大规模农业人口向城镇及第二、三产业转移,引起其他农业生产要素改变,最终影响耕地利用效率。本文以江西省11个地级市为研究区域,运用超效率EBM(Epsilon Based Measure)模型测度2007-2016年江西省各地市耕地利用效率,通过面板门槛模型...大规模农业人口向城镇及第二、三产业转移,引起其他农业生产要素改变,最终影响耕地利用效率。本文以江西省11个地级市为研究区域,运用超效率EBM(Epsilon Based Measure)模型测度2007-2016年江西省各地市耕地利用效率,通过面板门槛模型以农业转移人口占农业人口比重为门槛变量,分析农业人口转移对耕地利用效率的影响。研究表明:考察期内江西省各地市农业转移人口与耕地利用效率均呈上升趋势,且区域差异显著;2016年江西省大多数地市农业人口转移对耕地利用效率的影响表现出门槛效应,在门槛值(0.428)前后,农业人口转移始终促进耕地利用效率提升,但跨越门槛值后其影响系数减小,由0.5089降至0.2495,促进作用减弱51%。可按农业人口转移程度是否跨越门槛值进行分区,针对不同区域提出差异化的耕地利用效率提升对策。展开更多
The excessive expansion of urbanized areas has resulted in haphazard land utili- zation, immoderate consumption of superior agricultural land and water resources, significant fragmentation of agricultural landscape, a...The excessive expansion of urbanized areas has resulted in haphazard land utili- zation, immoderate consumption of superior agricultural land and water resources, significant fragmentation of agricultural landscape, and gradual deterioration of the agro-ecological en- vironment. Combined, these factors cause poor land use efficiency. Under these circum- stances, comprehensively assessing land use efficiency for urban agriculture is a key issue in land use research. Currently, evaluation methods for agricultural land use efficiency narrowly concentrate on aspects of economic input and output. However, urban agro-ecosystems can provide diverse economic, social, and ecological services and functions. In particular, the social and ecological services and functions originating from agricultural land, which have a higher value than economic services, play a significant role in ensuring regional social, eco- logical, and environmental security. However, recent research has rarely taken these benefits into consideration. Therefore, land use value has been greatly underestimated, which has resulted in mishandled and poor land use policies. In this study, we apply Landsat imagery and social and economic statistical data for the Xi＇an metropolitan zone （XMZ） to investigate agricultural multi-functionality. We develop an evaluation framework for urban agricultural land use efficiency and identify agro-ecosystem services and functions as important outputs from agricultural land. The land use efficiency of urban agriculture is then evaluated using ecosystem services models, providing a mechanism for assessing spatial-temporal changes in land use efficiency in the XMZ from 1999 to 2015. Four important conclusions are reached from this analysis. First, the rapid urbanization and agricultural transformation from traditional cereal cultivation to modern urban agriculture has resulted in steadily increasing costs, out- puts, and land use efficiency of urban agriculture. The total output value increased 41% and land use effici展开更多
文摘大规模农业人口向城镇及第二、三产业转移,引起其他农业生产要素改变,最终影响耕地利用效率。本文以江西省11个地级市为研究区域,运用超效率EBM(Epsilon Based Measure)模型测度2007-2016年江西省各地市耕地利用效率,通过面板门槛模型以农业转移人口占农业人口比重为门槛变量,分析农业人口转移对耕地利用效率的影响。研究表明:考察期内江西省各地市农业转移人口与耕地利用效率均呈上升趋势,且区域差异显著;2016年江西省大多数地市农业人口转移对耕地利用效率的影响表现出门槛效应,在门槛值(0.428)前后,农业人口转移始终促进耕地利用效率提升,但跨越门槛值后其影响系数减小,由0.5089降至0.2495,促进作用减弱51%。可按农业人口转移程度是否跨越门槛值进行分区,针对不同区域提出差异化的耕地利用效率提升对策。
基金National Natural Science Foundation of China, No.41271550 Humanities and Social Sciences Project of Ministry of Education in the West and the Frontier Areas, No. 12XJC790003
文摘The excessive expansion of urbanized areas has resulted in haphazard land utili- zation, immoderate consumption of superior agricultural land and water resources, significant fragmentation of agricultural landscape, and gradual deterioration of the agro-ecological en- vironment. Combined, these factors cause poor land use efficiency. Under these circum- stances, comprehensively assessing land use efficiency for urban agriculture is a key issue in land use research. Currently, evaluation methods for agricultural land use efficiency narrowly concentrate on aspects of economic input and output. However, urban agro-ecosystems can provide diverse economic, social, and ecological services and functions. In particular, the social and ecological services and functions originating from agricultural land, which have a higher value than economic services, play a significant role in ensuring regional social, eco- logical, and environmental security. However, recent research has rarely taken these benefits into consideration. Therefore, land use value has been greatly underestimated, which has resulted in mishandled and poor land use policies. In this study, we apply Landsat imagery and social and economic statistical data for the Xi＇an metropolitan zone （XMZ） to investigate agricultural multi-functionality. We develop an evaluation framework for urban agricultural land use efficiency and identify agro-ecosystem services and functions as important outputs from agricultural land. The land use efficiency of urban agriculture is then evaluated using ecosystem services models, providing a mechanism for assessing spatial-temporal changes in land use efficiency in the XMZ from 1999 to 2015. Four important conclusions are reached from this analysis. First, the rapid urbanization and agricultural transformation from traditional cereal cultivation to modern urban agriculture has resulted in steadily increasing costs, out- puts, and land use efficiency of urban agriculture. The total output value increased 41% and land use effici
