期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 66, 期 2, 页码 343-350出版社
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/F09-003
关键词
-
资金
- US Environmental Protection Agency's Science [RD83170801]
- Michigan Sea Grant College Program [R/NIS-4]
- Office of Sea Grant, National Oceanic and Atmospheric Administration (NOAA) [NA76RG0133]
- US Department of Commerce
- State of Michigan
- National Science Foundation [DEB-0423627, DBI-9602252]
Lakes in carbonate-rich watersheds commonly precipitate calcium carbonate as calcite, and this is accelerated by photosynthetic uptake of carbon dioxide, Co-precipitation of phosphate with calcite is one reason that algal growth in such lakes tends to be strongly phosphorus (P) limited. The extent to which calcite precipitation can be a sink for added P. and thus act as a potential negative feedback to eutrophication, was demonstrated using large enclosures within a Michigan lake. Nitrogen and P were added over 45 days in the summer to produce mesotrophic and eutrophic conditions. Algal biomass and production increased markedly with the nutrient additions, elevating the pH (9-10) and greatly increasing calcite precipitations, reducing concentrations of calcium and alkalinity by up to 60%. Sediment traps indicated that calcite sedimentation was a major sink for added P. By the end of the experiment, only about of the added P remained in the water column. Major ion concentrations in a larger set of Michign lakes showed calcite precipitation to be widespread, reflecting the abundant carbonate minerals in this glacial region.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据