Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1006/jare.1998.0391 |
Early warning indicators of desertification: examples of tests in the Chihuahuan Desert | |
de Soyza, AG; Whitford, WG; Herrick, JE; Van Zee, JW; Havstad, KM | |
通讯作者 | de Soyza, AG |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS |
ISSN | 0140-1963 |
出版年 | 1998 |
卷号 | 39期号:2页码:101-112 |
英文摘要 | Perennial grasslands that dominated the south-west United States during the past 10,000 years have been desertified to varying extents. Desertification is a temporal phenomenon, defined in this paper as a change in the scale of the spatial distribution of resources. We report here on several indicators of desertification, using bare patch indices as surrogates for direct measures. A bare patch index based on canopy cover, which is relevant for precipitation and wind-driven erosion, is not equivalent to another bare patch index based on soil surface measurements, which is relevant for overland water flow-driven erosion. Per cent grass cover, per cent long-lived grass cover, per cent cover of vegetative reproducers, and a relative preference index all yielded sensitive indicators of desertification. The usefulness of some indicators, such as organic litter, depends upon recent environmental history. Other indicators, such as per cent cover due to grazing-resistant species, appear not to be sensitive to desertification and need further development. Range site type may also be important in determining indicator responses, where some indicators were sensitive to a range site while others were not. Overall, we have identified several sensitive indicators of desertification based on vegetational characteristics in varied range sites in the northern Chihuahuan Desert. |
英文关键词 | bare patch index Chihuahuan Desert ecosystem health indicators litter |
类型 | Article ; Proceedings Paper |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000074789600002 |
WOS关键词 | RANGELAND ; EROSION ; WIND |
WOS类目 | Ecology ; Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | New Mexico State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/136021 |
作者单位 | (1)New Mexico State Univ, USDA ARS, Las Cruces, NM 88003 USA;(2)New Mexico State Univ, Jornada Expt Range, Las Cruces, NM 88003 USA;(3)US EPA, Natl Exposure Res Lab, Las Vegas, NV 89193 USA;(4)US EPA, Characterizat Res Div, Las Vegas, NV 89193 USA |
推荐引用方式 GB/T 7714 | de Soyza, AG,Whitford, WG,Herrick, JE,et al. Early warning indicators of desertification: examples of tests in the Chihuahuan Desert[J]. New Mexico State University,1998,39(2):101-112. |
APA | de Soyza, AG,Whitford, WG,Herrick, JE,Van Zee, JW,&Havstad, KM.(1998).Early warning indicators of desertification: examples of tests in the Chihuahuan Desert.JOURNAL OF ARID ENVIRONMENTS,39(2),101-112. |
MLA | de Soyza, AG,et al."Early warning indicators of desertification: examples of tests in the Chihuahuan Desert".JOURNAL OF ARID ENVIRONMENTS 39.2(1998):101-112. |
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