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浏览/检索结果: 共10条，第1-10条 帮助

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Ecological restoration and rising CO2 enhance the carbon sink, counteracting climate change in northeastern China 期刊论文  OAI收割
ENVIRONMENTAL RESEARCH LETTERS, 2022, 卷号: 17, 期号: 1, 页码: 14002
作者:  Huang, Binbin;  Lu, Fei;  Wang, Xiaoke;  Wu, Xing;  Zhang, Lu
  |  收藏  |  浏览/下载：17/0  |  提交时间：2022/11/07
Grassland gross carbon dioxide uptake based on an improved model tree ensemble approach considering human interventions: global estimation and covariation with climate 期刊论文  OAI收割
GLOBAL CHANGE BIOLOGY, 2017, 卷号: 23, 期号: 7, 页码: 2720-2742
作者:  Wang, Shuai;  Liang, Wei;  Lu, Yihe;  Zhang, Weibin;  Li, Shuai
  |  收藏  |  浏览/下载：37/0  |  提交时间：2018/07/20
Seasonal variations in the effect of microzooplankton grazing on phytoplankton in the East China Sea 期刊论文  OAI收割
CONTINENTAL SHELF RESEARCH, 2015, 卷号: 111, 期号: 2015, 页码: 304-315
作者:  Zheng, Liping;  Chen, Bingzhang;  Liu, Xin;  Huang, Bangqin;  Liu, Hongbin
收藏  |  浏览/下载：208/0  |  提交时间：2016/02/05
Seasonal variations in the effect of microzooplankton grazing on phytoplankton in the East China Sea 期刊论文  OAI收割
CONTINENTAL SHELF RESEARCH, 2015, 期号: 111, 页码: 304-315
作者:  Song, Shuqun;  Liu, Xin;  Huang, Bangqin;  Liu, Hongbin;  Zheng, Liping
  |  收藏  |  浏览/下载：26/0  |  提交时间：2016/02/05
Top-down control of spring surface phytoplankton blooms by microzooplankton in the Central Yellow Sea, China 期刊论文  OAI收割
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2013, 卷号: 97, 页码: 51-60
作者:  Sun, Jun;  Feng, Yuanyuan;  Zhou, Feng;  Song, Shuqun;  Jiang, Yan
收藏  |  浏览/下载：110/0  |  提交时间：2014/07/17
Fabrication of high-efficiency ultraviolet blazed gratings by use of direct Ar2-CHF3 ion-beam etching through a rectangular photoresist mask (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
Tan X.
收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25
In ultraviolet spectroscopy  groove irregularity and surface roughness of nanometer magnitude can cause a significant loss of diffraction efficiency. Therefore  there is a constant need to improve the diffraction efficiency. A blazed grating can concentrate most of the light intensity into a desired diffraction order  it is important to control the groove shape precisely  so it is the optimum choice among gratings of different kinds of profile. As the operating wavelength of most UV spectral applications is less than 200 nm  especially the blaze angle and the apical angle. We have presented a direct shaping method to fabricate EUV blazed gratings by using an ion-beam mixture of Ar+ and CHF2 +to etch K9 glass with a rectangular photoresist mask. With this method  the required blaze angle is small  we have succeeded in fabricating well-shaped UV blazed gratings with a 1200 line/mm groove density and 8.54 blaze angles and 1200 line/mm groove density and 11.68 blaze angles  and the metrical efficiency is about 81% and 78%. The good performance of the gratings was verified by diffraction efficiency measurements. When one uses the etching model  the conditions on the ion-beam grazing incident angle and the CHF3partial pressure should be noted. Besides  since the etched groove shape depends on the aspect ratio of the photoresist mask ridge  if we wish to fabricate larger gratings with this method  we must improve the uniformity of the photoresist mask before ion-beam etching. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
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.  
Population dynamics and responses to management of plateau pikas Ochotona curzoniae 期刊论文  OAI收割
journal of applied ecology, 2007, 卷号: 44, 期号: 3, 页码: 615-624
作者:  Pech, Roger P.;  Jiebu;  Arthur, Anthony D.;  Zhang Yanming;  Hui, Lin
收藏  |  浏览/下载：14/0  |  提交时间：2009/12/07
Vegetation restoration by seasonal exclosure in the Kerqin Sandy Land, Inner Mongolia 期刊论文  OAI收割
PLANT ECOLOGY, 1998, 卷号: 139, 期号: 2, 页码: 133-144
作者:  Katoh, K;  Takeuchi, KI;  Jiang, DM;  Nan, YH;  Kou, ZW
  |  收藏  |  浏览/下载：17/0  |  提交时间：2011/09/23
Vegetation restoration by seasonal exclosure in the Kerqin Sandy Land, Inner Mongolia 期刊论文  OAI收割
PLANT ECOLOGY, 1998, 卷号: 139, 期号: 2, 页码: 133-144
Katoh, K; Takeuchi, KI; Jiang, DM; Nan, YH; Kou, ZW
收藏  |  浏览/下载：24/0  |  提交时间：2011/09/23