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科研机构
清华大学 [1]
遥感与数字地球研究所 [1]
武汉大学 [1]
成都理工大学 [1]
内容类型
会议论文 [4]
发表日期
2013 [2]
2010 [2]
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The Research on Using Ordinary Portland Cement to Prepare Anti-corrosive Concrete Under Frigid Saline-alkaline Geological Condition
会议论文
作者:
Fan, Shengli
;
Ouyang, Ming
;
Xiao, Hua
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浏览/下载:7/0
  |  
提交时间:2019/12/05
saline-alkali soil
ordinary Portland cement
frost resisting and anti-corrosive concrete with strong endurance
Experimental study on soil amelioration of Salinealkali land: A case study of saline-alkali soil ameliorated by coal ash and coal gangue
会议论文
Nanjing, China, July 26, 2013 - July 28, 2013
作者:
Zhao, Xu
;
Peng, Peihao
;
Xu, Wei
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  |  
浏览/下载:1/0
  |  
提交时间:2019/12/09
Study an improvement of concrete durability by using high performance cement
会议论文
ENVIRONMENTAL ECOLOGY AND TECHNOLOGY OF CONCRETE, International Symposium on Environmental Ecology and Technology of Concrete (EETC 2005), Urumqi, PEOPLES R CHINA, Web of Science
Feng, NQ
;
Niu, QL
;
Cai, JW
;
Li, CZ
;
Huang, RC
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浏览/下载:4/0
Land use dynamics and landscape change pattern in Hetao irrigation district, Inner Mongolia, China
会议论文
6th International Symposium on Digital Earth: Data Processing and Applications, Beijing, China, September 9, 2009 - September 12,2009
Zhang, Yinhui
;
Luo, Yi
;
Zhao, Wenwu
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浏览/下载:16/0
  |  
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.
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