Estimating Net Primary Productivity and Nutrient Stock in Plant in Freshwater Marsh,Northeastern China |
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| Authors: | Junbao Yu Jingshuang Liu Franz X Meixner Jinda Wang Yongjun Gao Yang Wang Xiaoning Qi Xiaobing Chen |
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| Institution: | 1. Laboratory of Coastal Wetland Ecology, Key Laboratory of Coastal Zone Environmental Processes, CAS, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, P.R. China;2. Key Laboratory of Wetland Ecology and Environment, Department of Regional Agriculture, Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun, P.R. China;3. Biogeochemistry Department, Max‐Planck Institute for Chemistry, Mainz, Germany;4. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA |
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| Abstract: | We have investigated the contributions of three dominant macrophyte species, Deyeuxia angustifolia, Carex lasiocarpa, and Carex pseudocuraica (covering about 10 304 km2), to carbon (C), nitrogen (N), and phosphorus (P) stocks in the largest freshwater marsh (17 300 km2) in China for a 3‐year period (from 2002 to 2004). The monthly biomass, seasonal, and annual net primary productivity (NPP), and nutrient concentrations of three species were measured. All three plant species showed rapid growth in the rainy season. The maximum and minimum production rates in the freshwater marsh were ～36.19 and ～9.92 g m?2 day?1, respectively. The total NPP accounts 1900–2700 g m?2 year?1 in the studied area. Total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) concentrations in roots were higher than those in stem and leaf tissues. The vast beds of the three studied species comprise 80% of the grass covered marsh of Sanjiang plain, contributing annual nutrient stocks of ～10.99 × 106, ～788.36 × 103, and ～18.10 × 103 t (tonnes) for TOC, TN, and TP, respectively. Our results suggest that the nutrient bioaccumulation capacity in freshwater marshes depend mainly on plant species, which are decided by hydrological conditions. The nutrient stocks in the Sanjiang plain marsh have been greatly reduced because some of the area occupied by C. lasiocarpa was replaced by D. angustifolia as a result of succession caused by the changes of water table. |
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| Keywords: | Biomass Freshwater marsh NPP Nutrient stock |
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