百花山典型林分土壤有机碳储量及垂直分布特征

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。

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

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/m2) > mixed deciduous broad-leaved forest(19.81±1.70 kg/m2) >Larix principis-rupprechtii forest(18.94±1.50 kg/m2).SOC density changed with a range of 1.57~7.22 kg/m2 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).