土壤碳作为湿润亚热带表层岩溶作用的动力机制:系统碳库及碳转移特征  

Soil carbon as dynamic mechanism for epikarstification in humid subtropical region: Evidence of carbonreservoirs and transfer in the system

作　　者：潘根兴[1] 曹建华 何师意 陶于祥[1] 孙玉华[1] 滕永忠 

机构地区：[1]南京农业大学资源与环境科学学院,南京210095 [2]桂林岩溶地质研究所及岩溶动力学开放实验室,桂林541004

出　　处：《南京农业大学学报》1999年第3期49-52,共4页Journal of Nanjing Agricultural University

基　　金：国家自然科学基金;岩溶动力学开放实验室资助

摘　　要：以桂林丫吉村岩溶实验场为例， 分析了表层带岩溶系统中碳库组成， 测定了各碳库的碳稳定性同位素丰度， 表明土壤碳是系统中最大的碳库， 生物的 Ｃ Ｏ２ 吸收同化与土壤有机质分解导致的土壤 Ｃ Ｏ２ 释放是系统中主导的碳流通过程， 系统活动态碳组分主要由土壤碳贡献， 从而揭示了土壤碳对表层岩溶作用的动力机制。Taking an example of Guilin Yaji Karst Experiment Site,carbon reservoirs and their stable isotope abundance were analysed of the epikarst system,and CO 2 concentration in air of plant system and its relation to soil respiration CO 2 emmission were monitored.The results showed that soil carbon was the biggest carbon reservoir in the system,plant CO 2 absorption from air and soil CO 2 respiration emmission were the predominant process of carbon fluxes in the system.The labile carbon forms mainly expressed as CO 2 in the system was dominantly derived from soil carbon.Consequently,the dynamic mechanism of soil carbon for epikarst system in humid subtropical karst region was revealled.

关 键 词：表层岩溶系统 碳库 碳转移 土壤碳 

分 类 号：S153.61[农业科学—土壤学]