Characteristics of soil and litter organic carbon and total nitrogen in different age groups of Quercus aliena var.acuteserrata forests in the Qinling mountains
The forest stand Quercus aliena var.acuteserrata is extensively distributed in the Qinling mountains.Forest age plays key roles in stand structure formation,absorption and emission of carbon and nitrogen in individuals.To better understand traits of organic carbon and total nitrogen in mineral soil and litter of Quercus aliena vat.acuteserrata stands with age groups,effects of stand age and limitation of available nutrients in soil for individual growth,samples of litter and mineral soil in the depth 0-40 cm were collected from field and chemical analysis was conducted.The results indicated as following.Organic carbon ranged from 17.61 to 28.31 g/kg in mineral soil and from 260.09 to 316.96 g/kg in litter.Total nitrogen ranged from 1.54 to 1.94 g/k&g in mineral soil and from 13.12 to 16.02 g/kg in litter.The density of soil organic carbon and total nitrogen ranged from 83.33 to 117.33 t/hm2 in mineral soil and from 6.41 to 8.46 t/hm2 in litter.Content of organic carbon both in mineral soil and litter and soil organic carbon density increased with stand age.The same trend was also found in content of total nitrogen in litter.However,the content and density of total nitrogen in mineral soil fluctuated in stand age groups and the maximum values were attained in near-matured stand.The ratio C:N in mineral soil increased with stand age generally and the ratio (18.31 ± 2.25) was highest in matured stand.Content of organic carbon and total nitrogen in mineral soil and litter,and soil organic carbon density were significantly affected by stand age.Growth of Quercus aliena var.acuteserrata was limited by soil available nitrogen.
NETL
NSTL
万方数据
维普
