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Coupling a land use model and an ecosystem model for a crop-pasture zone

机译：农牧交错带土地利用模型与生态系统模型的耦合

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This paper describes the development of a land use model coupling ecosystem processes. For a given land use pattern in a region, a built-in regional ecosystem model (TESim) simulates leaf physiology of plants, carbon and nitrogen dynamics, and hydrological processes including runoff generation and run-on re-absorption, as well as runoff-induced soil erosion and carbon and nitrogen loss from ecosystems. The simulation results for a certain period from 1976 to 1999 were then used to support land use decisions and to assess the impacts of land use changes on environment. In the coupling model, the land use type for a land unit was determined by optimization of a weighted suitability derived from expert knowledge about the ecosystem state and site conditions. The model was applied to the temperate crop-pasture band in northern China (CCPB) to analyze the interactions between land use and major ecosystem processes and functions and to indicate the added value of the feedbacks by comparing simulations with and without the coupling and feedbacks between land use module and ecosystem processes. The results indicated that the current land use in CCPB is neither economical nor ecologically judicious. The scenario with feedbacks increased NPP by 46.78 g C m(-2) a(-1), or 32.23% of the scenario without feedbacks, also decreased soil erosion by 0.65 kg m(-2) a(-1), or 23.13%. Without altering the regional land use structure (proportions of each land use type). The system developed in this study potentially benefits both land managers and researchers.
机译：本文描述了结合生态系统过程的土地利用模型的开发。对于某个地区的特定土地利用模式，内置的区域生态系统模型（TESim）可以模拟植物的叶片生理，碳和氮动态以及水文过程，包括径流的产生和径流的再吸收以及径流导致土壤侵蚀以及生态系统的碳氮损失。然后将1976年至1999年期间的模拟结果用于支持土地使用决策并评估土地使用变化对环境的影响。在耦合模型中，土地单位的土地利用类型是通过优化加权适宜性来确定的，该加权适宜性是从有关生态系统状态和地点条件的专家知识中得出的。该模型被应用于中国北方的温带农牧交错带（CCPB），以分析土地利用与主要生态系统过程和功能之间的相互作用，并通过比较模拟与不考虑耦合与否之间的耦合和反馈来表明反馈的附加值。土地利用模块和生态系统过程。结果表明，目前CCPB的土地利用既不经济也不具有生态明智性。有反馈的情况下NPP增加了46.78 g C m（-2）a（-1），占无反馈的情况下的32.23％，土壤侵蚀也减少了0.65 kg m（-2）a（-1）或23.13 ％。无需更改区域土地使用结构（每种土地使用类型的比例）。本研究开发的系统可能使土地管理人员和研究人员受益。

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