CAJ | 학술논문

以桂北地区桉树(Eucalyptus grandis×E. urophylla)林、杉木(Cunninghamia lanceolata)林、马尾松(Pinus massoniana)林和毛竹(Phyllostachys edulis)林的土层0~60 cm土壤为研究对象，对比分析了4种森林类型的土壤有机碳质量分数及密度分布特征。结果表明：（1）在4种森林类型土层中，有机碳质量分数的最大值[(49.49±1.16) g·kg-1]和最小值[(4.50±0.52) g·kg-1]分别出现在毛竹林土层0~15 cm和马尾松林土层45~60 cm。土层0~60 cm有机碳质量分数平均值按大小顺序排列为：毛竹林(28.16 g·kg-1)>杉木林(25.10 g·kg-1)>桉树林(14.52 g·kg-1)>马尾松林(9.56 g·kg-1)。桉树林、杉木林、马尾松林和毛竹林土层0~15 cm有机碳质量分数所占的比例分别为28.29%、39.14%、55.44%和43.94%。（2）4种森林类型土层中有机碳密度的最大值[(6.71±1.72) kg·m-2]和最小值[(1.14±0.11) kg·m-2]分别出现在杉木林土层0~15 cm和马尾松林土层40~60 cm。土层0~60 cm的有机碳密度平均值按大小顺序排列为：杉木林（19.60 kg·m-2）>毛竹林（18.85 kg·m-2）>桉树林（12.91 kg·m-2）>马尾松林（8.47 kg·m-2）。桉树林、杉木林、马尾松林和毛竹林土层0~15 cm有机碳密度所占的比例分别为25.12%、34.25%、52.07%和32.64%。4种森林类型土壤有机碳质量分数和有机碳密度均随着土层深度的增加呈降低的趋势。
이계북지구안수(Eucalyptus grandis×E. urophylla)림、삼목(Cunninghamia lanceolata)림、마미송(Pinus massoniana)림화모죽(Phyllostachys edulis)림적토층0~60 cm토양위연구대상，대비분석료4충삼림류형적토양유궤탄질량분수급밀도분포특정。결과표명：（1）재4충삼림류형토층중，유궤탄질량분수적최대치[(49.49±1.16) g·kg-1]화최소치[(4.50±0.52) g·kg-1]분별출현재모죽림토층0~15 cm화마미송림토층45~60 cm。토층0~60 cm유궤탄질량분수평균치안대소순서배렬위：모죽림(28.16 g·kg-1)>삼목림(25.10 g·kg-1)>안수림(14.52 g·kg-1)>마미송림(9.56 g·kg-1)。안수림、삼목림、마미송림화모죽림토층0~15 cm유궤탄질량분수소점적비례분별위28.29%、39.14%、55.44%화43.94%。（2）4충삼림류형토층중유궤탄밀도적최대치[(6.71±1.72) kg·m-2]화최소치[(1.14±0.11) kg·m-2]분별출현재삼목림토층0~15 cm화마미송림토층40~60 cm。토층0~60 cm적유궤탄밀도평균치안대소순서배렬위：삼목림（19.60 kg·m-2）>모죽림（18.85 kg·m-2）>안수림（12.91 kg·m-2）>마미송림（8.47 kg·m-2）。안수림、삼목림、마미송림화모죽림토층0~15 cm유궤탄밀도소점적비례분별위25.12%、34.25%、52.07%화32.64%。4충삼림류형토양유궤탄질량분수화유궤탄밀도균수착토층심도적증가정강저적추세。
Based on the soil horizons of 0-60cm of Eucalptus grandis×E. urophylla forest, Cunninghamia lanceolata forest, Pinus massoniana forest and Phyllostachys edulis forest planted in northern Guangxi, which the distribution characteristics of the soil organic carbon content and soil organic carbon density had studied. The results showed that the maximum value and minimum value of soil organic carbon content were occurred at the soil horizons of 0-15 cm [(49.49±1.16) g·kg-1] of the Phyllostachys edulis forest and at the soil horizons of 45-60 cm [(4.50 ±0.52) g·kg-1] of the Pinus massoniana forest, respectively. The average value of the soil organic carbon content at the soil horizons of 0-60cm of the four forest types arranged as the following order:Phyllostachys edulis forest (28.16 g·kg-1)>Cunninghamia lanceolata forest (25.10 g·kg-1)>Eucalptus grandis×E. urophylla forest (14.52 g·kg-1)>Pinus massoniana forest (9.56 g·kg-1). The proportion of soil organic carbon content at the soil horizons of 0-15cm of the Eucalptus grandis×E. urophylla forest, Cunninghamia lanceolata forest, Pinus massoniana forest and Phyllostachys edulis forest were 28.29%, 39.14%, 55.44% and 43.94%, respectively. The maximum value and minimum value of the soil organic carbon density were occurred at the soil horizons of 0-15 cm [(6.71±1.72) kg·m-2] of the Cunninghamia lanceolata forest and at the soil horizons of 45-60 cm [(1.14±0.11) kg·m-2] of the Pinus massoniana forest, respectively. The average value of the soil organic carbon density at the soil horizons of 0-60cm of the four forest types arranged as the following order: Cunninghamia lanceolata forest (19.60 kg·m-2) >Phyllostachys edulis forest (18.85 kg·m-2)>Eucalptus grandis×E. urophylla forest (12.91 kg·m-2)>Pinus massoniana forest (8.47 kg·m-2). The proportion of the soil organic carbon density at the soil horizons of 0-15 cm of the Eucalptus grandis×E. urophylla forest, Cunninghamia lanceolata forest, Pinus massoniana forest and Phyllostachys edulis forest were 25.12%, 34.25%, 52.07%and 32.64%, respectively. The soil organic carbon content and the soil organic carbon density of the four forest types had a decreased trend with the soil horizons increasing.