has so far been focused on individual study areas, limited analyses of rainfall and LU patterns on soil erosion within different-scale watersheds has so far been performed, a discrepancy which might influence the simulation accuracies of soil erosion models. We therefore developed rainfall and LU pattern indices in this study using the soil erosion evaluation index as a reference and applied them to predict the extent of this process in different-scale watersheds, an approach which is likely to play a crucial role in enabling the comprehensive management of this phenomenon as well as the optimized design of LU patterns. The areas considered in this study included the Qingjian, Fenchuan, Yanhe, and Dali river watersheds. Results showed that the rainfall erosivity factor(R) tended to increase in these areas from 2006 to 2012, while the vegetation cover and management factor(C) tended to decrease. Results showed that as watershed area increased, the effect of rainfall pattern on soil erosion gradually decreased while patterns in LU trended in the opposite direction, as the relative proportion of woodland decreased and the different forms of steep slope vegetation cover became more homogenous. As watershed area increased, loose soil and craggy terrain properties led to additional gravitational erosion and enhanced the effects of both soil and topography. 相似文献
2.
山水林田湖草生态保护修复是保障国家生态安全的重要举措,科学合理的生态保护修复项目监测和绩效评价方法,有助于保障生态保护修复工程的顺利实施和生态保护修复成果的可持续发展。本研究采用文献综述和案例分析相结合的方法,论述了遥感技术在山水林田湖草生态保护修复项目监测和绩效评价中的具体应用。从关注区域生态系统格局和质量两方面出发,选择遥感数据获取的土地覆盖类型、植被长势、水质参数作为评价指标,整体实现了山水林田湖草各生态要素的监测;从维护和提升区域生态系统服务出发,选择水源涵养、水土保持、生态系统承载力等指标,论述了遥感数据在辅助山水林田湖草生态保护修复项目绩效评价中的作用。最后指出积极探索新的遥感数据挖掘方法,并结合遥感技术与传统的调查方法,有望形成更客观、更快速且具备可执行性的山水林田湖草生态保护修复项目监测及绩效评价体系。 相似文献
3.
山水林田湖草生态保护修复技术框架研究 总被引：1，自引：0，他引：1
面对当前严峻的资源环境与生态压力,习近平总书记提出了山水林田湖草生命共同体的理念,截至2019年底全国共开展了25个山水林田湖草生态保护修复工程试点。虽然已有工作取得了一定成效,但也存在保护修复目标不明确、整体性与系统性不足、人工干预的工程措施过度、缺乏动态监测评价、难以实现人与自然和谐共生等诸多问题。鉴此,本研究在梳理景观生态学、恢复生态学相关理论,基于自然的解决方案、适应性管理、社会-经济-自然复合生态系统以及生态系统服务等相关理念的基础上,构建了包含有区域(省)、景观、生态系统以及子项目4个层次的山水林田湖草生态保护修复技术框架,并提出了项目实施全程监测管理的技术要求,以期为推进山水林田湖草生命共同体的整体保护、系统修复、综合治理提供理论与技术支撑。 相似文献
1