基于粗糙集的农田生态系统生产力及稳定性研究——以河北雄县为例

Study on Agro-ecosystem Productivity and Productivity Stability Base on Rough Set Method——A Case Study in Xiongxian County

生态系统生产力和生产力稳定性是两个不同的概念,两者既相互影响又相互联系。在建立田块尺度耕地生产力空间稳定性的评价指标体系基础上,采用粗糙集方法,并结合GIS技术对河北省雄县耕地生产力及稳定性空间分布进行了分层次定量分析,结果表明:在不同生产力和生产力稳定性水平上,影响因素存在较大变化。生产力方面,雄县农田生态系统生产力空间波动的主控因素主要有排水条件、有机质、灌溉保证率、全氮、碱解氮和速效钾,随着生产力的不断升高,人为因素和自然因素对生产力的影响出现交替现象,具体表现为:生产力相对较低区人为因素和土壤自然属性共同作用,生产力较高区人为因素占主导地位;稳定性方面,农田生态系统生产力稳定性空间波动的主控因素有全氮、土体构型、盐渍化情况和有机质含量,在不同水平上主控因素对生产力稳定性的影响程度亦不相同,人为作用对雄县农田生态系统生产力稳定性的影响较大,土壤自然属性因素在中等稳定程度与人为因素相当。

The stability of ecosystem productivity and productivity are two different concepts,namely,they interact with each other.Based on the construction of the stability of territorial farmland system with full-scale,the rough set method,and a collection of GIS technology,quantitative analysis in the spatial distribution of productivity and stability of Xiongxian county,Hebei province was carried out.The results show that there is a big change of factors at different levels of the stability of ecosystem productivity and productivity.In the matter of productivity,the main factors controlling fluctuations of farmland ecosystem productivity in Xiongxian county is drainage conditions,soil organic matter,irrigation guarantee rate,soil total nitrogen,available nitrogen and potassium.Human factors and natural factors impacting on the productivity of the phenomenon appear alternately with the productivity rising.Human factors and the natural properties of soil are interacting in relatively low productivity areas and human factors are dominant in higher productivity areas.In the matter of stability of productivity,the stability of agro-ecosystem productivity controlling factors of space fluctuations are mainly nitrogen,soil configuration,saline conditions and organic matter.Controlling factors at different levels on the stability of the impact on productivity is not the same.Overall,the human role in stability of farmland ecosystem productivity of the Xiongxian county is the largest and natural properties of soil stability factor in the middle level is comparative with the human factors.