期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 51, 期 14, 页码 7785-7793出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b06296
关键词
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资金
- Institute para el Control y la Conservacion de la Cuenca del Lago Maracaibo (ICLAM)
- New Zealand lake studies
- MJM
- Chinese scientific hosts
- USA NSF [1240851]
- Nancy Lee and Perry R. Bass Regent Chair in Marine Science
- Chinese Academy of Sciences [KZCXI-SW-12]
- Chinese Ministry of Science and Technology [2014zx07101-011]
- NSF of China [40371104]
- Direct For Biological Sciences
- Division Of Environmental Biology [1240870] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [1240851] Funding Source: National Science Foundation
Cyanobacterial harmful algal blooms (Cyano-HABs) ate enhanced by anthropogenic pressures, including excessive nutrient (nitrogen, N, and.hosphoms, P) inputs and a warming climate. Severe eutrophication in aquatic systems is often manifested as non-N-2-fixing CyanoHABs (e.g., Microcystis spp.), but the biogeochemical relationship between N inputs/dynamics and CyanoHABs needs definition. Community biological ammonium (NH4+) demand (CBAD) relates N dynamics to total microbial productivity and NH4+ deprivation in aquatic systems. A mechanistic conceptual model was constructed by combining nutrient cycling and CBAD observations from a spectrum of lakes to assess N cycling interactions with CyanoHABs. Model predictions were supported with CBAD data from a Microcystis bloom in Maumee Bay, Lake Erie, during summer 2015. Nitrogen compounds are transformed to reduced, more bioavailable forms (e.g., NH4+ and urea) favored by CyanoHABs. During blooms, algal biomass increases faster than internal NH4+ regeneration rates, causing high CBAD values. High turnover rates from cell death and remineralization of labile organic matter consume oxygen and enhance denitrification. These processes drive eutrophic systems to NH4+ limitation or colimitation under warm, shallow conditions and support the need for dual nutrient (N and P) control.
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