Abstract：In this paper we combined the laboratory simulation tests with field experiments of greenhouse gas fluxes, and analyzed the effects of different soil layers, grazing and fencing, long-term and short-term freezing-thawing, different frequency and intensity of freezing-thawing on soil N2O production rate and emission flux in Hulunbuir meadow grassland in Inner Mongolia. During freezing and thawing, the N2O productions mainly came from topsoil of 0to 9cm depth, and gradually reduced from the surface down to depth of 15cm soil. The N2O emissions decreased with lowing temperature differences. Under the situation of the same temperature differences, the N2O emissions decreased with increasing freezing-thawing frequencies. During the freezing-thawing cycle, N2O fluxes of fenced plot were greater than that of grazing plot, contributing to 25.09% of annual N2O emissions, while the contribution is about 12.38% for grazing plot. However from the annual time scale, the grazing increased the annual total N2O emissions. Early spring thawing was the largest contributors to the N2O emission during the whole period of freezing-thawing cycles.
秦赛赛, 翟秋敏, 杜睿, 梁宗敏, 杜鹏瑞, 路则栋, 李梓铭. 冻融对内蒙古温带贝加尔针茅草甸草原N2O通量的影响[J]. 中国环境科学, 2014, 34(9): 2334-2341.
QIN Sai-Sai, DI Qiu-Min, DU Rui, LIANG Zong-Min, DU Peng-Rui, LU Ze-Dong, LI Zi-Ming. Effect of freezing-thawing cycles on N2O fluxes from temperate Stipa baicalensis meadow grassland soils in Inner Mongolia. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2334-2341.
