Root exudates from drought-affected plants increase soil respiration across a range of grassland species

IF 9.8 1区 农林科学 Q1 SOIL SCIENCE
Fangbin Hou, Leonardo Hinojosa, Eileen Enderle, Boris Jansen, Elly Morriën, Franciska T. de Vries
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引用次数: 0

Abstract

Root exudates play an important role in ecosystem carbon (C) cycling. Drought can alter the quality and quantity of root exudation, but it is not clear how root traits affect these changes, and what the implications are for soil C cycling. Seventeen common grassland species of three functional groups were subjected to a two-week drought followed by one week of recovery, after which root exudates were collected and analysed for their total C content, as well as for the respiration they triggered. Across all species but especially in legumes, drought increased specific root exudate-induced respiration rates. Both specific root exudation rate and specific respiration rate were positively correlated to root diameter and root nitrogen content, implying a link with “outsourcing” and “fast” strategies, and this correlation was strengthened after drought. These findings suggest that increased specific respiration rates as a result of drought-induced changes in root exudation is a plant strategy for coping with drought that may result in a loss of soil C after a drought has ended. These findings may help understand the impacts of drought on the capacity of soils to store C, and offer insight into the role of plants in this process.
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来源期刊
Soil Biology & Biochemistry
Soil Biology & Biochemistry 农林科学-土壤科学
CiteScore
16.90
自引率
9.30%
发文量
312
审稿时长
49 days
期刊介绍: Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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