Department of Land Resources Management, Hohai University, No.8 Focheng West Road, Nanjing 211000, PR China.
Department of Land Resources Management, Hohai University, No.8 Focheng West Road, Nanjing 211000, PR China.
Sci Total Environ. 2020 May 15;717:137149. doi: 10.1016/j.scitotenv.2020.137149. Epub 2020 Feb 6.
Agricultural land use is a complicated systems engineering. Modern agriculture faces increasingly more risks. Managers should obtain reliable information to assist in decision-making through certain methods that allow them to achieve an economic, social, and ecological environment that is crucial in coordinating the development of agricultural land-use patterns. This study proposes a framework of an agricultural land-use decision support system (LDSS) based on ecological environmental constraints according to the DSS design philosophy, which provides a scientific basis for managers to allocate land resources. This framework of LDSS consists of a land quality assessment module, an eco-economic coupling module, and a land-use optimisation module. Firstly, it establishes a natural-society-economic land quality evaluation system to simulate the comprehensive benefit relationship of land use. Secondly, it analyses the risks of soil, water, and ecological security in the process of land use; simulates and reveals the mechanism of occurrence; and completes the correlation equation expression between natural-economic-social indictor and land use risk. Based on different scenarios design, the ecological environmental risk factors are used as constraints. Finally, the multi-objective linear programming method is employed to calculate the optimal comprehensive benefits of land use and optimal land-use structure based on the constraints of the ecological environment. Then the study takes Changsha County, a high-intensification, main grain-producing area in Central and South China, as a case area to demonstrate the feasibility of the framework of LDSS, and draws the highest comprehensive benefits and optimal structure of land use under the premise that the rural ecological environment conforms to national standards. Case study shows that the LDSS framework is feasible, easy to operate, and easy to promote. The research results can provide efficient and practical support for managers to allocate land resources and formulate sustainable land-use policies rationally.
农用地利用是一个复杂的系统工程。现代农业面临越来越多的风险。管理者应通过某些方法获取可靠信息，辅助决策，使农业土地利用模式的协调发展达到经济、社会和生态环境效益的统一。本研究提出了一个基于生态环境约束的农用地利用决策支持系统（LDSS）框架，根据 DSS 设计理念，为管理者分配土地资源提供了科学依据。该 LDSS 框架由土地质量评估模块、生态经济耦合模块和土地利用优化模块组成。首先，建立了自然-社会-经济土地质量评价体系，模拟土地利用的综合效益关系。其次，分析土地利用过程中的土壤、水和生态安全风险；模拟并揭示发生机制；完成自然-经济-社会指标与土地利用风险的相关方程表达。基于不同情景设计，将生态环境风险因素作为约束条件。最后，采用多目标线性规划方法，在生态环境约束下，计算土地利用的综合效益最优和土地利用结构最优。然后，以中国中南地区高强度、主粮产区的长沙县为案例区，验证 LDSS 框架的可行性，并得出农村生态环境符合国家标准的前提下土地利用的最高综合效益和最优结构。案例研究表明，LDSS 框架具有可行性、易于操作和推广。研究结果可为管理者合理分配土地资源和制定可持续土地利用政策提供高效实用的支持。
