期刊
CONTINENTAL SHELF RESEARCH
卷 31, 期 19, 页码 1967-1990出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2011.09.007
关键词
Great Barrier Reef; Nitrogen; Phosphorus; Budget; Denitrification; Nutrient cycling
类别
资金
- Australian Institute of Marine Science (AIMS)
- Cooperative Research Centre for the Great Barrier Reef World Heritage Area
Seasonally averaged N and P box model budgets were constructed for two regional-scale sections of the Great Barrier Reef (GBR) shelf, one in the near-pristine far-northern GBR (13.5-14.5 degrees S) and the other in the central GBR (17-18 degrees S) adjacent to more intensively farmed wet tropics watersheds. We were unable to simultaneously balance shelf-scale N and P budgets within seasonal or annual time frames, indicating that magnitudes of a number of key input and, especially, loss processes are still poorly constrained. In most cases, current estimates of system-level N and P sources (rainfall, runoff, upwelling, N-fixation) are less than estimated loss processes (denitrification, cross-shelfbreak mixing and burial). Nutrient dynamics in both shelf sections are dominated by the tightly coupled uptake and mineralization of soluble N and P in the water column and the sedimentation-resuspension of particulate detritus. On an area-averaged basis, internal cycling fluxes are an order of magnitude greater than input-output fluxes. Denitrification in shelf sediments is a significant sink for N while lateral mixing is both a source and sink for P. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
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