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Recent progress and future directions of chinaFLUX

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Science china Earth Sciences 2006年第S2期49卷 1-23页

作者： YU Guirui , FU Yuling, SUN Xiaomin, WEN Xuefa & ZHANG Leiming Key laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, beijing 100101, china School of Earth Sciences, Graduate University of the Chinese Academy of Sciences, beijing 10004., china 1. Key laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China 2. School of Earth Sciences Graduate University of the Chinese Academy of Sciences Beijing 100049 China

The eddy covariance technique has emerged as an important tool to directly measure carbon dioxide, water vapor and heat fluxes between the terrestrial ecosystem and the atmosphere after a long history of fundamental research and technological developments. With the realization of regional networks of flux measurements in North American, European, Asia, Brazil, Australia and Africa, a global-scale network of micrometeorological flux measurement (FLUXNET) was established in 1998. FLUXNET has made great progresses in investigating the environmental mechanisms controlling carbon and water cycles, quantifying spatial-temporal patterns of carbon budget and seeking the "missing carbon sink" in global terrestrial ecosystems in the past ten years. The global-scale flux measurement also built a platform for international communication in the fields of resource, ecology and environment sciences. With the continuous development of flux research, FLUXNET will introduce and explore new techniques to extend the application fields of flux measurement and to answer questions in the fields of bio-geography, eco-hydrology, meteorology, climate change, remote {3. and modeling with eddy covariance flux data. As an important part of FLUXNET,{4.FLUX has made significant progresses in the past three years on the methodology and technique of eddy covariance flux measurement, on the responses of CO2 and H2O exchange between the terrestrial ecosystem and the atmosphere to environmental change, and on flux modeling development. Results showed that the major forests on the North-South Transect of Eastern{4. (NSTEC) were all carbon sinks during 2003.to 2005, and the alpine meadows on the Tibet Plateau were also small carbon sinks. However, the reserved natural grassland, Leymus chinensis steppe in Inner Mongolia, was a carbon source. On a regional scale, temperature and precipitation are the primary climatic factors that determined the carbon balance in major terrestrial ecosystems in

关键词： eddy covariance flux measurement carbon budget terrestrial ecosystem FLUXNET chinaFLUX.

Empirical-Statistical Models Based on remote sensing for Estimating the Volume of Landslides Induced by the Wenchuan Earthquake

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Journal of Mountain Science 2011年第5期8卷 711-717页

作者： FAN Jianrong LI Xiuzhen GUO Fenfen GUO Xiang Key laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Chengdu 610041 China Institute of Mountain Hazards and Environment CAS Chengdu 610041 China

The Wenchuan Ms 8.0 earthquake on May 12, 2008 induced a huge number of landslides. The distribution and volume of the landslides are very important for assessing risks and understanding the landslide - debris flow - barrier lake - bursts flood disaster chain. The number and the area of landslides in a wide region can be easily obtained by remote sensing technique, while the volume is relatively difficult to obtain because it requires some detailed geometric information of slope failure surface and sub-surface. Different empirical models for estimating landslide volume were discussed based on the data of 107 landslides in the earthquake-stricken area. The volume data of these landslides were collected by field survey. Their areas were obtained by interpreting remote sensing images while their apparent friction coefficients and height were extracted from the images unifying DEM ({4. elevation model). By analyzing the relationships between the volume and the area, apparent friction coefficients, and the height, two models were established, one for the adaptation of a magnitude scale landslide events in a wide range of region, another for the adaptation in a small scope. The correlation coefficients (R2) are 0.7977 and 0.8913. respectively. The results estimated by the two models agree well with the measurement data.

关键词： 5.12 Wenchuan earthquake Landslides remote sensing Volume Estimation model

Spatial distribution analysis of landslides triggered by 2008.5.12 Wenchuan Earthquake,china

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Spatial distribution analysis of landslides triggered by 200...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Shengwen Qi~(a,b,*),Qiang Xu~b,Hengxing Lan~c,Bing Zhang~d,Jianyou Liu~(a,1) a Key Lab.of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing,china,P.O.Box 9825,Chaoyang area,beijing,100029,china b State Key Lab.of Geo-hazard Prevention and Geo-{4. Protection,Chengdu University of Technology,Chengdu,610059,china c State Key laboratory of Resources and {4.al System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,beijing,100101,china d Centre for Earth Observation and digital Earth,Chinese Academy of Sciences,beijing,100190,china

