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春季解冻期北方森林土壤释放出大量的N2O,是大气温室气体的主要来源之一.本研究将分布于塔河(52°31′N)、松岭(50°43′N)、孙吴(49°13′N)和带岭(47°05′N)4个纬度上林分状况相似的兴安落叶松林样地(包括幼树、地被物和A、B层土壤)移置至其自然分布区南缘,模拟气候暖化,分析春季解冻期土壤N2O通量的时间动态及其影响因子.结果表明:各处理的土壤N2O释放高峰均出现在解冻中后期.带岭、孙吴、松岭和塔河样地土壤解冻期的土壤N2O平均通量分别为(66.5±9.3)、(54.3±5.6)、(44.3±5.3)和(33.5±3.7)μg.m-2.h-1;土壤N2O通量与5cm土壤温度和0～10cm土壤微生物生物量碳呈显著正相关,但与土壤含水率的相关性不显著.解冻期4个处理的土壤N2O释放差异显著,其平均通量和累积释放量均随纬度升高而下降.这种差异主要是由于不同纬度土壤的微生物活性和土壤物理性质的差异引起的.
This study will be distributed in Tahe (52 ° 31’N), Songling (50 ° 43’N), Sun Wu ( (Including saplings, ground cover and A and B soil layers) with similar stand status at 4 latitudes (49 ° 13’N) and belt ridge (47 ° 05’N) to their natural The results showed that the N2O release peak appeared in the middle and late stages of thawing in each treatment period.Ziling, Sun Wu, Pinus massoniana The mean N2O fluxes of soils during Thawing and Tahe river thawing were (66.5 ± 9.3), (54.3 ± 5.6), (44.3 ± 5.3) and (33.5 ± 3.7) μg.m-2.h- There was a significant positive correlation between soil N2O flux and soil temperature at 5 cm and soil microbial biomass carbon at 0 ~ 10 cm, but no significant correlation with soil moisture. Soil N2O release was significantly different among the four treatments during thawing period. Cumulative release decreased with increasing latitude, which was mainly attributed to differences in microbial activity and soil physical properties at different latitudes.