Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1117/12.466713 |
Vegetation evolution in and land of western China | |
Shi, QD; Lu, GH; Xiao, JD; Pan, XL; Zhang, J; Ji, L; Chang, SL | |
通讯作者 | Pan, XL |
会议名称 | International Conference on Ecosystems Dynamics, Ecosystem-Society Interactions, and Remote Sensing Applications for Semi-Arid and Arid Land |
会议日期 | OCT 24-27, 2002 |
会议地点 | HANGZHOU, PEOPLES R CHINA |
英文摘要 | NDVI (Normalized Difference Vegetation Index) values range from -1.0 to +1.0, -areas with NDVI < 0 rarely contain any vegetation, while NDVI >0.6, vegetation cover reaches 100%. The FVC (Fractional Vegetation Cover) values range from 0 to +1.0. Above this threshold the fractional vegetation cover increases approximately as the square of the NDVI, and reaches 100% at an upper NDVI threshold, which is considerably less than 1.0. In and and semi-arid regions, FVC is superior to NDVI. In this article we got the classification rules by using the resolution 1km FVC combining with DEM (Digital Elevation Model) to classify the vegetation types in and parts of western China. This classification system was used to classify all FVC images of the resolution 8km*8km from 1982a to 2000a, in this way, we got the classification maps of vegetation for every year. From these classification maps we calculated three majority maps from 1982-1989a, 1990-1995a and 1996-2000a. Supported by software ARC/INFO allowed us to identify whether cells were degraded or improved after comparing-every cell value at same location in three serial maps and then getting the evolution map of vegetation. The main results are as follows: 1) the vegetation in all of and west China has increased; 2) the vegetation was increased and the rate is higher than in all study area; cells showing improvement in mountainous areas are almost equal to cells showing degradation3) there were two types of improvement patches; the oasis patch increases around old oases and the plain sparse desert patch has also increased; 4) degradation patches appear more frequently in the lower reaches of the Tarim River, in all reaches of Cherchen River, the Jungger basin and to the south of Alxa Right County of Inner Mongolia; 5) in mountainous areas, most of the improvement cells took place in the south of the Tianshan mountains and Pamir high plain, degradation cells are located on the slope of the north Kunlun mountains as a long narrow region and big patch assembled in the Aljin Mountains and the north slope of the Qilian Mountains. |
英文关键词 | fractional vegetation cover vegetation evolvement vegetation classification remote sensing arid land in western China evolution of vegetation |
来源出版物 | ECOSYSTEMS DYNAMICS, ECOSYSTEM-SOCIETY INTERACTIONS, AND REMOTE SENSING APPLICATIONS FOR SEMI-ARID AND ARID LAND, PTS 1 AND 2 |
ISSN | 0277-786X |
出版年 | 2003 |
卷号 | 4890 |
页码 | 541-547 |
ISBN | 0-8194-4676-9 |
出版者 | SPIE-INT SOC OPTICAL ENGINEERING |
类型 | Proceedings Paper |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | CPCI-S |
WOS记录号 | WOS:000184693700062 |
WOS类目 | Ecology ; Environmental Sciences ; Remote Sensing |
WOS研究方向 | Environmental Sciences & Ecology ; Remote Sensing |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/294262 |
作者单位 | (1)Nanjing Inst Meteorol, Dept Atmospher Sci, Nanjing, Peoples R China |
推荐引用方式 GB/T 7714 | Shi, QD,Lu, GH,Xiao, JD,et al. Vegetation evolution in and land of western China[C]:SPIE-INT SOC OPTICAL ENGINEERING,2003:541-547. |
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