Characteristics ofδ1 3 C in typical aquatic plants and carbon sequestration by plant photosynthesis in the Banzhai catchment,Maolan of Guizhou Province
LI Rui
YU Shi
SUN Ping-an
HE Shi-yi
YUAN Ya-qiong
XIONG Zhi-bin
Abstract：Aquatic plants play a key role in study of the carbon cycle by using inorganic carbon as a source for photosynthesis.The object of this work is to figure out the contribution of aquatic vegetations to carbon se-questration with the Banzhai catchment in Guizhou as study area.The biomass of typical aquatic plants both in summer and winter was measured.Meanwhile,theδ1 3 C of 4 kinds of aquatic plants,which grew at sam-pling sites,were tested.The results show that the biomass in summer is less than that in winter.Besides, the obtained values ofδ1 3 C for emergent aquatic plants range from -33.59 ‰ to -27.05 ‰,with an aver-age of -30.32 ‰,for floating plants from -35.45 ‰ to -24.62 ‰,with an average of -29.96 ‰,re-spectively,and for submerged plants it was measured a value of -27.89 ‰.The meanδ1 3 C values of various plants in descending order are emergent plants,floating plants,and submerged plants.Additional to this re-sults the double-meta model was used,by this model the percentage of HCO -3 uptake from water by aquat-ic photosynthesis can be estimated.The calculated HCO -3 carbon consumption by photosynthesis was 1 9.52 tC/(a·km2 ),HCO -3 used by aquatic plants for photosythesis accounted for almost 47.84 % of the total uesd inorganic carbon in Banzhai river,and this part of HCO -3 was converted into organic carbon and fixed in aquatic plants.The results indicate that the contribution of aquatic plants to carbon sequestration,especially to the net carbon sink estimation in karst regions cannot be neglected.
Keywords：aquatic plantscarbon sequestrationδ1 3 C valuedissolved inorganic carboncarbon sink
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 9-16 )