Land use in mountain grasslands alters drought response and recovery of carbon allocation and plant-microbial interactions

The Journal of Ecology
Stefan KarlowskyGerd Gleixner

Abstract

Mountain grasslands have recently been exposed to substantial changes in land use and climate and in the near future will likely face an increased frequency of extreme droughts. To date, how the drought responses of carbon (C) allocation, a key process in the C cycle, are affected by land-use changes in mountain grassland is not known.We performed an experimental summer drought on an abandoned grassland and a traditionally managed hay meadow and traced the fate of recent assimilates through the plant-soil continuum. We applied two 13 CO 2 pulses, at peak drought and in the recovery phase shortly after rewetting.Drought decreased total C uptake in both grassland types and led to a loss of above-ground carbohydrate storage pools. The below-ground C allocation to root sucrose was enhanced by drought, especially in the meadow, which also held larger root carbohydrate storage pools.The microbial community of the abandoned grassland comprised more saprotrophic fungal and Gram(+) bacterial markers compared to the meadow. Drought increased the newly introduced AM and saprotrophic (A+S) fungi:bacteria ratio in both grassland types. At peak drought, the 13C transfer into AM and saprotrophic fungi, and Gram(-) bacteria was more strongly r...Continue Reading

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Citations

Oct 2, 2019·The New Phytologist·Alex Williams, Franciska T de Vries
Jan 28, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Richard D Bardgett, Tancredi Caruso
Mar 7, 2021·Global Change Biology·Kevin Van SundertSara Vicca
Jun 6, 2021·Trends in Ecology & Evolution·Francesco de BelloJan Lepš

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