Preliminary Research In Carbon Sequestration And Photosynthetic Physioecological And Ecological Characteristics Of Boehmeria Nivea

Ramie of perennial crop, a growing, but a continuous harvest 20 30 years; Ramie fastgrowth, every year may harvest season 3-4; Total dry matter the annual output reached 17.9t/ha, is the ideal biological fixing carbon and crops. This papers to the field of cultivation ofplant material from environment ramie physiological and ecological perspectivephotosynthetic characteristics and the physiological ecological factor on its photosynthesis,and explore the influence of the photosynthetic laws and ramie to its solid carbon preliminaryexploration ability.The response of photosynthetic rate to photosynthetic effective radiation and CO2, diurnalchange of photosynthetic rate and eco-physiology factors, were analyzed in situ by TPS^-2Portable Photosynthesis Analysis System under natural conditions, correlation analysis andstepwise regression equation were used to discuss how related factors influenced diurnalchanges of photosynthetic rate. The results showed: （1） the diurnal variation of Pnvaried in adouble-peaks curve, the height of the two photosynthetic peaks was similar. There wasobvious midday depression of photosynthesis. The daily course of net Trwas single peakedand the same trend with diurnal variation of Gs. （2）The critical points of light compensationand saturation of B.nivea were 54.18μmol·m^-2·s^-1and 1568.5μmol·m^-2·s^-1respectively; itsapparent quantum efficiency was 0.0258mol·mol^-1. Its CO2compensation point and saturationpoint were 49.25μmol·mol^-1and 1746.9μmol·mol^-1respectively; its carboxylation efficiencywas 0.045. （3）The main limiting factor affecting the characteristic of Pnof B.nivea was Ci, Gswas the main physiologi-cal factor.（4）The largest assimilation P= （215.71±0.56）mmol ofunit leaf area of B.nivea, the largest carbon sequestration capacity=（8.55±0.003）g·m^-2·d^-1of unit leaf area of B.nivea, higher than the solid-carbonenergy plant of Hippophae rhamnoides.