open access

https://hdl.handle.net/2115/56485

The Structural Changes in Biological Productivity due to the Progress of Dairy in Lake Furen

日本語

堆積物

2011-08-31

日本海洋学会沿岸海洋研究会

沿岸海洋研究

49(1)

59-67

We investigated the quality of water of the inflow river in Lake Furen from May, 2006 through November, 2008. The mixed form of river water and the seawater in Lake Furen changed by ebb and flood tides and was weak mixed type of the estuary circulation at the time of the ebb tide and was strong mixed type at the time of the high tide. Highly concentrated nutrients from dairy farming drainage flowed into Lake Furen, and we examined the amount of nutrients used by phytoplankton in the estuary. We calculated the data from April, 2007 to March, 2008, which was 529 ton in DIN and 58 ton in DIP when we estimated load quantity in the year to Lake Furen by 3 main rivers, using the mean flow quantity as a minute for one year. Furthermore, this value became 2,533〜4,550 ton C when the amount of phytoplankton primary production using inputted nutrients was assumed to be 54-98% in DIN case, and approximately 100% in DIP case when we assumed only inputted nutrients from the river. In addition, the particles produced in the lake tended to not flow easily outside the lake. In addition, we estimated the silt content of, the sediment outer layer at various depths, and we revealed that the particles of the water column were selectively deposited as the silt became higher at inner part of the lake.

学術雑誌論文

Version of Record

1342-2758

AN10492259