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基于 6 1个土壤剖面的数据 ,分析了鼎湖山自然保护区 4种自然植被类型 (沟谷雨林、季风常绿阔叶林、山地常绿阔叶林和山地灌木草丛 )和 4种次生植被类型 (马尾松针叶林、针阔混交林、次生季风常绿阔叶林和常绿灌丛 )的土壤有机碳贮量及其分配特征。结果如下 :(1)各植被类型土壤有机碳含量随深度增加而减少 ,但植被类型不同其减少程度不同。除 >4 0 cm土层外 ,自然植被类型的土壤有机碳含量明显高于次生植被类型。 (2 )土壤碳密度和土壤有机碳含量一样随深度增加而减少。两大植被类型间比较 ,除山地灌木草丛 >4 0 cm土层外 ,自然植被类型各个土层土壤碳密度都高于所有的次生植被类型对应的碳密度。对于整个土层而言 ,各植被类型土壤碳密度在 30 .9～ 12 7.9t/ hm2间 ,总平均为 73.9t/ hm2。 (3)各植被类型的土壤厚度平均为36 .7～ 73.3cm,总平均为 5 6 .4 cm。除了山地常绿阔叶林外 ,土壤厚度基本上沿海拔高度增加而减少。 (4)保护区各植被类型总面积为 10 2 8.4 hm2 ,土壤总碳贮量为 72 2 87.0 t,其中 0～ 10、10～ 2 0、2 0～ 4 0 cm和 >4 0 cm四个土层分别占 32 .0 %、2 0 .6 %、2 5 .8%和 2 1.6 %。自然植被土壤碳贮量在表层 (0～ 2 0 cm)的比重比次生植被的高。所有的植被类型中 ,混交林碳贮量贡献?
Based on the data of 6 1 soil profiles, four types of natural vegetation (gulch rain forest, monsoon evergreen broad-leaved forest, mountain evergreen broad-leaved forest and mountain shrub grass) and four secondary vegetation types (Pinus massoniana coniferous forest, coniferous-broadleaved mixed forest, secondary monsoon evergreen broad-leaved forest and evergreen shrub). The results are as follows: (1) The content of soil organic carbon in each vegetation type decreased with depth, but the degree of decrease was different with different vegetation types. Except for> 400 cm soil layer, the soil organic carbon content of natural vegetation types was significantly higher than that of secondary vegetation types. (2) Soil carbon density and soil organic carbon content decreased with increasing depth. Comparing the two vegetation types, the soil carbon density of each soil layer of natural vegetation types was higher than that of all the secondary vegetation types except for the mountainous shrub grass> 400 cm soil layer. For the entire soil layer, the soil carbon density of each vegetation type ranged from 30.9 to 129.9 t / hm2 with a total average of 73.9 t / hm2. (3) The average soil thickness of each vegetation type was 36.7 ~ 73.3cm with a total average of 56.4 cm. Except for the evergreen broad-leaved forest in the mountainous area, the thickness of the soil basically decreases along with the increase of altitude. (4) The total area of each vegetation type in the nature reserve is 10 2 8.4 hm2, and the total soil carbon storage is 72 2 87.0 t, of which 0 to 10, 10 to 20,2 0 to 40 cm and> 40 cm Soil layers accounted for 32.0%, 20.6%, 25.8% and 21.6% respectively. Natural vegetation soil carbon storage in the surface layer (0 ~ 20 cm) than the secondary vegetation higher. Of all vegetation types, contribution of carbon storage in mixed forests?