Research on Soil Organic Carbon Pool of Typical Natural Dark Coniferous Forests in Sygara Mountains in Tibet
The virgin forest in Tibetan Plateau as an important ecological barrier of China,plays a decisive role on global terrestrial ecosystem carbon balance.This research chose the most two typical natural forest in Sygara Mountain (Abies georgei var.smithii and Picea likiangensis var.linzhiensis) as the object,measured the content of soil organic carbon (SOC) and the soil respiration and its components of the forests,and results showed that the content of SOC and soil microbial biomass carbon (SMBC) of these two kinds of forests had the significant characteristic of surface accumulation.The content of SOC in the surface soil (0～20 cm) accounted for 52.55％(Picea likiangensis var.linzhiensis) and 51.87％(Abies georgei var.smithii) of total SOC content,while the content of SMBC in the surface soil (0～20 cm) accounted for 64.24％ (Picea likiangensis var.linzhiensis) and 65.48％ (Abies georgei var.smithii) of total SMBC content.The maximum value of soil respiration was in August to September,and the minimum value was in December,with the maximum value of soil respiration of these two forests as 6.27 μmol/(m2·s)(Abies georgei var.smithii)and 4.91 μmol/(m2·s)(Picea likiangensis var.linzhiensis).The relationship between SRR and soil temperature and water contents can be described by exponential equation and linear equation.But there was no significant relationship between SRR and soil water content of Abies georgei var.smithii.Microbial respiration had the highest percentage of these two forests,then followed with leaf respiration and root respiration.Microbial respiration had higher percentage in summer and autumn,while root respiration had higher percentage in spring and summer,leaf respiration had higher percentage in late spring and early summer.
NETL
NSTL
万方数据
维普
