Contributions of Litter-fall to Soil Respiration and Its Affacting Factors in Southern Subtropical Forests of China
Three main types of Soil respirations(S + L and S) in southern subtropical forests in Dinghushan biosphere reserve were consecutively being monitored over 31 months by the approach of static chamber-gas chromato-graph techniques. Research shows that: annual mean contribution rates of litter-fall to soil respiration in the monsoon evergreen broadleaf forest (BF) , mixed broadleaf-coniferous forest (MF) and coniferous (pine) forest (PF) reached 27. 82% 、33.29% 和 36. 35% respectively; Moreover, all three types of forests displayed the same seasonal dynamic features with the peaks contributions of them were from April to September, which accounts for 71.87% 、61.89% and 70.39% of annual total contributions of litter-fall to soil respiration respectively. Soil respiration ( S + L) had an obviously positive relationship with the seasonal changes of litter-fall input(P <0.001; And soil water content had a significant impact on the contribution of litter-fall to soil respiration in the three types of forests (P<0.001) ; Soil temperature had positive correlativity with soil respiration flux, though it has no distinctive relationship with contribution of litter-fall to soil respiration; the contribution ratios of litter-fall to soil respiration on rainy days were 28. 63% 、38. 20% and 40. 12% respectively, which were significantly higher than those in the sunny days in the three types of forests.
NETL
NSTL
万方数据
维普
