庐山不同森林植被类型土壤碳库管理指数评价

EVALUATION OF CARBON POOL MANAGEMENT INDEX OF DIFFERENT FOREST TYPES IN LUSHAN

土壤碳库管理指数（CPMI）是表征土壤碳库变化的一个重要量化指标,能够反映土壤的碳库变化和碳库质量。选取庐山8种森林植被类型土壤为研究对象,对其土壤有机碳库特征及碳库管理指数进行系统研究。结论表明：（1）土壤有机碳（SOC）主要分布于0~20 cm土层中,随着土层深度增加,不同森林植被类型下SOC含量急剧下降;在0~60 cm土层中,不同森林植被类型下SOC含量的平均值排序为：马尾松林〈常绿阔叶林〈灌丛〈针阔混交林〈常绿-落叶混交林〈黄山松林〈落叶阔叶林〈竹林。（2）不同森林植被类型下活性有机碳（ASOC）含量为0.24~0.57 g·kg–1,总有机碳（TOC）含量为9.72~14.74 g·kg–1,土壤碳库指数（CPI）为1.63~2.48,碳库活度（A）为0.019~0.062,碳库活度指数（AI）为0.388~1.265。不同森林植被类型下ASOC含量排序：落叶阔叶林〈黄山松林〈常绿-落叶阔叶混交林〈灌丛〈针阔混交林〈常绿阔叶林〈竹林〈马尾松林;不同森林植被类型下ASOC/TOC（%）排序：落叶阔叶林〈黄山松林〈常绿-落叶阔叶混交林〈竹林〈灌丛〈针阔混交林〈常绿阔叶林〈马尾松林;不同森林植被类型下CPMI排序为：落叶阔叶林〈黄山松林〈常绿-落叶阔叶混交林〈灌丛〈针阔混交林〈常绿阔叶林〈竹林〈马尾松林。

Carbon Pool Management Index （CPMI） is deemed to be an important parameter to describe carbon cycle in soil ecosystem, and can reflect the change of carbon pool size well. By selecting 8 sampling plot of different forest types and a contrasted bare slop plot as study objects in the Lushan scenic area, the organic carbon pool characters and management indices were analyzed systematically. Some results were obtained as the follows. First, the soil organic carbon （SOC） was mainly distributed in the soil surface layer （0-20 cm）. With the increase of soil depth, the SOC contents of the soil samples under various forest types all decrease sharply. In the depth of 0-60 cm, the average SOC contents increased in the following order： Pinus massoniana forest 〈 evergreen broad-leaved forest 〈 vegetation 〈 coniferous and broad-leaved mixed forest 〈 evergreen and deciduous mixed forest 〈 Pinus taiwanensishayata forest 〈 deciduous broad-leaved forest 〈 bamboo forest. Moreover, the sequence of the average ASOC contents under different forest types and contrasted bare slop is deciduous broad-leaved forest 〈 Pinus taiwanensishayata forest 〈 evergreen and deciduous broad-leaved mixed forest 〈 vegetation 〈 coniferous and broad-leaved mixed forest 〈 evergreen broad-leaved forest 〈 bamboo forest 〈 Pinus massoniana forest. The percentages of SOC under different forest types increase in the following order： deciduous broad- leaved forest 〈 Pinus taiwanensishayataforest 〈 evergreen and deciduous broad-leaved mixed forest 〈 bamboo forest 〈 vegetation 〈 coniferous and broad-leaved mixed forest 〈 evergreen broad-leaved forest 〈 Pinus massoniana forest. Furthermore, under various forest types, the ASOC contents are 0.24-0.57 g·kg^-1, and the TOC contents are 9.72-14.74 g·kg^-1. At the same time, the CPI contents are 1.63-2.48, and the A contents are 0.019--0.062, while the AI contents are 0.388-1.265. The CMPI under various forest types increase in the following order： deciduous broad-leaved forest 〈 Pinus taiwanensishayataforest 〈 evergreen and deciduous broad-leaved mixed forest 〈 vegetation 〈 coniferous and broad-leaved mixed forest 〈 evergreen broad-leaved forest 〈 bamboo forest 〈 Pinus massoniana forest.