Scopus记录号: 2-s2.0-85056992122
论文题名: Mechanisms of seed mass variation along resource gradients
作者: DeMalach N. ; Ron R. ; Kadmon R.
刊名: Ecology Letters
ISSN: 1461023X
出版年: 2019
卷: 22, 期: 1 起始页码: 181
结束页码: 189
语种: 英语
英文关键词: Annual plants
; community-weighted mean
; community-weighted variance
; competition-colonisation trade-off
; functional diversity
; functional traits
; grassland
; productivity
; seed size
; soil depth
英文摘要: The enormous variation in seed mass along gradients of soil resources has fascinated plant ecologists for decades. However, so far, this research has focused on the description of such variation, rather than its underlying mechanisms. Here we experimentally test a recent model relating such variation to two fundamental properties of plant growth: allometry of biomass growth and size-asymmetry of light competition. According to the model, mean seed mass should increase, and the variance of seed mass should show a unimodal response, to increasing soil resource availability (productivity). We test these predictions and their underlying assumptions using a combination of field observations, mesocosm experiments and greenhouse experiments focusing on Mediterranean annual plants. Our results support the predictions and assumptions of the model, and allow us to reject alternative models of seed mass variation. We conclude that growth-allometry and size-asymmetric light competition are key drivers of seed-mass variation along soil resource gradients. © 2018 John Wiley & Sons Ltd/CNRS 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122765
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Biology, Stanford University, Stanford, CA 94305, United States; Department of Ecology, Evolution and Behavior, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel
Recommended Citation:
DeMalach N.,Ron R.,Kadmon R.. Mechanisms of seed mass variation along resource gradients[J]. Ecology Letters,2019-01-01,22(1)