摘要
选取鼎湖山3种植被类型(季风常绿阔叶林,针阔叶混交林和马尾松林),按0～15,15～30,30～45cm土层取样,测量了各土层土壤有机碳(SOC)质量分数,熏蒸培养法测量了微生物生物量碳(Cmic),同时用气象色谱法测量了地表和土壤15、30、45、60cm处CO2体积分数,并用静态箱/碱石灰吸收法测量了土壤呼吸速率。结果如下:(1)随土层的加深,SOC质量分数降低,0～15cmSOC显著高于其他两层,季风常绿阔叶林SOC显著高于其他两种植被类型;(2)土壤碳密度和土壤有机碳含量垂直分布规律一致,0～15cm土壤碳密度显著高于其他两层;(3)0～30cm土层微生物生物量占总土壤微生物生物量的81%～92%,随土层加深微生物生物量迅速降低。微生物生物量和土壤有机碳的比值表明,三种植被类型土壤均处于土壤碳积累中,深层土壤碳积累程度高于表层;(4)土壤CO2浓度随土层的加深迅速升高,主要与土壤透气性有关。
Soil samples were collected in 0～15, 15～30 and 30～45cm soil depth in February and July 2003 in three typical forest types in DBR. Soil organic carbon （SOC）, soil microbial biomass carbon （Cmic） were measured. CO2 concentrations of soil surface and in the 15, 30, 45, 60 cm depth soils, and soil respiration rates were measured at the same time. The results were as follows： （1） SOC decreased with soil depth, with the significantly higher content in 0～15 cm layer than those in other two layers. SOC content in BF is significantly higher than that in MF and PF. （2） Soil carbon density also decreased with soil depth, with the significantly higher content in 0～15 cm layer than those in other two layers. （3） Cmic decreased quickly with the depth of soil, with 81-92% of Cmic existing in 0～30 cm deep soils. The Cmic to SOC ratios （I .46～5.92%） of different soil profiles suggested that SOC were in accumulation, and the accumulation rates increased with soil depth, which suggesting that SOC were transfered from surface soil to deep soil. （4） Soil CO2 concentration increased sharply with soil depth, this might be ascribed to the very low CO2 diffusivity at deep soils.
出处
《生态环境》
CSCD
北大核心
2006年第3期611-615,共5页
Ecology and Environmnet
基金
国家重点基础研究发展计划(2002CB410803)
国家自然科学基金项目(3017019)
关键词
土壤有机碳
土壤微生物生物量
土壤CO2
垂直分布
鼎湖山
soil organic carbon
soil microbial biomass
soil CO2 concentration
vertical distribution
Dinghushan Biosphere Reserve
