摘要
运用SBM-undesirable模型对西安市2004—2014年都市农业生态效率时空演变进行了分析。结果表明:①西安市都市农业生态效率呈现下降趋势,从2004年的0.881下降到2014年的0.819,相对DEA有效从2004年的7个区县下降到2014年的6个区县;西安市都市农业生态效率空间差异整体上呈现逐渐扩大趋势,从2004年的0.189扩大到2014年的0.234。②研究时段内,灞桥区、雁塔区、阎良区、长安区、蓝田县都市农业的生态效率处于良好状态,其余5个区县较多年份的都市农业的生态效率低下;不同地区不同年份效率低下的原因不同,主要是科技资源及管理要素未得到充分利用以及投入规模存在冗余。③2014年未央区、临潼区、周至县、户县的农业总产值冗余率为零,而投入要素和面源污染均存在不同程度冗余,表明这4个区县都市农业生态效率低下的原因不是期望产出不足,而是投入资源要素得不到充分利用及由此引起的环境污染。
The spatiotemporal evolution of Xi'an urban agriculture' s eco-efficiency between 2004--2014 was analyzed by using SBM-undesirable model. The results were as follows: ( 1 ) Its coo-efficiency presented a downward trend, decreasing from 0.881 in 2004 to 0.819 in 2014, the number of the relative DEA effectiveness' districts/counties reduced from 7 in 2004 to 6 in 2014, and the space difference in the eco-efficieney as a whole was gradually increased from 0. 189 in 2004 to 0. 234 in 2014. (2)In terms of eco-efficiency between 2004- 2014,Baqiao District,Yanta District, Yanliang District, Chang' an District and Lantian County were good, but other 5 districts/counties were poor,and the factors leading to poor eco-efficieney were different in different areas and various years. The major factors were the underused technical and management resources and the redundant investment scale. (3)In 2014 Weiyang District, Lintong District, Zhouzhi County and Hu County were zero in redundancy rate of total agricultural output value, but among them there were different degrees of redundancy in inputs and non-point source pollution, indicating that the causes leading to their low eco-efficiency were not inadequate in expected output but there were underused investment resources and thus produced environmental pollution.
出处
《上海农业学报》
CSCD
2017年第3期130-135,共6页
Acta Agriculturae Shanghai