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土壤侵蚀是陆地生态系统中广泛存在的地表过程,具有当地和异地两方面的生态环境和社会经济影响。土壤保持为人类社会提供防止土壤肥力下降和减少库塘淤积等效益。当前对异地土壤保持效益的计算大多基于当地土壤保持量、采用单一的泥沙输移比,忽视了泥沙输移比的尺度效应及其与流域特征和降雨等因素的时空变异相关的事实,缺乏对土壤保持效益空间传输的定量和显式表达。本文基于WATEM/SEDEM模型框架,通过流域侵蚀产沙和泥沙传输模拟,建立了评估当地和异地土壤保持效益的方法,量化了碾庄沟流域不同土地利用类型区土壤保持效益的输入和输出及其空间格局。该方法能识别土壤保持效益净供给区和净受益区,可建立起供给区和受益区之间定量化、空间直观的土壤保持效益传输联系,可为实施空间位置明确的生态补偿决策服务。
Soil erosion is a widespread surface process in terrestrial ecosystems, with both local and remote ecological and socio-economic impacts. Soil conservation provides human society with the benefits of preventing the decline of soil fertility and reducing pond sedimentation. At present, the calculation of soil conservation benefits based on local soil conservation is mostly based on the fact that the single sediment transport ratio neglects the scale effect of sediment transport ratio and its correlation with spatio-temporal variations of basin characteristics and rainfall. Lack of quantitative and explicit expression of the spatial transmission of soil conservation benefits. Based on the WATEM / SEDEM model framework, a method of assessing soil conservation benefits at both local and remote locations was established based on the model of erosion and sediment transport and sediment transport. The input and output of soil conservation benefits from different types of land use in the Zhuangzhuanggou Watershed were quantified. Its spatial pattern. The method can identify the net supply area and the net benefit area of soil conservation benefit, and establish a quantitative and spatial transmission relationship between soil conservation benefit between supply area and beneficiary area, which can be used to implement the ecological compensation decision service with clear spatial location.