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GASEOUS CARBON EMISSION (CO2, CH4) IN FIELD-BASED INCUBATION EXPERIMENT WITH -BURIED- ORGANIC MATTER, LENA DELTA, SIBERIA
Abstract
We aimed at identifying the microbial response and associated release of CO2 and CH4 in/from thawing soil that has been permanently frozen. For that we performed an in situ field-based incubation experiment in a rim of ice-wedge polygon on Samoylov island, Lena Delta, Russia (72пїЅ22пїЅN, 126пїЅ28пїЅE). Frozen "buried' organic matter were taken from eroded Lena river bank and transferred to the soil surface in a rim of ice-wedge polygon. The principle includes that formerly frozen soil is moved to the active layer, but still residing in the subsoil in order to mimic cryoturbation processes. The mean seasonal methane efflux from soil surface with the transplaced permafrost soil, as measured in the vegetation period after experiment set up, was 0.55пїЅ0.07 mg CH4 m-2 h-1; whereas the mean seasonal methane efflux from plots without buried organic material (i.e., disturbance control) was 0.50пїЅ0.02 mg CH4 m-2 h-1. Hence, differences were minor. CO2 emission measured by dark chambers did not differ in magnitude during 4 weeks from the beginning of the vegetation period, and then was approximately 1.5 times larger in plots containing organic material. The release of CO2 from soil was mainly responding to soil temperature, as the Pearson's coefficient for correlation between heterotrophic respiration rate and soil and air temperature was r=0.63, r=0.38, respectively. We conclude that the heterotrophic part of microbial community needs some period for adaptation to the chemical properties of the introduced organic matter (approximately 3-4 weeks). Consequently, due to the short vegetation period in this ecosystem we expect that the acceleration of carbon release is possibly not pronounced.
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