Hafner, S*; Unteregelsbacher, S; Seeber, E; Xu, X; Li, X; Guggenberger, G; Miehe, G; Kuzyakov, Y: Effect of grazing on C stocks and assimilate partitioning in Tibetan montane pasture revealed by 13CO2 pulse labeling
Poster, 7th Sino-German Workshop on Tibetan Plateau Research, Hamburg: 2011-03-03 - 2011-03-06

Since the late 1950s governmental rangeland policies have changed the grazing management on the Tibetan Plateau (TP). Increasing grazing pressure and since the 1980s the privatization and fencing of pastures near villages lead to land degradation, whereas remote pastures recover from stronger overgrazing. To clarify the effect of changing grazing intensity on the carbon (C) cycle of the TP, we investigated differences in belowground C stocks, sources of CO2 efflux from soil and C allocation using in situ 13CO2 pulse labeling of 1) a montane Kobresia winter pasture, and 2) a 7-year old grazing exclosure plot, both on the TP in 3440 m a.s.l. The aims of this study were (1) to determine the partitioning of recently fixed C among pools in the plant-soil system, (2) to evaluate differences in the partitioning pattern of recently fixed C assimilates between the grazed and ungrazed grassland, (3) to estimate the effect of grazing on C input into soil, and (4) to evaluate differences in SOC stocks after seven years of grazing exclosure.

last modified 2011-04-15