期刊
FUNCTIONAL ECOLOGY
卷 31, 期 8, 页码 1637-1646出版社
WILEY
DOI: 10.1111/1365-2435.12850
关键词
biodiversity; biomass harvest; clipping; community stability; hay; nitrogen addition; nitrogen addition frequency; productivity; steppe
类别
资金
- National Natural Science Foundation of China [31400390, 31430016, 41573063, 31370442, 31570469]
- National Key Research Project of China [2016YFC0500202]
- China Postdoctoral Science Foundation [2015T80153]
- TULIP Laboratory of Excellence [ANR-10-LABX-41]
- BIOSTASES - European Research Council under European Union's Horizon Research and Innovation Programme [666971]
1. Global reactive nitrogen (N) is projected to further increase in the coming years. Previous studies have demonstrated that N enrichment weakens the temporal stability of the ecosystem and the primary productivity through decreased biodiversity and species asynchrony. Mowing is a globally common practise in grasslands; and infrequent mowing can maintain or increase plant diversity under N enrichment conditions. However, it is unclear how infrequent mowing affects ecosystem stability in the face of N enrichment. 2. By independently manipulating the frequency (twice vs. monthly additions per year) and rate (i.e. 0, 1, 2, 3, 5, 10, 15, 20, and 50 g N m(-2) year(-1)) of NH4NO3 inputs and mowing (unmown vs. mown) over 3 years (2011-2013) in a temperate grassland of northern China, we aimed to examine the interactive effects of N enrichment and mowing on ecosystem stability. 3. The results show that mowing maintained a positive relationship between species richness and ecosystem stability despite N addition, but that it exacerbated the negative effects of N addition on ecosystem stability. Mowing increased mean primary productivity and plant species richness, but it also increased the synchrony of population fluctuations and the variability of primary productivity under N enrichment, thereby contributing to a decline in the ecosystem stability. 4. Thus, our study reveals that infrequent mowing can buffer the negative effects of N enrichment on biodiversity to some extent and further increase the primary productivity, but it exacerbates the loss of ecosystem stability with N enrichment, thereby threatening local and/or semiarid regional food security.
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