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D-1.3.1 Development of Ecological Model for Element Cycle in East China Sea

[Contact Person]

Masataka Watanabe
Director
Division of Water and Soil Environment
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305-0053, Japan
Tel: +81-298-50-2338 Fax: +81-298-50-2576
E-mail: masawata@nies.go.jp

Total Budget for FY1996-FY1998

26,240,000 Yen (FY 1998; 3,723,000 Yen)

Abstract

Based on marine mesocosm experiment conducted from Oct. 10 to Oct. 17, 1997, in Changjiang Estuary, ecosystem model was developed. It was found that photosynthetic pathways was composed of diatom (Skeletonema, Chaetoceros) and copepod (Paracalanus, Oithona, Microsetella), and that bacterial pathway was composed of bacteria, picoplankton and Appendicularia (Oikopleura). Ecosystem model expressing phytoplankton succession of diatom and dinoflagellate, grazing by zooplankton, nutrient dynamics, microbial loop including bacterial and photosynthetic pathways was included for Changjiang estuary. The model was described by vertically one dimensional mass conservation equation with 15 independent variables including N, P, Si in dissolved matter and particulate biota of phytoplankton, picoplankton, bacteria and zooplankton. The model was validated by measured data of marine mesocosm experiment in Changjiang estuary.

[Key Words]

Ecosystem model, element cycle, Changjiang estuary, bacterial pathway, photosynthetic patyway