4.7 Article

Subordinate plant species moderate drought effects on earthworm communities in grasslands

期刊

SOIL BIOLOGY & BIOCHEMISTRY
卷 96, 期 -, 页码 119-127

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2016.01.020

关键词

Community recovery; Decomposers; Ecosystem functioning; Rainout shelter; Soil macrofauna; Subordinate species

资金

  1. Swiss National Science Foundation [31003A-114139]
  2. Swiss National Science Foundation (SNF) [31003A-114139] Funding Source: Swiss National Science Foundation (SNF)

向作者/读者索取更多资源

Loss of plant diversity resulting from forecasted drought events is likely to alter soil functioning and affect earthworm communities. Plant-soil interactions are expected to play an important role in mediating climate change effects on soil decomposers. In this study, we test above-belowground linkages after drought by focusing on the effects of subordinate plant species on earthworm communities. Using a combination of subordinate species removal and experimental drought, we show that subordinate species, when present, increased in biomass after drought and induced an increase in total earthworm biomass. These effects were thought to be associated with the maintenance of food quantity and quality (e.g. nitrogen-rich litter) in relation to subordinate species. In support to this hypothesis, we found a positive correlation between the abundance of juvenile earthworms and plant community biomass hence litter quantity, and between the total biomass of earthworms and the abundance of subordinate species. Anecic earthworms were the most benefited by the presence of subordinate species under drought, especially Lumbricus terrestris, which was significantly correlated to the biomass of the nitrogen-rich subordinate species Veronica chamaedrys. Results of a multiple factor analysis (MFA) also highlighted positive associations between earthworm and subordinate species, independently of the drought treatment. Our study highlights how climate change, in this case reduced summer rainfall, can influence plant functional groups, with cascading effects on earthworms. It is therefore crucial, considering forecasted climate change, to understand these processes in order to better predict ecosystem responses and to adapt grassland management. (C) 2016 Elsevier Ltd. All rights reserved.

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