CO_2摩尔分数倍增对秋茄湿地碳、氮循环影响的模拟

Effect of CO_2 Doubling on Carbon and Nitrogen Circulation in Kandeliacandel Wetland Simulation System

为探知CO_2摩尔分数倍增对秋茄湿地碳、氮物质循环的影响,系统了解CO_2摩尔分数倍增环境下该生态系统中C、N转化过程及机理,采用开顶箱法,分别研究了350、700μmol·mol^(-1)CO_2下典型红树植物,即秋茄湿地模拟系统中C、N质量的变化。结果表明:CO_2摩尔分数倍增引起了水体总碳(TC)、总有机碳(TOC)质量浓度及土壤中总碳(TC)、总有机碳(TOC)质量分数的不显著增加,系统中总碳质量增加了2.8%;水体中总氮(TN)、硝态氮(NO_3^--N)、氨氮(NH_4^+-N)的平均质量浓度分别增加了13.1%、17.7%、8.6%,土壤中TN质量分数下降了8%,系统中总氮质量降低了8.7%。总体上,CO_2摩尔分数倍增,引起湿地系统中碳质量的增加,氮质量的降低。

In order to explore the effect of CO2 concentration doubling on carbon and nitrogen cycling in Kandeliacandel wetland and understand the conversion process and mechanism of carbon and nitrogen, we used the open-top container method to study the carbon and nitrogen in water and soil of mangrove-Kattdeliacattdel wetland simulation system which contained 350 and 700 p^mol/mol CO2 , respectively. CO2 doubling caused the TC and TOC increasing. TC was increased by 2.8%. In water, TN, NO3 and NH4 were increased by 13.3%, 17.7% and 8.6%, respectively. In the soil, TN was decreased by 8%, TN was reduced by 8.7% in the system. Therefore, CO2 doubling caused the C increasing and N decreasing in the system.