Stoichiometric characteristics of C,N and P in leaf-litter-soil of different Eucalyptus varieties
[Objective] This study analyzed the distribution pattern and stoichiometric characteristics of carbon (C),nitrogen (N) and phosphorus (P) in different Eucalyptus plantations on the Leizhou Peninsula to provide theoretical basis for scientific management.[Method] E.camaldulensis,E.pellida,E.torellianaand E.urophylla fast-growing forest stands were selected to measure and analyze contents and stoichiometric characteristics of C,N and P in leaf,litter,and soil(0-20 cm) with P.elliottii× P.oaribaea as control.[Result] Organic C and total N contents of different Eucalyptus plantations showed the order of leaf ＞ litter＞soil with significant differences.Total N contents of Eucalyptus plantations in leaf were significantly higher than the control while organic C had opposite results.Total N content of E.torellianain litter was higher or significantly higher than other Eucalyptus plantations,but was not significantly different from that of P.elliottii× P.oaribaea.Total P content in soil of control was significantly higher than that of the four Eucalyptus plantations.The litter C/N ratios were 39.43-63.35,indicating that litter decomposition rate was low and restricted by N.The soil C/N ratios in 8 years old E.camaldulensis and 10 years old E.pellida were significantly higher than that of 10 years old E.torelliana,15 years old E.urophylla and P.elliottii× P.oaribaea,demonstrating that older plantations soil had faster nitrogen mineralization rate.The correlation analysis showed that the C,N and P in ecosystem realized transportation and transforma tion among plants,litter and soil.[Conclusion] The litter decomposition rates of Eucalyptus plantations and P.elliottii× P.oaribaea on the Leizhou Peninsula were slow and restricted by N element.Compared to the four Eucalyptus plantations,P.elliottii× P.oaribaea had better nutrient utilization efficiency and carbon sequestration capacity.Different Eucalyptus types and P.elliottii)× P.oaribaea had different growth restrictive elements.Therefore,balanced fertilization was needed to prevent soil degradation in these fast growing pine and Eucalyptus plantations.
NETL
NSTL
万方数据
维普
