Stoichiometric characteristics of carbon, nitrogen and phosphorus of different tree species in Eucalyptus grandis mixed plantation
We explored the C,N,P stoichiometry of fresh leaf,leaf litter and soil in Eucalyptus grandis mixed plantation of Toona ciliate,Alnus formosana,Sassafras tzumu and E.grandis.The results showed that the N ∶ P ratios of fresh leaf,leaf litter and soil ranged from 6.7 to 9.7,8.6 to 9.7,1.6 to 4.0,respectively.For the same components above,the C ∶ N ratios were 29.6 to 62.8,78.4 to 101.8,15.3 to 19.5,and the C ∶ P ratios ranged from 279.9 to 459.3,639.0 to 795.9,24.9 to 77.6,respectively.Among the four tree species,S.tzumu had the highest C storage capacity and N,P utilization efficiency.The leaf litter C ∶ N and C ∶ P of the three associated tree species were lower than that of E.grandis,suggesting that the leaf litter of the associated tree species was more easily decomposed and the associated trees may accelerate N,P cycling rates in the mixed forest.According to the fresh leaf N ∶ P ＜10,we found that E.grandis mixed plantation was considerably limited by N element,and E.grandis was limited more seriously.There were significant differences of soil N,P contents and C ∶ N ∶ P among different tree species,indicating that N,P cycling of Eucalyptus grandis plantation could be changed by the introduction of associated tree species.Moreover,the benefits of associated tree species in mixed plantation ecosystem will increase with forest age.
associated tree speciesEucalyptus grandis plantationnutrient limitationstoichiometry
国家科技期刊平台
NSTL
万方数据
维普
