基于能值理论的耕地质量评价研究——以河南省为例

A CASE STUDY ON HENAN PROVINCE: EVALUATION OF FARMLAND QUALITY BASED ON ENERGY VALUE THEORY

耕地质量评价是耕地质量管理及可持续利用的基础。基于能值理论,利用耕地投资回报率和压力系数分别衡量耕地的产出能力及可持续利用能力,建立了耕地质量评价模型,并用该模型测算了1999—2008年耕地质量指数动态变化和2008年各地市的耕地质量指数分布。结果表明,由于耕地生产投入回报率下降和压力系数上升,近10年来河南省耕地质量呈缓慢下降趋势;2008年耕地质量指数区域分异明显,主要是耕地压力系数区域差异显著,耕地投入回报率也有一定的影响。建议河南省应转变耕地能值投入结构,改善耕地生态环境,提高耕地生态系统的回馈产出能力;中北部经济相对发达的地市是耕地质量管理的重点区域。

Evaluation of farmland quality underpins quality management and sustainable development of farmland. This paper, based on energy value theory, applies farmland return on investment and pressure to weigh its production capability and sustainable utilization, to establish an evaluation model of farmland quality, which is employed to measure a dynamic change of farmland quality in 1999--2008 and quality index distribution in 2008. The results show a fall in return on investment and a rise in pressure leading to a slow descend in farmland quality in Henan province since the last decade. A clear regional differentiation in farmland quality index is reflected in 2008, which is induced by farmland pressure and less by return on farmland investment. This paper proposes a change in investment structure in farmland energy value, an improvement in ecological environment to increase the returu capability, and a key region in the central-northern Henan in farmland quality management, where is relatively developed in economy.