为更好地引导云南山区宜耕未利用地的开发,该文以云南省典型的山区县―弥渡县为例,将GIS(geographical information system,GIS)空间分析技术、层次分析法(analytical hierarchy process,AHP)及特尔菲法(Delphi)相结合,分别构建宜耕未...为更好地引导云南山区宜耕未利用地的开发,该文以云南省典型的山区县―弥渡县为例,将GIS(geographical information system,GIS)空间分析技术、层次分析法(analytical hierarchy process,AHP)及特尔菲法(Delphi)相结合,分别构建宜耕未利用地开发适宜性评价模型、新增耕地指数及补充耕地潜力模型、宜耕未利用地开发潜力分区评价模型,对云南山区宜耕未利用地开发适宜性与潜力分区进行了分析。结果表明,研究区宜耕未利用地开发适宜性分为4个等级:最适宜、中等适宜、勉强适宜、不适宜,面积分别为71.21、1177.39、1681.00和62.00hm2,分别占研究区总面积的2.38%、39.36%、56.19%、2.07%。研究区宜耕未利用地实际开发潜力为1248.60hm2,预计新增耕地面积977.45hm2。潜力分区结果表明,研究区可划分为5个潜力区和1个非潜力区。其中,Ⅰ级潜力区实际开发潜力164.97hm2,可新增耕地144.21hm2;Ⅱ级潜力区实际开发潜力53.38hm2,可新增耕地46.66hm2;Ⅲ级潜力区实际开发潜力210.64hm2,可新增耕地164.01hm2;Ⅳ级潜力区实际开发潜力773.93hm2,可新增耕地590.11hm2;Ⅴ级潜力区实际开发潜力45.68hm2,可新增耕地32.46hm2。研究结果的应用表明,该种方法得出的适宜性评价结果、新增耕地测算结果及潜力分区结果与当地实际较为吻合。展开更多
Land cover in the Chinese Loess Plateau has undergone dramatic changes since the late 1980s.Revealing the trend in land cover change and eco-environmental quality response of different geomorphic units in this stage i...Land cover in the Chinese Loess Plateau has undergone dramatic changes since the late 1980s.Revealing the trend in land cover change and eco-environmental quality response of different geomorphic units in this stage is a realistic requirement for promoting sustainable development of the Chinese Loess Plateau.Based on the data of geomorphic units and land cover in 1990,2000,2010 and 2018 of the Chinese Loess Plateau,we studied the trend of land cover change and eco-environmental quality response of different geomorphic units by using a significance index of land cover change,a proportion index of land cover change and an eco-environmental response model.The results indicated that from 1990 to 2018,the areas of forestland and construction land substantially increased,whereas those of cropland,grassland,wetland and unused land considerably decreased.Land cover change exhibited large geomorphic differences,and the main conversion of land cover was from cropland into other land types.Unstable trend of land cover change in the loess tablelands and sandy loess hills declined,whereas the unstable trends in the other geomorphic units enhanced.Eco-environmental quality varied among different geomorphic units.The expansion of construction land and degradation of forestland,grassland and wetland resulted in the deterioration of eco-environmental quality.The conversion of cropland and unused land into forestland and grassland,and the conversion of grassland into forestland were the main factors that drove the improvement of eco-environmental quality.The findings of this study may provide theoretical reference and support decision making for the optimization of land use structure and the improvement of eco-environmental quality on the Chinese Loess Plateau.展开更多
文摘为更好地引导云南山区宜耕未利用地的开发,该文以云南省典型的山区县―弥渡县为例,将GIS(geographical information system,GIS)空间分析技术、层次分析法(analytical hierarchy process,AHP)及特尔菲法(Delphi)相结合,分别构建宜耕未利用地开发适宜性评价模型、新增耕地指数及补充耕地潜力模型、宜耕未利用地开发潜力分区评价模型,对云南山区宜耕未利用地开发适宜性与潜力分区进行了分析。结果表明,研究区宜耕未利用地开发适宜性分为4个等级:最适宜、中等适宜、勉强适宜、不适宜,面积分别为71.21、1177.39、1681.00和62.00hm2,分别占研究区总面积的2.38%、39.36%、56.19%、2.07%。研究区宜耕未利用地实际开发潜力为1248.60hm2,预计新增耕地面积977.45hm2。潜力分区结果表明,研究区可划分为5个潜力区和1个非潜力区。其中,Ⅰ级潜力区实际开发潜力164.97hm2,可新增耕地144.21hm2;Ⅱ级潜力区实际开发潜力53.38hm2,可新增耕地46.66hm2;Ⅲ级潜力区实际开发潜力210.64hm2,可新增耕地164.01hm2;Ⅳ级潜力区实际开发潜力773.93hm2,可新增耕地590.11hm2;Ⅴ级潜力区实际开发潜力45.68hm2,可新增耕地32.46hm2。研究结果的应用表明,该种方法得出的适宜性评价结果、新增耕地测算结果及潜力分区结果与当地实际较为吻合。
基金funded by the Special Project of the Ministry of Science and Technology of China(2014FY210100)the National Key Research and Development Program of China(2018YFD1100101)the National Natural Science Foundation of China(41971204)
文摘Land cover in the Chinese Loess Plateau has undergone dramatic changes since the late 1980s.Revealing the trend in land cover change and eco-environmental quality response of different geomorphic units in this stage is a realistic requirement for promoting sustainable development of the Chinese Loess Plateau.Based on the data of geomorphic units and land cover in 1990,2000,2010 and 2018 of the Chinese Loess Plateau,we studied the trend of land cover change and eco-environmental quality response of different geomorphic units by using a significance index of land cover change,a proportion index of land cover change and an eco-environmental response model.The results indicated that from 1990 to 2018,the areas of forestland and construction land substantially increased,whereas those of cropland,grassland,wetland and unused land considerably decreased.Land cover change exhibited large geomorphic differences,and the main conversion of land cover was from cropland into other land types.Unstable trend of land cover change in the loess tablelands and sandy loess hills declined,whereas the unstable trends in the other geomorphic units enhanced.Eco-environmental quality varied among different geomorphic units.The expansion of construction land and degradation of forestland,grassland and wetland resulted in the deterioration of eco-environmental quality.The conversion of cropland and unused land into forestland and grassland,and the conversion of grassland into forestland were the main factors that drove the improvement of eco-environmental quality.The findings of this study may provide theoretical reference and support decision making for the optimization of land use structure and the improvement of eco-environmental quality on the Chinese Loess Plateau.
