百花山典型林分土壤有机碳储量及垂直分布特征

Soil Organic Carbon Storage and Vertical Distribution of Different Forest Types in Baihua Mountain Area

针对百花山落叶阔叶混交林、华北落叶松林、桦木林3种典型林分土壤有机碳储量及垂直分布特征进行研究。结果表明,不同林分类型下的土壤有机碳含量存在明显差异,桦木林最高(33.87g/kg±2.82g/kg),华北落叶松林次之(27.42g/kg±2.21g/kg),落叶阔叶混交林最低(26.24g/kg±1.91g/kg),桦木林土壤有机碳的密度为(26.06±1.88)kg/m2,落叶阔叶混交林为(19.81±1.70)kg/m2,华北落叶松林为(18.94±1.50)kg/m2,土层间有机碳密度为(1.57～7.22)kg/m2,且随着土层深度的增加呈现减少的趋势;不同林分中0～20cm土层有机碳储量占整个剖面有机碳总储量的百分比均达到50%以上,0～20cm土层有机碳含量变化总趋势为下坡位>中坡位>上坡位。

Storage and vertical distribution features of soil organic carbon（SOC） about mixed deciduous broad-leaved forest,Larix principis-rupprechtii forest and Betula spp.forest in Baihua Mountain of Beijing were studied in this paper.The results were as follows： the contents of SOC in different types of forest showed significantly difference;SOC content presented a rule as Betula spp.forest Larix principis-rupprechtii forest mixed deciduous broad-leaved forest,the average value was（33.87±2.82） g/kg,（27.42±2.21） g/kg,and（26.24±1.91） g/kg correspondently;SOC density was Betula spp.forest（26.06±1.88 kg/m^2） mixed deciduous broad-leaved forest（19.81±1.70 kg/m^2） Larix principis-rupprechtii forest（18.94±1.50 kg/m^2）.SOC density changed with a range of 1.57-7.22 kg/m^2 for five soil layers in the three forest types,and both the density and content decreased with the depth of soil layers;on the upper layer（0-20 cm）,the SOC content followed the variety trend of lower slope 〉middle slope〉 upper slope,and this layer occupied more than 50% SOC in all the soil profiles（0-80 cm）.