水网平原地区耕地破碎化时空变化研究

Spatio-temporal variation of farmland fragmentation in water net plain area

【目的】耕地破碎化是影响中国农业生产效率和规模化经营的重要因素,研究其时空分布以及变化趋势对于地区的农业发展、提高耕地保护水平具有重要的实践意义。【方法】以浙江省嘉兴市为研究对象,计算了2009-2018年嘉兴市7个县级单位的耕地破碎化综合指数,从时间和空间两方面分析各县(市、区)耕地破碎化变化趋势和时空演变特征,并就其变化的驱动因素进行了理论分析。【结果】空间上,嘉兴市耕地破碎化呈现由中部向南北逐渐递减的趋势。在时间上,2009年各县(市、区)耕地破碎度综合指数的变异系数为0.040,变异系数逐渐增加至2014年的0.057。2012年嘉兴市开始大规模推进农村土地综合整治,改变了各县(市、区)耕地破碎化空间差异,2018年各县(市、区)耕地破碎化综合指数的变异系数下降至0.041,同时也减小了各县(市、区)耕地破碎化的空间差异。【结论】需进一步推进农村土地综合整治,创新完善整治模式,并将耕地的破碎化治理及耕地连片建设纳入耕地保护考核目标内容,以制度降低耕地破碎化程度。图2表2参21。

[Objective]To promote regional agricultural development,this study is aimed to conduct an investigation of the temporal and spatial distribution and change trend of farmland fragmentation,an important factor that affects the agricultural production efficiency and large-scale management in China.[Method]With Jiaxing City of Zhejiang Province selected as the research area where the comprehensive index of farmland fragmentation of 7 county-level units in Jiaxing City from 2009 to 2018 was calculated,this paper makes an analysis of the change trend and spatio-temporal evolution characteristics of farmland fragmentation in different counties as well as a theoretical analysis of the driving factors.[Result]Spatially,the fragmentation of farmland in Jiaxing City has deomonstrated a gradual decrease from the middle to the North and South.In terms of time,the coefficient of variation of the comprehensive index of farmland fragmentation was 0.040 in 2009 and gradually increased to 0.057 in 2014.In 2012,Jiaxing promoted the comprehensive rural land consolidation on a large scale,which changed the trend increasing farmland fragmentation and reduced the spatial difference of farmland fragmentaion in each county,the coefficient of variation of the comprehensive index of farmland fragmentation decreased to 0.041 by 2018.[Conclusion]It is necessary to further promote the comprehensive consolidation of rural land,innovate and improve the renovation mode and include the control of fragmentation and the promotion of connectivity of farmland as part of farmland protection assessment so as to reduce the fragmentation of farmland.[Ch,2 fig.2 tab.21 ref.].