中国科学院机构知识库网格系统: 检索

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	Stylized facts of past 1000-year of China's cropland changes 期刊论文 OAI收割 LAND USE POLICY, 2024, 卷号: 144, 页码: 107258 作者: Yang, Fan; Dong, Guanpeng; Wu, Pengfei; He, Fanneng \| 收藏 \| 浏览/下载：4/0 \| 提交时间：2024/08/22 Historical land -use change Cropland cover Population pressure Land policy China Past millennium
	Population density regulation may mitigate the imbalance between anthropogenic carbon emissions and vegetation carbon sequestration 期刊论文 OAI收割 SUSTAINABLE CITIES AND SOCIETY, 2023, 卷号: 92, 页码: 104502 作者: Liang, Dongzhe; Lu, Hongwei; Guan, Yanlong; Feng, Liyang; He, Li \| 收藏 \| 浏览/下载：27/0 \| 提交时间：2023/06/10 Population density Carbon footprint pressure Drivers China 's cities Sustainability
	Influences of population pressure change on vegetation greenness in China's mountainous areas 期刊论文 OAI收割 ECOLOGY AND EVOLUTION, 2017, 卷号: 7, 期号: 21, 页码: 9041-9053 作者: Li, Wei; Li, Xiubin; Tan, Minghong; Wang, Yahui \| 收藏 \| 浏览/下载：11/0 \| 提交时间：2019/09/25 Chinese mountainous areas land-use intensity migration Normalized Difference Vegetation Index population pressure regional variation vegetation greenness
	Influences of population pressure change on vegetation greenness in China's mountainous areas 期刊论文 OAI收割 ECOLOGY AND EVOLUTION, 2017, 卷号: 7, 期号: 21, 页码: 9041-9053 作者: Li, Wei; Li, Xiubin; Tan, Minghong; Wang, Yahui \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2019/09/25 Chinese mountainous areas land-use intensity migration Normalized Difference Vegetation Index population pressure regional variation vegetation greenness
	Relief degree of land surface and population distribution of mountainous areas in China 期刊论文 OAI收割 JOURNAL OF MOUNTAIN SCIENCE, 2015, 卷号: 12, 期号: 2, 页码: 518-532 作者: Liu Ying; Deng Wei; Song Xue-qian 收藏 \| 浏览/下载：33/0 \| 提交时间：2015/03/24 Land surface Relief degree Population density Population pressure Population distribution Mountain China
	Using models and spatial analysis to analyze spatio-temporal variations of food provision and food potential across China's agro-ecosystems SCI/SSCI论文 OAI收割 2015 作者: Wang Q.; Liu, X. H.; Yue, T. X.; Wang, C. L.; Wilson, J. P. 收藏 \| 浏览/下载：45/0 \| 提交时间：2015/12/09 Population pressure Food provision and potential Spatio-temporal modeling and analysis Agro-ecosystem human carrying-capacity land-use change grain production cultivated land climate-change security productivity challenge trends
	Land pressure and adaptation in the mountainous region of northern China: An empirical analysis of 21 small watersheds SCI/SSCI论文 OAI收割 2010 Zhu H. Y.; He S. J. 收藏 \| 浏览/下载：31/0 \| 提交时间：2012/06/08 land pressure adaptation environment restoration mountainous region northern China population pressure
	Land use dynamics and landscape change pattern in Hetao irrigation district, Inner Mongolia, China 会议论文 OAI收割 6th International Symposium on Digital Earth: Data Processing and Applications, Beijing, China, September 9, 2009 - September 12,2009 Zhang, Yinhui; Luo, Yi; Zhao, Wenwu 收藏 \| 浏览/下载：27/0 \| 提交时间：2014/12/07 This study analyzed spatial and temporal changes in land use in an irrigation district covering an area of 1.7 million ha in Northern China by GIS analyses and also investigated changes in landscape pattern using the landscape structure analysis program FRAGSTATS over the study period from 1986 to 2000. The decreases in farmland and the increases in grassland area mainly resulted from the policy of grain for green and converting slope farmland into pasture from China government. In spite of the efforts to conserve the fragile ecosystem the land degradation including soil salinization and grassland degradation was spreading rapidly. The area of alkali-saline land increased by 22493 ha and about 50555 ha of dense grassland degraded into mid-density grassland. In terms of landscape fragmentation both farmland and dense grassland showed the tendency of increased fragmentation. Both adverse natural conditions and human activities are responsible for the land degradation expansion in Hetao irrigation district but the root causes are increasing population pressure and irrational human activities such as flooding irrigation method and over-grazing. To prevent land degradation from spreading population control and improvement of the management are prerequisite approaches. 2010 SPIE.
	Ionicities of boron-boron bonds in B-12 icosahedra 期刊论文 OAI收割 Physical Review Letters, 2005, 卷号: 94, 期号: 1 J. L. He; E. D. Wu; H. T. Wang; R. P. Liu; Y. J. Tian 收藏 \| 浏览/下载：19/0 \| 提交时间：2012/04/14 structural-properties population analysis crystal-structures high-pressure suboxide b6o semiconductors carbide susceptibilities projection