为了解生长季牦牛粪斑覆盖对高寒草甸生态系统温室气体排放的影响,于2012年6月25日-9月24日基于添加牛粪处理定位试验,利用静态箱-气相色谱法对高寒草甸生态系统N_2O、CH_4和CO_2通量进行测定。结果表明,粪斑覆盖对其生态系统N_2O、CH_4和CO_2排放具有刺激效应,其发生在粪斑覆盖的1―50 d,且3类温室气体峰值出现时间各异;粪斑覆盖导致的系统温室气体排放潜势较无牛粪覆盖增加了39.2%,其N_2O、CH_4和 CO_2的累积排放量分别为0.095、0.412、2 064 g CO_2·m~(-2),全球变暖潜势为2 102 g CO_2·m~(-2)。因此,高寒草地牦牛粪斑是重要的温室气体来源之一,在估测生态系统对气候变化的贡献中不可忽视。
英文摘要:
In order to understand the impacts of yak dung on greenhouse gas(GHG)emission in the alpine meadow of the Qinghai-Tibetan Plateau during the growing season,nitrous oxide(N_2O),methane(CH_4), and carbon oxide(CO_2)fluxes in Kobresia-dominanted meadow were measured by the static opaque chambergas chromatograph method.The results showed that the application of dung had distinct stimulating effects for N_2O,CH_4,and CO_2 fluxes,which occurred during the 1-50 days after application although the peak value presented at different time.The global warming potential induced by GHG emissions after dung application increased by 39.2%.The global warming potential and the cumulative flux of N_2O,CH_4, and CO_2 during three months research period after dung application was 2 102,0.095,0.412 and 2 064 g·m~(-2), respectively.Emission-time pattern of greenhouse gas should be paid more attention to assess global change to animalsexcrements as yak dung patches were strong GHG source.