Coal cities are the main part of the resource-based cities in China, and the benign development of coal cities' spatial structure has a direct impact on these cities' future economic and social development, as...Coal cities are the main part of the resource-based cities in China, and the benign development of coal cities' spatial structure has a direct impact on these cities' future economic and social development, as well as the urban residents' welfare. Land use fragmentation is the most typical morphological characteristic of the coal city's spatial structure development. In this paper, Pingdingshan City of Henan Province in China is taken as an example. Through empirical analysis, the urban spatial structure development processes of a typical coal resource-based city in its mature period are illustrated, and the formation reasons and potential mechanism behind coal city land use fragmentation are explored, and the measurement method of land use fragmentation degree of the coal city is put forward. On the above basis, the appropriate adjustment strategies and methods aimed at the coal city spatial structure are found out and given. This study is a good guideline and reference for the spatial structure planning and land use planning of the coal city during the mature and declining period, which is of great help to the sustainable development and industrial structure transformation of the coal city. It also has certain reference significance for the coal city in the growth period.展开更多
Systematically revealing the impact of cultivated land fragmentation(CLF)on the geographical agglomeration pattern of agricultural specialization(AS)has positive significance for national agricultural production manag...Systematically revealing the impact of cultivated land fragmentation(CLF)on the geographical agglomeration pattern of agricultural specialization(AS)has positive significance for national agricultural production management.Based on the data of the second national land survey and agricultural production,this study has explored the impact of CLF on spatial heterogeneity of agricultural agglomeration in China by comprehensively using the Theil index,ordinary least square model and geographically weighted regression.Results showed that:(1)the regional differentiation of the CLF in China is obvious,and the cultivated land fragmentation index is generally characterized by increasing pattern from northwest to southeast.(2)Spatially,the development level of AS in China has formed three high-value clusters in the Northeast China Plain,the Qinghai-Tibet Plateau,and the middle of the Middle-lower Yangtze Plain;and the low-value contiguous areas centered on the Yunnan-Guizhou Plateau and the Sichuan Basin and surrounding regions,with significant spatial differences.The contribution of grain crops,economic crops,and vegetables and melon to the level of AS was 74.63%,9.09%,and 16.28%,respectively,and the pattern of agricultural geographical aggregation dominated by grain crops has primarily taken in shape.(3)CLF is significantly negatively correlated with AS,and every 1%increase in the degree of CLF will result in a decrease of about 0.2%in AS.However,the impact of CLF on the geographic agglomeration of different crop categories or groups varies significantly.Among them,CLF has a prominent impact on the specialization level of grain crops and vegetables and melon.Each 1%increase in the CLF will reduce the specialization level of grain crops by 0.38%,and increase the level of vegetables and melon by about 0.22%.(4)According to the landscape characteristics of cultivated land,the degree of spatial division and agglomeration of cultivated land patches have a significant impact on the formation of geographical agglomerationpattern of AS,and the intensity and direction of influence show significant regional differentiation,while the patch size has no significant impact.展开更多
基金Sponsored by National Natural Science Foundation of China(51478389)
文摘Coal cities are the main part of the resource-based cities in China, and the benign development of coal cities' spatial structure has a direct impact on these cities' future economic and social development, as well as the urban residents' welfare. Land use fragmentation is the most typical morphological characteristic of the coal city's spatial structure development. In this paper, Pingdingshan City of Henan Province in China is taken as an example. Through empirical analysis, the urban spatial structure development processes of a typical coal resource-based city in its mature period are illustrated, and the formation reasons and potential mechanism behind coal city land use fragmentation are explored, and the measurement method of land use fragmentation degree of the coal city is put forward. On the above basis, the appropriate adjustment strategies and methods aimed at the coal city spatial structure are found out and given. This study is a good guideline and reference for the spatial structure planning and land use planning of the coal city during the mature and declining period, which is of great help to the sustainable development and industrial structure transformation of the coal city. It also has certain reference significance for the coal city in the growth period.
基金National Natural Science Foundation of China,No.41971234,No.41971235Project of Graduate Student Innovative and Practical Research in Jiangsu Province,No.KYCX20-0028Major Program of National Social Science Foundation of China,No.19ZDA096。
文摘Systematically revealing the impact of cultivated land fragmentation(CLF)on the geographical agglomeration pattern of agricultural specialization(AS)has positive significance for national agricultural production management.Based on the data of the second national land survey and agricultural production,this study has explored the impact of CLF on spatial heterogeneity of agricultural agglomeration in China by comprehensively using the Theil index,ordinary least square model and geographically weighted regression.Results showed that:(1)the regional differentiation of the CLF in China is obvious,and the cultivated land fragmentation index is generally characterized by increasing pattern from northwest to southeast.(2)Spatially,the development level of AS in China has formed three high-value clusters in the Northeast China Plain,the Qinghai-Tibet Plateau,and the middle of the Middle-lower Yangtze Plain;and the low-value contiguous areas centered on the Yunnan-Guizhou Plateau and the Sichuan Basin and surrounding regions,with significant spatial differences.The contribution of grain crops,economic crops,and vegetables and melon to the level of AS was 74.63%,9.09%,and 16.28%,respectively,and the pattern of agricultural geographical aggregation dominated by grain crops has primarily taken in shape.(3)CLF is significantly negatively correlated with AS,and every 1%increase in the degree of CLF will result in a decrease of about 0.2%in AS.However,the impact of CLF on the geographic agglomeration of different crop categories or groups varies significantly.Among them,CLF has a prominent impact on the specialization level of grain crops and vegetables and melon.Each 1%increase in the CLF will reduce the specialization level of grain crops by 0.38%,and increase the level of vegetables and melon by about 0.22%.(4)According to the landscape characteristics of cultivated land,the degree of spatial division and agglomeration of cultivated land patches have a significant impact on the formation of geographical agglomerationpattern of AS,and the intensity and direction of influence show significant regional differentiation,while the patch size has no significant impact.
