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Leaf area index retrieval based on canopy reflectance and vegetation index in eastern China 被引量:5
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作者 JIANGJianjun CHENSuozhong +3 位作者 CAOShunxian WUHongan ZHANGLi ZHANGHailong 《Journal of Geographical Sciences》 SCIE CSCD 2005年第2期247-254,共8页
The aim of this paper is to investigate the feasibility of using Landsat TM data to retrieve leaf area index (LAI). To get a LAI retrieval model based ground reflectance and vegetation index, detailed field data were ... The aim of this paper is to investigate the feasibility of using Landsat TM data to retrieve leaf area index (LAI). To get a LAI retrieval model based ground reflectance and vegetation index, detailed field data were collected in the study area of eastern China, dominated by bamboo, tea plant and greengage. Plant canopy reflectance of Landsat TM wavelength bands has been inversed using software of 6S. LAI is an important ecological parameter. In this paper, atmospheric corrected Landsat TM imagery was utilized to calculate different vegetation indices (VI), such as simple ratio vegetation index (SR), shortwave infrared modified simple ratio (MSR), and normalized difference vegetation index (NDVI). Data of 53 samples of LAI were measured by LAI-2000 (LI-COR) in the study area. LAI was modeled based on different reflectances of bands and different vegetation indices from Landsat TM and LAI samples data. There are certainly correlations between LAI and the reflectance of TM3, TM4, TM5 and TM7. The best model through analyzing the results is LAI = 1.2097*MSR + 0.4741 using the method of regression analysis. The result shows that the correlation coefficient R2 is 0.5157, and average accuracy is 85.75%. However, whether the model of this paper is suitable for application in subtropics needs to be verified in the future. 展开更多
关键词 Landsat TM Leaf Area Index (LAI) vegetation indices retrieval model Taihu Lake
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Soybean Production & Trade in China——Implicated Impacts of GMO Regulation on Soybean Market 被引量:1
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作者 ShiRong ZhangTao YanXiaoqing 《Ecological Economy》 2005年第1期77-86,共10页
This paper provides an overview of the economic analysis,policy debate,and methodological issues on soybean production, import and export, and impacts of GMO regulation on soybean foreign trade of China. The paper ana... This paper provides an overview of the economic analysis,policy debate,and methodological issues on soybean production, import and export, and impacts of GMO regulation on soybean foreign trade of China. The paper analyzes China’s soybean production capability and discovers that the present yield of China’s soybean plant system cannot satisfy the domestic demand.The paperalso provides the method to solve such matters by using the result of a modified Cobb-Douglas model. In the third section of this paper, the impacts of GMO regulation on soybean trade and marketin China are analyzed.In this section,we provide a methodological issue to analyze the impacts of such regulation on trade.The paper then explains the implicated result induced by such regulations. 展开更多
关键词 Soybean production and trade GMO regulation IMPACTS
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Review of Present Collection and Research on Forestry Contracts of Qing Dynasty in Jinping County,Guizhou Province
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作者 ShenWenjia WangNingwei DongYuan 《Forestry Studies in China》 CAS 2004年第4期58-61,共4页
Forestry contracts of the Qing Dynasty in Jinping County, southwest China’s Guizhou Province, are a unique historical legacy of China. It came into being with the development of society and economy of Jinping. Resear... Forestry contracts of the Qing Dynasty in Jinping County, southwest China’s Guizhou Province, are a unique historical legacy of China. It came into being with the development of society and economy of Jinping. Research on these contracts is becoming widespread domestically and abroad as well. This paper is intended to make a review of the collection and research of forestry contracts in Jinping according to the chronological sequence. 展开更多
关键词 forestry contracts Jinping COLLECTION RESEARCH
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