华北落叶松人工林土壤CH_(4)和N_(2)O通量变化及其对土壤温度响应

Changes of Soil CH_(4) and N_(2)O Fluxes and Their Responses to Soil Temperature in Larix Principis-Rupprechtii Plantation

文章研究了大青山华北落叶松人工林土壤CH_(4)和N_(2)O通量变化特征。华北落叶松人工林5~9月土壤是大气CH_(4)汇(吸收)和大气N_(2)O源(排放)。CH_(4)通量范围为-132.11~-12.64μg·m^(-2)·h^(-1),平均值为-79.10μg·m^(-2)·h^(-1)。N_(2)O通量范围为1.59~22.83μg·m^(-2)·h^(-1),平均值为8.10μg·m^(-2)·h^(-1)。华北落叶松人工林5~9月土壤月均CH_(4)通量大小顺序为7月>5月>8月>9月>6月;土壤月均N_(2)O通量值大小顺序为8月>6月>5月>7月>9月。CH_(4)通量变化与土壤温度呈显著负相关(P<0.05);土壤CH_(4)通量Q_(10)范围为1.83~2.81。N_(2)O通量变化与土壤温度未表现出显著相关性,土壤N_(2)O通量Q_(10)范围为1.06~1.53。土壤CH_(4)通量对土壤温度的变化敏感性高于土壤N_(2)O通量。CH_(4)通量和N_(2)O通量的相关性未达显著水平。

The characteristics of CH_(4)and N_(2)O fluxes in soil of Larix principis-rupprechtii plantation in Daqing Mountain were studied in this paper.The soil of Larix principis-rupprechtii from May to September is the atmospheric CH_(4)sink(absorption)and atmospheric N_(2)O source(emission).The CH_(4)flux ranged from-132.11 to-12.64μg·m^(-2)·h^(-1),with an average of-79.10μg·m^(-2)·h^(-1).The N_(2)O flux ranged from 1.59 to 22.83μg·m^(-2)·h^(-1),with an average of 8.10μg·m^(-2)·h^(-1).The order of monthly average soil CH_(4)flux from May to September in L.principis-rupprechtii plantation was July>May>August>September>June.The order of monthly average soil N_(2)O flux was August>June>May>July>September.CH_(4)flux was significantly negatively correlated with soil temperature(P<0.05).The soil CH_(4)flux Q_(10)ranged from 1.83 to 2.81.There was no significant correlation between N_(2)O flux and soil temperature,and the range of soil N_(2)O flux Q_(10)was 1.06~1.53.The sensitivity of soil CH_(4)flux to soil temperature was higher than that of soil N_(2)O flux.The correlation between CH_(4)flux and N_(2)O flux was not significant.