基于过程的河北平原农田生态系统稳定性评价

论文旨在探讨河北平原区农田生态系统稳定性的概念及内涵,构建稳定性评价指标体系并进行定量评价实证研究。首先,在总结生态系统领域有关稳定性研究相关成果的基础上,结合农田生态系统稳定性的特点,给出了农田生态系统稳定性的概念,并分析了其稳定性内涵。然后,以县域为研究单元构建了一个包括产量形成、投入产出、土壤生态等主导过程及生态环境效应4个方面22个具体指标的评价指标体系。最后,构建了区域农田生态系统稳定性评价的数学模型;并以雄县为例,运用所建模型进行评价,发现1995~2005年该区农田生态系统稳定性水平变化较大且呈阶段性发展,1995~1999年呈直线式逐年下降,2000~2005年呈波浪式发展,且投入产出过程对该区农田生态系统稳定性影响最大。

An Evaluation of Stability of Farmland Ecosystem Based on Processes in Hebei Plain

This paper aims at discussing the concept and connotation and evaluating index system of the stability of farmland ecosystem in Hebei Plain of China.First,based on the analysis of the research result of vulnerability in the field of ecosystem science,a concept of stability of farmland ecosystem which represents the characteristic of farmland ecosystem in Hebei Plain of China is formed.Then,the connotation about the stability of farmland ecosystem is probed.It is believed that the assessment index system of the farmland ecosystem stability includes four aspects of input-output process,yield formation process,soil ecological process and eco-environmental effect of farmland ecosystem and 22 concrete indices.Finally,the evaluating model of the stability of farmland ecosystem is built,and is applied to evaluate synthetically the status of stability of farmland ecosystem by taking Xiongxian county of Hebei as an example.It is found by validation that the stability of farmland ecosystem varies greatly,which presents a linear decreasing trend in 1995-1999 and wavy development in 2000-2005 with the greatest impact of input-output process.