Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1006/jare.2002.1103 |
High-resolution images reveal rate and pattern of shrub encroachment over six decades in New Mexico, USA | |
Goslee, SC; Havstad, KM; Peters, DPC; Rango, A; Schlesinger, WH | |
通讯作者 | Goslee, SC |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS |
ISSN | 0140-1963 |
出版年 | 2003 |
卷号 | 54期号:4页码:755-767 |
英文摘要 | Encroachment of the shrub Prosopis glandulosa Torn (honey mesquite) into semi-arid grasslands is a serious concern in the south-western United States, yet little is known about the long-term dynamics of the invasion process. We used ten high-resolution aerial and satellite images taken from 1936 to 1996 to track the population dynamics and spatial pattern of all P glandulosa greater than 2 in in diameter on a 75 ha area in southern New Mexico. Shrub cover and patch numbers increased froth 1936 to the 1970s, then stabilized at 43% cover and 83 patches ha(-1). Individual patches were extremely persistent: 95% of the area occupied by shrub patches in 1936 was still occupied in 1996. Recruitment into the 2 in size class was more variable: 0.6-5.2% year(-1) (mean 0-8% year(-1)). Patch-shape complexity increased from 1936 to 1983 as adjacent shrubs merged, and then declined as those clusters filled in and became rounder. Spatial pattern of shrubs showed a distinct trend over time: strongly clustered in 1936 at lag distances up to 250 m, then random arrangement at all scales, and by 1983 pattern was regular at lag distances greater than 100 m. There was no clear relationship with precipitation. The use of remote sensing imagery allowed us to examine one site over time, and revealed patterns in population dynamics and spatial pattern that would not have been visible otherwise. Comparison of field estimates collected in 2001 with 1996 image data suggest that the canopy cover estimates were accurate, but shrub densities were seriously underestimated in the satellite photographs, which do not show shrubs smaller than 2 m diameter. As long as limitations of the imagery are understood, these methods can be applied over a larger and more heterogeneous area to examine environmental correlates of invasion success. (C) 2003 Elsevier Science Ltd. |
英文关键词 | Chihuahuan desert grassland Rrosopis glandulosa remote sensing shrub encroachment |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000183577100009 |
WOS关键词 | SOUTHERN NEW-MEXICO ; CHIHUAHUAN DESERT ; VEGETATION CHANGE ; GRASSLAND ; SAVANNA ; PHOTOGRAPHS ; POPULATIONS ; COMPETITION ; RECRUITMENT ; PERENNIALS |
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/2XILL650/144993 |
作者单位 | (1)USDA ARS, Fornada Experimental Range, Las Cruces, NM USA;(2)Duke Univ, Nicholas Sch Environm & Earth Sci, Durham, NC USA |
推荐引用方式 GB/T 7714 | Goslee, SC,Havstad, KM,Peters, DPC,et al. High-resolution images reveal rate and pattern of shrub encroachment over six decades in New Mexico, USA[J],2003,54(4):755-767. |
APA | Goslee, SC,Havstad, KM,Peters, DPC,Rango, A,&Schlesinger, WH.(2003).High-resolution images reveal rate and pattern of shrub encroachment over six decades in New Mexico, USA.JOURNAL OF ARID ENVIRONMENTS,54(4),755-767. |
MLA | Goslee, SC,et al."High-resolution images reveal rate and pattern of shrub encroachment over six decades in New Mexico, USA".JOURNAL OF ARID ENVIRONMENTS 54.4(2003):755-767. |
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