Study On The Dynamics Of Energy Production Of Dominant Plants Community In Binjiang Wetland

In order to protect and restore wetland ecosystem, and improve the amount of production of the wetland. It is the current situation that the Binjiang wetland has been destroyed seriously, and the function of the wetland has been weakened, the sight has been demolished. The author studies on the dynamics of energy production of dominant plants community and its efficiency for solar energy utilization in Binjiang Wetland. The objective is to provide the theoretic and technical bases for the wetland human-induced restoration. The major results are as follows:(1) The dynamics of calorific value, existent energy value, biomass and annual net primary productivity in a dominant plant community at Binjiang wetland were studied and measured in the year 2006. The results showed that Phragmites australis and Phalaris arundinacea with all the caloric value of the reproductive organs period increased slightly, but the changes are more smoothly. Energy value of existing communities increase with time, and is consistent with the biomass growth tendency, which shows that the Phragmites australis could grow more rapidly, and have higher biomass, so the Phragmites australis could be one of the priority implemental plant.(2) In the view of the whole growth, The efficiency for solar energy utilization were calculated with growth phase of Phragmites australis (from March 1, 2006 to October 31, 2006) and Phalaris arundinacea (from March 1, 2006 to May 5, 2006) in Binjiang Wetland. The efficiency for solar energy utilization of Phragmites australis and Phalaris arundinacea were 1.30 % and 0.33 %, respectively. These suggest that the relationship between mechanism of productivity of dynamics and mechanism of energy dynamics stimulated in photosynthesis are very closer.(3) The radiation energy environment, photosynthesis and respiration rate, productivity, and and its energy production of dominant plant community were measured and further analyzed by survey of wetland vegetation ecosystem. The efficiency for solar energy utilization in Binjiang wetland was 1.87% in the view of the whole growth. Simplifying the process, it will form the collapsible model of energy flux process, The stability analysis showed that the stability mechanism of the equilibrium state was the negative feedback mechanism. It was found that the ecosystem is presently in a state of deviating from its balance of energy flux, which has a progressive stability. The energy flux through the ecosystem is being in a transition from a labile state to a stable state of balance. According to the situation and distribution of vegetation, the suggestion of wetland management is proposed. (4) Taking Phragmites australis harvesting in Binjiang wetland as example, compare the harvesting of manual work and mechanized in the cost-benefit situation, the results show it is necessary to implementation of the Phragmites australis mechanized harvest, and apply to the Binjiang wetlands Phragmites australis havesters by selection analysis, according to the problems in reed harvesting machinery, the suggestion of development strategy of Phragmites australis harvest mechanization in China is proposed.