C, N and P Stoichiometric Characteristics of Plants and Soil in Quercus liaotungensis Forest on Ziwuling Mountain of Loess Plateau
In this study,the contents of carbon(C),nitrogen(N) and phosphorus(P) in plants,litter and soil were determined at three different ages in Quercus liaotungensis forests (young,near-mature and mature forest) in Ziwuling area of Loess Plateau.The results showed that the contents of C,N and P varied in different plants organs,which were in the range of 245.3～492.6 g/kg,1.57～20.6 g/kg and 0.11～1.63 g/kg,respectively.The contents of C,N and P in plant litter were in the range of 283.5～329.0 g/kg,11.5～13.2 g/kg and 0.73～1.06 g/kg,respectively.There was no significant difference in plant C content among Quercus liaotungensis forests at different ages,while the contents of N and P in plants and the contents of C,N and P in litter and soil significantly differed with forest age.With the increasing forest age,the ratios of C ∶ N and C ∶ P in plant leaves and the ratios of C ∶ N,C ∶ P and N ∶ P in plant litter significantly increased,N ∶ P ratio in plant leaves,as well as C ∶ P ratio in soil,increased at first and then decreased,C ∶ N ratio in soil greatly decreased and N ∶ P ratio in soil did not obviously change.Positive correlations existed between plant and soil for both N and P contents,showing that the supply of N and P in soil affected the contents of N and P in plant.
soil C, N and Pecological stoichiometric characteristicsQuercus liaotungensisZiwuling
国家科技期刊平台
NSTL
万方数据
维普
