Title
Strong stoichiometric resilience after litter manipulation experiments; a case study in a Chinese grasslandStrong stoichiometric resilience after litter manipulation experiments; a case study in a Chinese grassland
Author
Faculty/Department
Faculty of Sciences. Biology
Faculty of Sciences. Chemistry
Research group
Plant and Vegetation Ecology (PLECO)
Organic synthesis
Publication type
article
Publication
Subject
Physics
Chemistry
Biology
Source (journal)
Biogeosciences
Volume/pages
12(2015):3, p. 757-767
ISSN
1726-4170
ISI
000349793100008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Global climate change has generally modified net primary production (NPP) which leads to increasing litter inputs in some ecosystems. Therefore, assessing the impacts of increasing litter inputs on soil nutrients, plant growth and ecological carbon (C) : nitrogen (N) : phosphorus (P) stoichiometry is critical for an understanding of C, N and P cycling and their feedback processes to climate change. In this study, we added plant above-ground litter, harvested near the experimental plots, to the 10-20 cm subsoil layer of a steppe community at rates equivalent to annual litter input of 0, 15, 30, 60 and 120 %, respectively, covering the entire range of the expected NPP increases in this region due to climate change (10-60 %). We measured the resulting C, N and P content of different pools (above-and below-ground plant biomass, litter, microbial biomass). Small litter additions, which are more plausible compared to the expected increase predicted by Earth system models, had no effect on the variables examined. Nevertheless, high litter addition (120% of the annual litter inputs) significantly increased soil inorganic N and available P, above-ground biomass, below-ground biomass and litter. Our results suggest that while very high litter addition can strongly affect C : N: P stoichiometry, the grassland studied here is resilient to more plausible inputs in terms of stoichiometric functioning.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/2bd812/51e90910.pdf
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