期刊
ECOLOGY AND EVOLUTION
卷 10, 期 16, 页码 8793-8800出版社
WILEY
DOI: 10.1002/ece3.6576
关键词
atmospheric nitrogen deposition; germination rate; plant diversity; plant functional group
资金
- National Natural Science Foundation of China [NSFC31600380]
- Key Scientific Research Projects of Higher Education Institutions [18A170010]
- Outstanding Youth Training Foundation of Henan University [yqpy201, 70055]
Seed germination plays an important role in mediating plant species composition of grassland communities under nitrogen (N) enrichment. Shifts of plant community structure with N-enhanced deposition in terrestrial ecosystems have occurred globally. Despite numerous studies about the effects of enhanced N deposition on mature plant communities, few studies have focused on seed germination. Using a laboratory experiment, we report the effects of five N concentrations, including 0, 5, 10, 20, and 40 mM N (NH4NO3) on seed germination of eight semi-arid grassland species. Results showed that low N concentrations (5- and 20-mM N) promoted mean final germination proportion of all eight species by 4.4% and 6.4%, but high concentrations (40 mM N) had no effect. The mean germination rate was decreased 2.1% and 5.1% by higher N concentration (20- and 40-mM N) levels, but germination start time showed the opposite trend, delayed by 0.7, 0.9, and 1.8 d for the 10, 20, and 40 mM N treatments. Final germination proportion, mean germination rate, and germination start time were significantly different among species in response to N concentration treatments. The final germination proportion ofAllium tenuissimumandChenopodium glaucumwere suppressed by increased N concentration, whereas it increased forPotentilla bifurca, Plantago asiatica,andSetaria viridis. Our findings provide novel insights into N deposition-induced species loss based on seed germination factors in semi-arid grassland communities.
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