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许宪平:“夏利系”黑马
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作者 姚一然 《中国经济和信息化》 2011年第18期19-19,共1页
如果没有在一汽夏利近四年的经历,许宪平也不会成为黑马。
关键词 许宪平 "夏利系" 轿车 汽业工业
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Spatial-temporal Pattern and Population Driving Force of Land Use Change in Liupan Mountains Region, Southern Ningxia, China 被引量:15
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作者 QUAN Bin M J M ROMKENS +4 位作者 TAO Jianjun LI Bicheng LI Chaokui YU Guanghui CHEN Qichun 《Chinese Geographical Science》 SCIE CSCD 2008年第4期323-330,共8页
The Liupan Mountains is located in the southern Ningxia Hui Autonomous Region of China, which forms an important dividing line between landforms and bio-geographic regions. The populated part of the Liupan Mountains r... The Liupan Mountains is located in the southern Ningxia Hui Autonomous Region of China, which forms an important dividing line between landforms and bio-geographic regions. The populated part of the Liupan Mountains region has suffered tremendous ecological damages over time due to population pressure, excessive demand and inappropriate use of agricultural land resources. In this paper, datasets of land use between 1990 and 2000 were obtained from Landsat TM imagery, and then spatial models were used to characterize landscape conditions. Also, the relationship between the population density and land use/cover change (LUCC) was analyzed. Results indicate that cropland, forestland, and urban areas have increased by 44,186ha, 9001ha and 1550ha, respectively while the grassland area has appreciably decreased by 54,025ha in the study period. The decrease in grassland was most notable. Of the grassland lost, 49.4% was converted into cropland. The largest annual land conversion rate in the study area was less than 2%. These changes are attributed to industrial and agricultural development and population growth. To improve the eco-economic conditions in the study region, population control, urbanization and development of an ecological friendly agriculture were suggested. 展开更多
关键词 land use/cover change (LUCC) GIS remote sensing Liupan Mountains region Loess Plateau
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