八大综合经济区绿色发展技术效率、绿色TFP增长及其空间差异、绿色发展绩效影响因素。研究方法:运用 US SBM Malmquist模型、Dagum基尼系数、FGLS与PCSE。研究发现:八大综合经济区绿色发展绩效水平整体偏低且呈现鲜明非均衡态势,绿色发...八大综合经济区绿色发展技术效率、绿色TFP增长及其空间差异、绿色发展绩效影响因素。研究方法:运用 US SBM Malmquist模型、Dagum基尼系数、FGLS与PCSE。研究发现:八大综合经济区绿色发展绩效水平整体偏低且呈现鲜明非均衡态势,绿色发展区域总体协同性比较弱;超变密度贡献是总体区域差异产生的主要来源;缩小区域间差异是破解绿色发展区域不均衡问题的关键;各项社会经济因素对八大综合经济区绿色发展绩效的差异性影响在很大程度上弱化了区域发展的协同性。研究创新:以八大综合经济区绿色发展绩效作为研究视角,综合运用 US SBM Malmquist模型、Dagum基尼系数以及面板数据模型,全面揭示八大综合经济区绿色发展绩效现状及其区域差异性。研究价值:传统经济发展绩效的测评忽略了资源与环境对经济发展的刚性约束以及经济新常态下“绿色GDP”与“绿色生产率”的新诉求;为缩小综合经济区绿色发展区域差距及加快推进我国区域绿色可持续协同发展提供重要的经验证据参考。展开更多
This paper analyzed the water-retention mechanism of feldspathic sandstone （fine-（〈 1 mm diam.） and gravel-sized （2-3 cm diam.） in Mu Us Sandy Land, Northwest China. The objective of this study is to study the e...This paper analyzed the water-retention mechanism of feldspathic sandstone （fine-（〈 1 mm diam.） and gravel-sized （2-3 cm diam.） in Mu Us Sandy Land, Northwest China. The objective of this study is to study the effect of feldspathic sandstone amendment on water retention in sandy land. The results showed that as the proportion of fine feldspathic sandstone in the sandy land soil increased, the soil texture changed from sand to silt loam, the capillary po- rosity gradually increased from 26.3% to 44.9%, and the soil saturated hydraulic conductivity decreased from 7.10 ram/rain to 0.07 mm/min. Feldspathic sandstone gravel formed micro-reservoirs in the sandy land soil, playing the role of a ＇water absorbent＇ and ＇water retaining agent＇ in sandy land. Amendment with feldspathic sandstone can increase water retention in the arable layer of sandy land by 67%. This study provides a theoretical basis for the amelioration of sandy land on a large scale. It can be concluded that amendment with feldspathic sandstone can improve the physical properties of sandy land soil and increase soil water retention.展开更多
文摘八大综合经济区绿色发展技术效率、绿色TFP增长及其空间差异、绿色发展绩效影响因素。研究方法:运用 US SBM Malmquist模型、Dagum基尼系数、FGLS与PCSE。研究发现:八大综合经济区绿色发展绩效水平整体偏低且呈现鲜明非均衡态势,绿色发展区域总体协同性比较弱;超变密度贡献是总体区域差异产生的主要来源;缩小区域间差异是破解绿色发展区域不均衡问题的关键;各项社会经济因素对八大综合经济区绿色发展绩效的差异性影响在很大程度上弱化了区域发展的协同性。研究创新:以八大综合经济区绿色发展绩效作为研究视角,综合运用 US SBM Malmquist模型、Dagum基尼系数以及面板数据模型,全面揭示八大综合经济区绿色发展绩效现状及其区域差异性。研究价值:传统经济发展绩效的测评忽略了资源与环境对经济发展的刚性约束以及经济新常态下“绿色GDP”与“绿色生产率”的新诉求;为缩小综合经济区绿色发展区域差距及加快推进我国区域绿色可持续协同发展提供重要的经验证据参考。
基金Under the auspices of Key Direction Program of Chinese Academy of Science(No.KZCX2-YW-Q06-03)MajorState Basic Research Development Program of China(No.2009CB421103)+1 种基金National Natural Science Foundation of China(No.41001050)Major Science and Technology Program for Water Pollution Control and Treatment(No.2012ZX07201004)
文摘This paper analyzed the water-retention mechanism of feldspathic sandstone （fine-（〈 1 mm diam.） and gravel-sized （2-3 cm diam.） in Mu Us Sandy Land, Northwest China. The objective of this study is to study the effect of feldspathic sandstone amendment on water retention in sandy land. The results showed that as the proportion of fine feldspathic sandstone in the sandy land soil increased, the soil texture changed from sand to silt loam, the capillary po- rosity gradually increased from 26.3% to 44.9%, and the soil saturated hydraulic conductivity decreased from 7.10 ram/rain to 0.07 mm/min. Feldspathic sandstone gravel formed micro-reservoirs in the sandy land soil, playing the role of a ＇water absorbent＇ and ＇water retaining agent＇ in sandy land. Amendment with feldspathic sandstone can increase water retention in the arable layer of sandy land by 67%. This study provides a theoretical basis for the amelioration of sandy land on a large scale. It can be concluded that amendment with feldspathic sandstone can improve the physical properties of sandy land soil and increase soil water retention.
