Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1442-9993.2010.02159.x |
Abiotic effects predominate under prolonged livestock-induced disturbance | |
Eldridge, David J.1; Val, James2; James, Alex I.1 | |
通讯作者 | Eldridge, David J. |
来源期刊 | AUSTRAL ECOLOGY
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ISSN | 1442-9985 |
出版年 | 2011 |
卷号 | 36期号:4页码:367-377 |
英文摘要 | Despite the widespread recognition that disturbance by livestock affects multiple indices of landscape health, few studies have examined their effects on both biotic and abiotic processes. We examined the effects of livestock disturbance on soil, vascular plants and reptiles across a disturbance gradient in a semi-arid Australian woodland. Our gradient ranged from long-ungrazed water remote sites, through intermediately grazed recovering sites, to currently grazed sites close to water. Our aim was to examine the nature of the effects of grazing-induced disturbance on biotic and abiotic processes along the gradient. We detected small biotic effects, but no abiotic effects, at low levels of disturbance (intermediate sites). We could not detect a consistent biotic effect on plants or reptiles along the gradient, except between the extreme disturbances. In contrast, we recorded substantial reductions in abiotic structure and function at the most disturbed sites. Structural changes included reductions in the cover of shrub hummocks and increases in bare soil, and reductions in cryptogamic soil crusts. Structural changes were associated with declines in function (soil stability and nutrient indices). Our data are consistent with the notion that abiotic effects predominate at high levels of disturbance in rangelands. Given the extent of abiotic modification at currently grazed sites, the cover of abiotic elements such as hummocks and soil surfaces would seem a better indicator of the long-term effect of grazing-induced disturbance than biotic components. The extent of disturbance at currently grazed sites across large areas of rangeland suggests that autogenic recovery will be protracted. |
英文关键词 | disturbance grazing gradient landscape function overgrazing plant diversity reptiles |
类型 | Article |
语种 | 英语 |
国家 | Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000291055400002 |
WOS关键词 | SPIDER ARANEAE ASSEMBLAGES ; BIOLOGICAL SOIL CRUSTS ; SEMIARID WOODLANDS ; MICROPHYTIC CRUSTS ; CHIHUAHUAN DESERT ; SHRUB PATCHES ; NEGEV DESERT ; AUSTRALIA ; VEGETATION ; GRASSLAND |
WOS类目 | Ecology |
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/2XILL650/167296 |
作者单位 | 1.Univ New S Wales, Ecol & Evolut Res Ctr, Sch Biol Earth & Environm Sci, Dept Environm Climate Change & Water, Sydney, NSW 2052, Australia; 2.Dept Environm Climate Change & Water, Buronga, NSW, Australia |
推荐引用方式 GB/T 7714 | Eldridge, David J.,Val, James,James, Alex I.. Abiotic effects predominate under prolonged livestock-induced disturbance[J],2011,36(4):367-377. |
APA | Eldridge, David J.,Val, James,&James, Alex I..(2011).Abiotic effects predominate under prolonged livestock-induced disturbance.AUSTRAL ECOLOGY,36(4),367-377. |
MLA | Eldridge, David J.,et al."Abiotic effects predominate under prolonged livestock-induced disturbance".AUSTRAL ECOLOGY 36.4(2011):367-377. |
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