[Objective]To study the effects of different stand densities on the stoichiometric characteristics of C,N and P in leaves,litter and soil of Robinia pseudoacacia plantation forests,and to provide scientific references for the management of plantation forests in the loess region of western Shanxi Province.[Methods]Based on five different densities(500,1 000,1 500,2000,2 500 plants/hm²)of plantation forests in the loess region of western Shanxi Province,the nutrients of leaves,litter and soil were measured and analysed.The effects of density on the three nutrients were analysed by one-way analysis of variance(AN-OVA),and the correlations between leaf,litter,soil C,N,P and their stoichiometric ratios in plantations were analyzed by Pearson's correlation coefficient.[Result]The C,N and P contents of leaves of planta-tion forest increased and then decreased with the increase of density,and the C∶P and N∶P of leaves decreased and then increased;the C,C∶N,C∶P and N∶P of litter decreased and then increased with the increase of density,and the N and P increased and then decreased;the C,P and N contents and C∶P and N∶P of soil decreased with the increase of density;and the C∶N showed a tendency of decreasing and then increasing with the increase of density.Leaf N∶P was greater than 14 in different stand densit-ies,and there were different significant differences(p<0.05)in leaf-detritus-soil C,N,P and their stoi-chiometric ratios,except for leaf N,C∶N.[Conclusion]Leaf N∶P is greater than 14 in different stand densities,indicating that plantation forests in the study area are mainly P-limited;density affects nutrient cycling and its distribution and stoichiometric characteristics of plantation forests to a certain extent;Robin-ia pseudoacacia plantation forests with densities ranging from 1,000 to 1,500 plants/hm2 have the highest contents of leaf blade,litter,and soil C,N,and P,and the weakest nutrient limitation,and the decomposi-tion rate of litter is relatively fast,which is suitable for the operation of the forests.
Stand densityplantation forestnutrient cyclingstoichiometric characteristics
NETL
NSTL
万方数据
