Arid
DOI10.1046/j.1365-2745.2002.00730.x
Grazing effect on diversity of annual plant communities in a semi-arid rangeland: interactions with small-scale spatial and temporal variation in primary productivity
Osem, Y; Perevolotsky, A; Kigel, J
通讯作者Osem, Y
来源期刊JOURNAL OF ECOLOGY
ISSN0022-0477
出版年2002
卷号90期号:6页码:936-946
英文摘要

1 The interactive effect of grazing and small-scale variation in primary productivity on the diversity of an annual plant community was studied in a semiarid Mediterranean rangeland in Israel over 4 years. The response of the community to protection from sheep grazing by fenced exclosures was compared in four neighbouring topographic sites (south- and north-facing slopes, hilltop and wadi (dry stream) shoulders), differing in vegetation, physical characteristics and soil resources. The herbaceous annual vegetation was highly diverse, including 128 species. Average small-scale species richness of annuals ranged between 5 and 16 species within a 20 x 20 cm quadrat, and was strongly affected by year and site.


2 Above-ground potential productivity at peak season (i.e. in fenced subplots) was typical of semiarid ecosystems (10-200 g m(-2)), except on wadi shoulders (up to 700 g m(-2)), where it reached the range of subhumid grassland ecosystems. Grazing increased richness in the high productivity site (i.e. wadi), but did not affect, or reduced, it in the low productivity sites (south- and north-facing slopes, hilltop). Under grazing, species richness was positively and linearly related to potential productivity along the whole range of productivity. Without grazing, this relationship was observed only at low productivity (< 200 g m(-2)).


3 The effect of grazing along the productivity gradient on different components of richness was analysed. At low productivity, number of abundant, common and rare species all tended to increase with productivity, both with and without grazing. Rare species increased three times compared with common and abundant species. At high productivity, only rare species continued to increase with productivity under grazing, while in the absence of grazing species number in the different abundance groups was not related to productivity.


4 In this semiarid Mediterranean rangeland, diversity of the annual plant community is determined by the interaction between grazing and small-scale spatial and temporal variation in primary productivity, operating mainly on the less abundant species in the community.


英文关键词competition disturbance Mediterranean sheep species richness
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000179548000002
WOS关键词SPECIES RICHNESS ; MEDITERRANEAN GRASSLANDS ; SEED DISPERSAL ; PATTERNS ; BIOMASS ; COMPETITION ; DESERT ; ENVIRONMENTS ; VEGETATION ; PROTECTION
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
来源机构Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/143069
作者单位(1)Hebrew Univ Jerusalem, Inst Plant Sci & Genet Agr, Fac Agr Food & Environm Qual Sci, IL-76100 Rehovot, Israel;(2)Agr Res Org, Volcani Ctr, Dept Nat Resources, IL-50250 Bet Dagan, Israel
推荐引用方式
GB/T 7714
Osem, Y,Perevolotsky, A,Kigel, J. Grazing effect on diversity of annual plant communities in a semi-arid rangeland: interactions with small-scale spatial and temporal variation in primary productivity[J]. Hebrew University of Jerusalem,2002,90(6):936-946.
APA Osem, Y,Perevolotsky, A,&Kigel, J.(2002).Grazing effect on diversity of annual plant communities in a semi-arid rangeland: interactions with small-scale spatial and temporal variation in primary productivity.JOURNAL OF ECOLOGY,90(6),936-946.
MLA Osem, Y,et al."Grazing effect on diversity of annual plant communities in a semi-arid rangeland: interactions with small-scale spatial and temporal variation in primary productivity".JOURNAL OF ECOLOGY 90.6(2002):936-946.
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