武夷山不同海拔高度土壤有机碳矿化速率的比较  

Mineralization rates of soil organic carbon along an elevation gradient in Wuyi Mountain of Southeast China

作　　者：周焱[1] 徐宪根[1] 阮宏华[1] 汪家社 方燕鸿 吴焰玉 徐自坤 

机构地区：[1]南京林业大学森林资源与环境学院,江苏省林业生态工程重点实验室,南京210037 [2]福建武夷山自然保护区管理局,福建武夷山354300

出　　处：《生态学杂志》2008年第11期1901-1907,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30370256和30670313);中国森林生态系统服务功能定位观测与评估技术研究资助项目(200704005/wb02)

摘　　要：应用土壤培养法,比较分析了武夷山不同海拔高度土壤在25℃和60%田间饱和含水量条件下培养110d有机碳矿化速率和矿化率的差异。结果表明:不同海拔高度土壤有机碳矿化速率随海拔高度的升高而加快,高山草甸(0.08gCO2-C.kg-1.d-1)分别比亚高山矮林、针叶林、常绿阔叶林快14.3%、60.0%和166.7%,差异主要存在于0～10cm。土壤碳矿化率以针叶林最高(16.6%),分别比亚高山矮林、常绿阔叶林、高山草甸高37.0%、67.6%和79.1%。土壤有机碳矿化速率和矿化率均随土层加深而递减,递减的幅度在不同海拔高度土壤间存在显著差异(P<0.05)。研究结果揭示,土壤碳矿化速率和矿化比率随着海拔高度的变化而产生显著的变化。With incubation test, this paper studied the mineralization rate and mineralization ratio of soil organic carbon （SOC） along an elevation gradient in the Wuyishan National Nature Reserve of Fujian Province, Southeast China. Soil samples with a field water capacity of 60% were incubated at 25℃over 110 days. The mineralization rate of SOC increased with increasing elevation, and that in 0-40cm layer under alpine meadow （0. 08 g CO2-C · kg^-1· d^-1） was 14. 3% , 60. 0% , and 166.7% greater than that under dwarf forest, coniferous forest, and evergreen broadleaf forest, respectively, with the difference mainly existed in 0-10 cm layer. The mineralization ratio of SOC in 0-40 cm layer under coniferous forest （ 16. 6% ） was 37.0% , 67.6% , and 79. 1% higher than that under dwarf forest, evergreen broadleaf forest, and alpine meadow, respectively. The mineralization rate and mineralization ratio of SOC decreased with soil depth, and the decrement differed significantly （P 〈 01 05 ） with the soils at different elevations. It was suggested that elevation gradient had significant effects on the mineralization rate and mineralization ratio of SOC.

关 键 词：植被类型 海拔 土壤有机碳 矿化速率 矿化率 

分 类 号：S154[农业科学—土壤学]