The 2008.5.12 Wenchuan Earthquake(seismic magnitude M 7.9 according to the USGS)triggered a great number of landslides.A spatial database of landslides is built by interpreting the remote sensing(RS)data which covers 11 counties severely damaged by the earthquake with area of about 3.,686.12 *** geological settings of the study area are detailed mapped including geologic structure and *** digital elevation model(DEM)of the study area with resolution of 3. m×3. m is presented to address the topographic *** between the occurrence of landslides with geological settings i.e. active faults(the coseismic surface ruptures),geological unit,slope gradient,slope elevation as well as slope aspect are analyzed using spatial modeling in GIS with the aids of field *** can be concluded that the distance to the causative faults and slope gradient are much more important than other factors. Landslides are clustered distributed along the causative faults of F2 and F3.and landslides incidence are dramatically decreasing with the increasing of the distance to the causative *** landslides incidence has an obvious increase near the active faults *** concentration(LC,landslides/km)has an obvious exponent increase with slope ***,LC has no obvious relationship with geological unit and slope elevation;the difference of LC value in each geological unit(each slope elevation category)maybe have been the result affected by slope gradient for each geological unit(each slope elevation category)and distance of each geological unit(each slope elevation category)to causative fault *** map reflects the incidence of landslides in some degree,and LC increases dramatically with Intensity increasing, almost all landslides occurred in the region aboveⅥdegree. Statistics result also indicates that in the near field of causative faults,landslides tend to have the initial sliding direction similar to the movement

关键词： 2008.5.12 Wenchuan Earthquake Slope Landslide Spatial analysis

Precise U-series Dating of Coral Reefs from the South china Sea and the High Sea Level during the Holocene

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Precise U-series Dating of Coral Reefs from the South China ...

中国科学院地质与地球物理研究所2003.术年会

作者： Z.B.Ma+,J.L.Xiao+,X.T.Zhao+,Z.C.Peng++,M.Xia+, G.P.Zhang§,Z.R.Wang++,and Z.S.An+ +Institute of Geology and Geophysics Chinese Academy of Sciences beijing 100029,china ++Department of Earth and Space Sciences University of Science and Technology of china Hefei 23.026,china§Institute of remote sensing Application Chinese Academy of Sciences beijing 100101,china +Institute of Earth environment Chinese Academy of Sciences Xi’an 710054.china

Coral reefs formed along the southern coast of Hainan Island are one of the most developed Holocene fringing reefs in *** present new precise Th ages of coral reefs collected from the Shuiweiling section in the southern coast of the Hainan Island,Dengloujiao in the southwest of the Leizhou Peninsula,and the Chenhang Island and Jinyin Island of the Xisha(Paracel) Islands in the South china *** the high-precision U-series dates and stratigraphic evidence,the timing and character of the sea-level variations of the middle-Holocene in study region are examined: The results show that a flourishing period of coral reef flats in the South china Sea and along its northern coasts appeared in ca.6800 to 5800 a *** is 650 to 950 years earlier than the previous C dates(6150-4.50 a).The sea level relative to the nor thern coasts of South china Sea was 3.to 4.m or more higher than that of the present during this period.

关键词： South china Sea Holocene coral reefs TIMS dating sea-level changes

remote sensing analyses of spatio-temporal changes of the ecological environment in the lower reaches of the Tarim River

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Remote sensing analyses of spatio-temporal changes of the ec...

The First International Conference on Computers and Computing Technologies in Agriculture

作者： YAN ZHENGLONG~(1 2 *) HUANG QIANG~1 TIAN HUIFANG~3.JIN XIAOCHUN~4.1 College of Hydraulic and Electrical Engineering Xi’an University of Technology 5 South Jinhua Road Xi’an City 71004. PR china 2 Aerial Photogrammetry and remote sensing Bureau 3.Jianxi Road Xi’an City 710054.PR china 3.Baoji University of Arts and Sciences 4. Baoguang Road Baoji City 721007 PR china 4.Ordnance Engineering College 97 Heping Road Shijiazhuang City 050003.PR china

＜正＞The ecological environment in the Tarim River Basin is extremely *** ecological problems resulting from local economic development in this region have been a hot topic for the ecological *** is a new trend to use information technologies to monitor the ecological environment dynamically by means of the modern information *** meet the constant requirements of long-term monitoring of a region ecological environment,this paper focuses on the vegetation coverage and land desertification on the basis of the information technologies of {3. {4.（RS）,geographic positioning systems（GPS）, geographic information systems（GIS）,and data warehouse,applying the theory of the integrative spatial and attribute data,seamless integration of multi-source *** ecological environment for the lower reaches of the Tarim River is analysed qualitatively and *** investigated database is established and managed through multisource and multi-type massive data,which are collected from three periods of the {3. {4. images and background data in 1999,2002 and 2004. *** methods of system classification, {3. {4. interpretation,vegetation coverage, conversion models construction,and massive data built database are applied to analyse the data concerned during the dynamically monitoring the ecological environment in the Tarim River Basin. The results show that the vegetation coverage has increased gradually each year after the emergent water transportation project was started,whereas the desertification area has decreased,some sand areas have obviously *** speed of improvement in the east part of the fiver has been higher than in the *** ecological environment in the lower reaches of the Tarim River has tended to improve after the emergent water transportation project in the lower reaches of the Tarim River *** conclusion, the emergent water delivery plays a decisive and significant role in promoti

关键词： database ecological environment remote sensing Tarim River

Path Planning of Intelligent Information Acquisition Robot in Planted Forest

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Path Planning of Intelligent Information Acquisition Robot i...

