Soil precipitation legacies influence intraspecific plant–soil feedback

种内竞争 处女圆锥花序 生态学 植物群落 生物 生态系统 植物生态学 生物量(生态学) 降水 环境科学 农学 物种丰富度 地理 气象学 生物能源 可再生能源
作者
Kerri M. Crawford,Christine V. Hawkes
出处
期刊:Ecology [Wiley]
卷期号:101 (10) 被引量:36
标识
DOI:10.1002/ecy.3142
摘要

Abstract Feedbacks between plants and soil microbial communities can play an important role in structuring plant communities. However, little is known about how soil legacies caused by environmental disturbances such as drought and extreme precipitation events may affect plant–soil feedback or whether plant–soil feedback operates within species as it does between species. If soil legacies alter plant–soil feedback among genotypes within a plant species, then soil legacies may alter the diversity within plant populations. We conducted a fully factorial pairwise plant–soil feedback experiment to test how precipitation legacies influenced intraspecific plant–soil feedbacks among three genotypes of a dominant grass species, Panicum virgatum . Panicum virgatum experienced negative intraspecific plant–soil feedback, i.e., genotypes generally performed worse on soil from the same genotype than different genotypes. Soil precipitation legacies reversed the rank order of the strength of negative feedback among the genotypes. Feedback is often positively correlated with plant relative abundance. Therefore, our results suggest that soil precipitation legacies may alter the genotypic composition of P. virgatum populations, favoring genotypes that develop less negative feedback. Changes in intraspecific diversity will likely further affect community structure and ecosystem functioning, and may constrain the ability of populations to respond to future changes in climate.
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