Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jaridenv.2008.05.011 |
Mapping land degradation by comparison of vegetation production to spatially derived estimates of potential production | |
Wessels, K. J.1,2; Prince, S. D.2; Reshef, I.2 | |
通讯作者 | Wessels, K. J. |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS |
ISSN | 0140-1963 |
出版年 | 2008 |
卷号 | 72期号:10页码:1940-1949 |
英文摘要 | There is art urgent need for quantitative methods by which actual, as opposed to potential degradation can be mapped using spatially consistent criteria for large regions. This study tested the Local NPP Scaling (LNS) method, where the growth season sum NDVI (Sigma NDVI), a surrogate for productivity, of each pixel was expressed relative to the highest values (90th percentile) of Sigma NDVI observed in all pixels falling within the same land capability unit (LCU). The objective of this study was to determine if the LNS approach can be used to map degraded areas: (i) by determining if areas with low LNS values co-occur with degraded areas mapped with Landsat TM and (ii) testing the persistence of these areas over multiple years. Most of the areas with low LNS values did coincide with degraded areas, with the exception of four LCUs, which either contained steep precipitation gradients or landscape variability, which probably obscured the human impacts. The performance of the LNS method is therefore largely determined by the level of detail of the stratification data (e.g. LCUs) used. The conclusion is that the LNS method is a valuable tool for mapping land degradation at a regional scale. (c) 2008 Elsevier Ltd. All rights reserved. |
英文关键词 | AVHRR communal lands desertification Local NPP scaling rangelands South Africa |
类型 | Article |
语种 | 英语 |
国家 | South Africa ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000259001300018 |
WOS关键词 | HIGH-RESOLUTION RADIOMETER ; SOUTH-AFRICA ; AVHRR NDVI ; COVER CHANGES ; DESERTIFICATION ; INDEX ; TIME |
WOS类目 | Ecology ; Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/157991 |
作者单位 | 1.CSIR, Remote Sensing Res Unit, Meraka Inst, ZA-0001 Pretoria, South Africa; 2.Univ Maryland, Dept Geog, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Wessels, K. J.,Prince, S. D.,Reshef, I.. Mapping land degradation by comparison of vegetation production to spatially derived estimates of potential production[J],2008,72(10):1940-1949. |
APA | Wessels, K. J.,Prince, S. D.,&Reshef, I..(2008).Mapping land degradation by comparison of vegetation production to spatially derived estimates of potential production.JOURNAL OF ARID ENVIRONMENTS,72(10),1940-1949. |
MLA | Wessels, K. J.,et al."Mapping land degradation by comparison of vegetation production to spatially derived estimates of potential production".JOURNAL OF ARID ENVIRONMENTS 72.10(2008):1940-1949. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。