Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Acta Pratacultural Science》 2001-02
Add to Favorite Get Latest Update

The establishment of grassland productive assessment model and the determination of precipitation resource distribution pattern of Gannan tibetan autonomous prefecture based on RS and GIS

WANG Xi zhi, DU Guo zhen, LIANG Tian gang, DAI Ruo lan, WANG Gang (State Key Laboratory of Arid Agroecology, Lanzhou University, Lanzhou, 730000, China)  
This paper discusses the methods of grassland ecology based on RS and GIS technologies. Meanwhile, by applying the technologies and the theory of plant ecology to establish grassland productive assessment model and precipitation resource distribution pattern of the Gannan tibetan autonomous prefecture. The framework of grassland GIS databases is put forward. The establishing process of GIS databases are illustrated by NDVI (normailized vegetation index ) and precipitation database. By using RS and GIS technologies and statistical methods, the NDVI of Gannan prefecture is extracted and a regression model is built up by sampling data in the study area. It is proved that positive correlation exists between the NDVI and the primary biomass. According to the data of 61 hydrologic and meterologic stations, the Gannan precipitation isogram is made. Four kind of methods (SPLINE, IDW, TREND and KRIGING ) are used to analyze the precipitation data and we find that the SPLINE is a better method for Gannan tibetan autonomous prefecture.
【Fund】: 国家自然科学基金重大项目!(NO .3989336 0 );; 甘肃省“九五”攻关项目!(GK9712 35A)
【CateGory Index】: Q948
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved