论文部分内容阅读
对桂林丫吉村岩溶试验场1号洼地出口泉进行了岩溶水HCO_3~-输出碳的年内变化监测和模拟灰岩土壤系统水排碳作用的实验分析,野外土壤剖面中CO_2浓度和排放强度变化的观测,土壤碳和岩溶水无机碳的δ~(13)C大测定,提出土壤碳转移是岩溶水排碳作用的物理基础,因而其所表现的对大气CO_2汇效应实际上是生物作用下土壤有机碳分解释放向系统外的排出.供试系统的汇效应达到21～26 tC/(km~2.a),系统在春、夏、秋和冬季的汇、源效应的强度比分别为0.077,0.099,0.002,0.004.
The annual variation monitoring of HCO_3 ~ - output carbon in karst water and the experiment of simulating water and carbon emission in the soil system of limestone were carried out on the exit spring of the depression of Kiyarum Karst Experimental Site No. 1 in Guilin. The variation of CO_2 concentration and emission intensity in field soil profile Observations, δ ~ (13) C measurements of soil carbon and karst water inorganic carbon suggest that soil carbon transfer is the physical basis of karst water carbon emission. Therefore, the effects of atmospheric CO 2 sinks on the soil are actually biological Organic carbon decomposition release to the outside of the system.The sink effect of the test system reached 21 ~ 26 tC / (km ~ 2.a), and the intensity ratio of source and sink effects of the system in spring, summer, autumn and winter were 0.077 , 0.099, 0.002, 0.004.