Effects of plant productivity and species richness on the drought response of soil respiration in temperate grasslands

PloS One
Susanne BurriAnsgar Kahmen

Abstract

Soil respiration plays a crucial role in global carbon cycling. While the response of soil respiration to abiotic drivers like soil temperature and moisture is fairly well understood, less is known about the effects of biotic drivers, such as plant above- and belowground productivity or plant diversity, and their interactions with abiotic drivers on soil respiration. Thus, current predictions of soil respiration to summer droughts might miss relevant biological drivers and their interactions with abiotic drivers. Since drought events are expected to increase in Central Europe in the future, we simulated early summer drought using rainout shelters at 19 grassland sites, which differed in plant productivity and species richness in central Germany in 2002 and 2003. We tested the potentially interacting effects of drought with biotic drivers, i.e. annual above-ground productivity, species richness and root biomass, on the drought response of soil respiration in temperate grasslands. In both years, drought led to a significant reduction in soil respiration. The drought-induced reduction in soil respiration was largely driven by the reduction in above-ground productivity in response to drought. The extent of the drought response of s...Continue Reading

References

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Aug 1, 2014·Functional Plant Biology : FPB·Yann SalmonNina Buchmann

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Citations

Jan 10, 2021·Proceedings of the National Academy of Sciences of the United States of America·Philip A FayH Wayne Polley

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