色季拉山急尖长苞冷杉林生长季倒木分解释放CO_2通量动态特征

Dynamic Characteristics of CO_2 Flux Released by Dead-and-down of Abies georgei var.smithii at Growing Season in Sejila Mountain Virgin Forest

通过对色季拉山急尖长苞冷杉(Abies georgei var.smithii)原始林内倒木分解释放CO2通量进行测定,分析了其生长季动态变化特征。结果表明:不同腐烂等级倒木分解释放CO2通量日变化不大,但随着倒木腐烂程度的加深,倒木释放CO2通量呈增大趋势,表现为3级腐烂>2级腐烂>1级腐烂,且差异显著(P<0.05);不同腐烂等级倒木随季节变化其CO2通量具有相同的变化规律,均表现为8月>6月>10月>4月;不同腐烂等级倒木释放的CO2通量都有随温度升高而增强的趋势,但增强幅度不同,1级腐烂增强幅度最小,2级腐烂次之,3级腐烂最大。

The dynamic changing characteristics of Abies georgei var.smithii forest at growing season were analyzed by CO2 flux determination of dead-and-down of Abies georgei var.smithii virgin forest in Sejila mountain.The results showed that the CO2 fluxes emitted by dead-and-down in different decay classes changed little.Along with dead-and-down decay exacerbated,the CO2 flux increased,the order was third class〉 second class〉 first class,the difference was significant among the three classes.The CO2 fluxes of all decay classes of dead-and-down had the same changing regular pattern,which was August〉June 〉October 〉April.The CO2 fluxes of different decay classes of dead-and-down increased along with the increase of temperature,but the increasing amplitude was different,the increasing amplitude of the first class was lowest,the second class was medium,the third class was the maximum.