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Positive interactions among alpine plants increase with stress.

Abstract：

:Plants can have positive effects on each other. For example, the accumulation of nutrients, provision of shade, amelioration of disturbance, or protection from herbivores by some species can enhance the performance of neighbouring species. Thus the notion that the distributions and abundances of plant species are independent of other species may be inadequate as a theoretical underpinning for understanding species coexistence and diversity. But there have been no large-scale experiments designed to examine the generality of positive interactions in plant communities and their importance relative to competition. Here we show that the biomass, growth and reproduction of alpine plant species are higher when other plants are nearby. In an experiment conducted in subalpine and alpine plant communities with 115 species in 11 different mountain ranges, we find that competition generally, but not exclusively, dominates interactions at lower elevations where conditions are less physically stressful. In contrast, at high elevations where abiotic stress is high the interactions among plants are predominantly positive. Furthermore, across all high and low sites positive interactions are more important at sites with low temperatures in the early summer, but competition prevails at warmer sites.

journal_name

Nature

journal_title

Nature

authors

Callaway RM,Brooker RW,Choler P,Kikvidze Z,Lortie CJ,Michalet R,Paolini L,Pugnaire FI,Newingham B,Aschehoug ET,Armas C,Kikodze D,Cook BJ

doi

10.1038/nature00812

keywords:

subject

Has Abstract

pub_date

2002-06-20 00:00:00

pages

844-8

issue

6891

eissn

0028-0836

issn

1476-4687

pii

nature00812

journal_volume

417

pub_type

杂志文章

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