期刊
ECOSYSTEMS
卷 13, 期 5, 页码 683-695出版社
SPRINGER
DOI: 10.1007/s10021-010-9347-0
关键词
arbuscular mycorrhizal fungi; phospholipid fatty acid; nitrogen; mycelium; microbial community; sugar maple (Acer saccharum); forest; in-growth bags
类别
资金
- NSF [0614422, 0735116]
- Ecosystem Science Center from Michigan Technological University
- Direct For Biological Sciences
- Division Of Environmental Biology [0735116] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0614422] Funding Source: National Science Foundation
Increased nitrogen (N) deposition caused by human activities has altered ecosystem functioning and biodiversity. To understand the effects of altered N availability, we measured the abundance of arbuscular mycorrhizal fungi (AMF) and the microbial community in northern hardwood forests exposed to long-term (12 years) simulated N deposition (30 kg N ha(-1) y(-1)) using phospholipid fatty acid (PLFA) analysis and hyphal in-growth bags. Intra- and extraradical AMF biomass and total microbial biomass were significantly decreased by simulated N deposition by 36, 41, and 24%, respectively. Both methods of extraradical AMF biomass estimation (soil PLFA 16:1 omega 5c and hyphal in-growth bags) showed comparable treatment responses, and extraradical biomass represented the majority of total (intra-plus extraradical) AMF biomass. N deposition also significantly affected the microbial community structure, leading to a 10% decrease in fungal to bacterial biomass ratios. Our observed decline in AMF and total microbial biomass together with changes in microbial community structure could have substantial impacts on the nutrient and carbon cycling within northern hardwood forest ecosystems.
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