Difference of Litter Carbon Densityi n Natural Secondary Birches-Mongolian Oak Forest
We measured and calculated the carbon density of litter fall in natural secondary birch -mongolian oak forest in the north of Changbai Mountain and Zhangguangcai Mountain .The litter carbon density in 42-year-old birch forest was 2.477 t· hm-2· a-1, and 1.049 t· hm-2· a-1 for 20-year-old birch forest, with difference of 136.13%.Litter carbon density in 20-year -old Mongolic oak forest was 0.948 t· hm-2 · a-1 , and 2.686 t· hm-2 · a-1for the 50-year-old Mongolic oak forest , with the deviation of 183.33%, and with the significance ANOVA result of ( P<0.05) ,which illustrated that forest age was the main factor on affecting the carbon density .The variations of litter carbon density between two forest types had no sig-nificance difference ( P>0.05) although in quantitative terms .The average value of carbon density in litter organs showed outstanding difference (P<0 .05) with leaf, branch, skin, fruit, dung, and ovum in the proper order , and the value rose with the forest age .Seasonal trend of carbon density in birch and Mongolic oak forest was regular and was divided into three stages according to the characteristics of carbon density trend , that was litter fall in growing season , litter fall in stop grow-ing season and winter dormancy with the highest value in the stop growing season , and the lowest in the winter dormancy .
Birch forestMongolian oak forestLitter fallCarbon density
NETL
NSTL
万方数据
维普
