Yuanbo Geng
Chinese Academy of Science, China
Title: The application of 13C pulse labeling in the partitioning of soil respiration in a Leymus chinensis steppe in Inner Mongolia, China
Biography
Biography: Yuanbo Geng
Abstract
In this study, we researched the soil respiration distinction with 13C pulse labeling technique combining static chamber-Keeling plot method in the Leymus chinensis grassland in Xinlin River basin, Inner-Mongolia. During the observation period, the δ13C value of soil respiration averaged (-17.8±0.8) ‰, which was at the range of -20.7‰~-15.7‰; δ13C of microbial respiration averaged (-21.3±0.5) ‰, ranging from-22.5‰~-19.0‰. Roots do not reflect newly assimilated C since they have long residence time. The contribution of root respiration to soil respiration averaged (30±6) %, ranging from 7%~69%. The fraction of root respiration to soil respiration began to increase from the middle of July and reached its peak value until the middle of August. Then, it gradually decreased.