Arid
DOI10.1658/1100-9233(2006)017[0029:SBSBAV]2.0.CO;2
Similarity between seed bank and vegetation in a semi-arid annual plant community: The role of productivity and grazing
Osem, Y; Perevolotsky, A; Kigel, J
通讯作者Osem, Y
来源期刊JOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
出版年2006
卷号17期号:1页码:29-36
英文摘要

Question: Large variation in the similarity between seed bank and standing vegetation generally occurs along environmental gradients. We asked: 1. How is seed bank-vegetation similarity in Mediterranean semi-arid annual plant communities related to variation in primary productivity; 2. How is this productivity-similarity relationship affected by exclusion from grazing.


Location: Mediterranean, semi-arid rangeland in the Northern Negev desert, Israel.


Methods: Density of seeds and plants, and species composition of the seed bank and vegetation were compared in grazed and ungrazed subplots, in four neighbouring topographic sites differing in productivity. Seed bank samples were collected in autumn, just before the rainy season, and vegetation samples in the following spring, at peak above-ground biomass, when net primary productivity was assessed.


Results: Quantitative and qualitative similarities between seed bank and the vegetation (Sorensen index values) varied between 0.14-0.61 and 0.40-0.68. Quantitative similarity and productivity were positively and linearly related within the low productivity range (up to 160 g.m(-2)), in both grazed and ungrazed subplots. In contrast, at higher productivity levels (up to 500 g.m(-2)), similarity decreased slightly with productivity in the ungrazed subplots, but no trend Occurred in the grazed subplots. At low productivity, grazing did not affect similarity, while at higher productivity grazing prevented the reduction in similarity with increasing productivity.


Conclusion: seed bank - vegetation similarity, with and without grazing, is positively related to productivity up to a threshold range, above which soil resource availability is no longer the factor limiting plant density. Above this range grazing prevents a reduction in similarity with increasing productivity, by diminishing vegetation cover and litter accumulation that constrain germination, seedling emergence and plant survival.


英文关键词grassland Mediterranean rangeland
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000235669200005
WOS关键词SALT-MARSH ; ABOVEGROUND VEGETATION ; DYNAMICS ; GRASSLAND ; GRADIENT ; RANGELAND ; ESTABLISHMENT ; ENVIRONMENTS ; REGENERATION ; GERMINATION
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
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/2XILL650/152404
作者单位(1)Hebrew Univ Jerusalem, Robert H Smith Inst Plant Sci & Genet Agr, Fac Agr Food & Environm Qual Sci, Rehovot, Israel;(2)ARO, Volcani Ctr, Dept Nat Resources, Bet Dagan, Israel
推荐引用方式
GB/T 7714
Osem, Y,Perevolotsky, A,Kigel, J. Similarity between seed bank and vegetation in a semi-arid annual plant community: The role of productivity and grazing[J]. Hebrew University of Jerusalem,2006,17(1):29-36.
APA Osem, Y,Perevolotsky, A,&Kigel, J.(2006).Similarity between seed bank and vegetation in a semi-arid annual plant community: The role of productivity and grazing.JOURNAL OF VEGETATION SCIENCE,17(1),29-36.
MLA Osem, Y,et al."Similarity between seed bank and vegetation in a semi-arid annual plant community: The role of productivity and grazing".JOURNAL OF VEGETATION SCIENCE 17.1(2006):29-36.
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