A MODEL TO SIMULATE NET PRIMARY PRODUCTION OF DEYEUXIA ANGUSTIFOLIA IN WETLANDS IN SANJIANG PLAIN, CHINA
三江平原湿地小叶章生产力模拟模型

Background and Aims Carbon sequestration in ecosystems is determined largely by primary production of ecosystems. The application of long-term observation of vegetation biomass limits ecological and global change research. Therefore,it is necessary to apply simulation models to estimate an ecosystem's input of organic carbon and forecast the impact of climate change. Methods Based on the principles of plant physiology,a simulation model was developed to simulate primary production of Deyeuxia angustifolia in wetland ecosystems. It is driven by conventional parameters observed from meteorological stations. This model consists of three main function modules: photosynthesis-respiration,accumulation of assimilated matter and distribution of assimilated matter. The effects of temperature,waterlogging and increased concentration of atmosphere CO-2 on the growth of D. angustifolia were taken into account in this model. The model was validated by comparing observed and simulated data of aboveground living and litter biomass of D. angustifolia. Key Results The dynamics of aboveground living biomass,total litter,stem litter and leaf litter of D. angustifolia were simulated correctly. The liner correlation between simulated and observed values was highly significant. Conclusions Validation results from an adjacent area and a field experiment station also showed that the simulated values were significantly correlated with observed values in seasonally and permanently waterlogged D. angustifolia ecosystems. Daily changes of primary production,biomass and liter of D. angustifolia in wetland ecosystems could be effectively simulated by this model.