摘要
全球变化背景下的适应性研究引起了广泛关注。南方丘陵区是典型的水稻农业区,研究其农业生态系统适应性尤为重要。采用主成分分析法对衡阳盆地农业生态系统适应能力进行了定量研究,分析不同适应能力区的适应性主要驱动因子。结果表明:适应能力的分布规律为衡阳市区最高,各县域适应能力呈现出盆地中部低、四周高的分布规律。不同适应能力区适应性驱动因子各异,高适应能力区主要驱动因子是经济条件,水热配合条件和灌溉设施是较高适应能力区的主要驱动因子,低适应能力区的主要驱动因子是人口规模和水土保持,热量和地形条件是极低适应能力区的主要驱动因子。高适应能力区因以农药和化肥的施用量为主要驱动因子具有短暂性,较高适应能力区以良好的水热配合条件和灌溉设施作为驱动因子具有可持续性,因而较高适应能力区的发展潜力超过高适应能力区。
Adaptability is the response to external pressures or actions that people make efforts to reduce the adverse effects caused by global change with the aim of harmoniously inhabiting the environment. In studies focused on global change,adaptability has attracted great attention. There have been many studies on the ecological adaptability of plants under global change. The model of water ecological adaptability of upland crops has been discussed, and the eco-environment adaptability under changing climates in the past decade has been investigated. However,little research has been conducted on agricultural ecosystem adaptability（ AEA）. Agricultural ecosystem adaptability is affected by the natural environment,as well as by social and economic factors. Different factors have different driving or restraining effects on AEA values. The rice farming regions of the hilly area in the Hengyang basin in southern China is the basis for our AEA study. Our study on AEA values is quantitative and applies principal component analysis to analyze the main driving factors affecting adaptability in the different regions of our study area. Based on the calculation of the size of the driving force and AEA values,we analyzed the adaptability of the different regions. The AEA concept helps maintain sustainable agricultural development.Sustainable agricultural development is more likely to recover quickly from environmental disasters（ such as floods or droughts） or economic（ i. e. poor,lack of food,fluctuations in commodity prices） crises. Based on natural,social andeconomic factors,we establish the AEA indexes for different regions in the Hengyang Basin. Our findings show that AEA is highest in Hengyang. In the other regions,the central parts of the basin have low adaptability and the surrounding regions have high adaptability. Good economic conditions are the main driving factors of a high AEA,and good hydrothermal and irrigation systems induce high adaptability. Hengyang is the economic,political and cultural center of the
出处
《生态学报》
CAS
CSCD
北大核心
2015年第6期1991-2002,共12页
Acta Ecologica Sinica
基金
衡阳市社会科学基金项目(2012B47)
湖南省教育厅科研项目(12C0531)
国家自然科学基金项目(41171075)
湖南省"十二五"重点建设学科人文地理资助项目
关键词
农业生态系统
适应能力
驱动因子
主成分分析
衡阳盆地
agricultural ecosystems
adaptability
driving factors
principal component analysis
Hengyang Basin