2010 Second IITA International Conference on Geoscience and remote sensing (IITA-GRS 2010)

作者： Yan Fei Kan Jiang-ming and Zheng Yi-li School of Technology beijing Forestry University beijing china

Considering the path planning issue of an intelligent motion robot which will be used to acquire environment information and tree growing information in a planted forest,a kind of improved genetic algorithm based path optimization method is proposed. According to tree’s distribution style in a planted forest the robot’s working environment is modeled as many grids which are labeled either ordered couples or sequence numbers. Then how to initialize the population is introduced and the fitness function to optimize the motion path of an information acquiring robot in a planted forest is defined. Some genetic operators,such as selection operator,crossover operator and mutation operator,are designed and a kind of operator to detect redundant grids is put forward. The simulation under the VC++ Platform is carried out. The result indicates that the proposed algorithm is efficient way to plan a optimal path for the information acquiring motion robot in a planted forest.

关键词： mobile robot planted forest path planning genetic algorithm

Internet环境下海量地形数据发布和三维显示

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同济大学学报（自然科学版） 2004年第12期32卷 1671-1676页

作者：张立强童小华杨崇俊刘冬林中国科学院遥感应用研究所北京100101 同济大学测量与国土信息工程系上海200092

论述了在Internet环境下海量地形数据发布和三维显示的关键技术 ,包括平均插值小波建立金字塔数据结构的原理和方法、快速压缩解压缩技术、网络模型和基于视相关的二叉三角形简化地形的算法 .在此基础上 ,开发了基于Internet的全球三维... 详细信息

论述了在Internet环境下海量地形数据发布和三维显示的关键技术 ,包括平均插值小波建立金字塔数据结构的原理和方法、快速压缩解压缩技术、网络模型和基于视相关的二叉三角形简化地形的算法 .在此基础上 ,开发了基于Internet的全球三维可视化信息系统 .实验表明 ,所提出的技术方案是切实可行的 ,完全能够满足Internet环境下大规模数字高程模型和影像实时无缝漫游的要求 .

关键词：地形数据平均插值小波二叉三角形负载平衡分布式组件

A RESEARCH ON THE DYNAMIC MONITORING SYSTEM FOR FORAGE-LIVESTOCK BALANCE IN THE TEMPERATE CRASSLAND OF china

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干旱区资源与环境 1993年第Z1期7卷 275-278页

作者： Li Bo Shi Peijun Lin Xiaoquan Grassland Research Institute, Chinese Academy of Agricultural Sciences, Hohhot, china beijing Normal University, china GRI, Chinese Academy of Agricultural Sciences, Hohhot

Some principles and methods for the dynamic monitoring of forage-livestock bal-ance in the grazing system on the temperate grassland of china were discussed in thispaper. To prepare a dynamic monitoring system or the ... 详细信息

关键词： Temperate Grassland Forage-Livestock Balance remote sensing Estimaion for Production Grassland Dynamic Monitoring

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智能化土壤侵蚀遥感解译系统

水土保持学报 2002年第A1期16卷 54-57页

作者：杨胜天朱启疆李智广北京师范大学北京100875 水利部水土保持监测中心北京100053

从智能化土壤侵蚀遥感解译系统原理、系统总体结构、系统各模块结构和系统检验 4.方面阐述了智能化土壤侵蚀遥感解译系统的计算机实现过程和精度检验 ,认为通过遥感影像激发土壤侵蚀专家对区域土壤侵蚀因子及其土壤侵蚀信息的认识 ,并... 详细信息

从智能化土壤侵蚀遥感解译系统原理、系统总体结构、系统各模块结构和系统检验 4.方面阐述了智能化土壤侵蚀遥感解译系统的计算机实现过程和精度检验 ,认为通过遥感影像激发土壤侵蚀专家对区域土壤侵蚀因子及其土壤侵蚀信息的认识 ,并记录他们的知识数据 ,建立知识库 ,用于土壤侵蚀信息自动提取是一种新的科学。

关键词：专家系统土壤侵蚀遥感地理信息系统