基于动态因子的农田生态系统稳定性评价

Study on Farmland Ecosystem Stability Evaluation Based on Dynamic Factors

在分析自然生态系统与农田生态系统稳定性内涵差异的基础上,结合国内外已有的研究成果,给出了农田生态系统稳定性的概念,指出维持较高的系统产出是系统稳定性的基本特征,动态波动性是系统动态稳定性的典型特性;分析了农田生态系统模式,并在此基础上构建起区域农田生态系统稳定性评价的指标体系,分为区域生态环境质量、自然和人工投入、产量形成过程和经济社会过程4类共19项指标;利用本文提出的评价模型,以东莞市农田生态系统为例,从时间尺度上对其稳定性进行了评价,结果表明,东莞农田生态系统处于基本稳定状态,反映了评价模型的正确性.

Farmland ecological stability is the foundation of regional farmland ecological security and sustainable development.Based on analysis of differences between the natural ecosystem and farmland ecosystem,and combined with existing studies on the ecological stability in and out of China,the concept of farmland ecosystem stability was developed that keeping a relatively high output and dynamic fluctuation are the basic and typical characteristic,respectively,of the stability of the farmland ecosystem.The farmland ecosystem pattern was analyzed in order to construct an assessment index system,which included regional eco-environmental quality,artificial and natural input process,yield formation process and economy-society process and 19 concrete indices.Dongguan municipality was taken as a case study and its ecological stability situation of farmland from 1990 to 2004 was assessed quantitatively with the assessment indexes.The result showed that farmland ecosystem in Dongguan was at a stable status and indicated the correctness of the evaluation model.