呼伦贝尔沙地樟子松枯落物和土壤碳、氮、磷化学计量特征OA北大核心CSTPCD

To reveal the characteristics of litter and soil C,N,and P stoichiometry and their main driving factors in the Hulunbuir Sandy Land.Different ages of Pinus sylvestris var.mongolica plantation forests and natural for-ests(medium-mature,near-mature,and mature forests)were used as research subjects to analyze the characteris-tics of litter and soil C,N,and P stoichiometry and their correlation with soil factors was explored.(1)The degree of decomposition significantly affected litter C,N,P,and the C:N ratio(P＜0.05)and the soil layer significantly af-fected soil N and C:N and C:P ratios(P＜0.05);however,the stand age of the forest and its interactions with the degree of decomposition and soil layer did not have a significant effect on litter and soil C,N,and P stoichiomet-ric characteristics(P＞0.05).There were significant differences(P＜0.05)between natural and plantation forests in litter and soil relating to C and N contents and C:P and N:P ratios.(2)Litter C content was significantly and posi-tively correlated with litter N and P content(P＜0.05),and the litter C:P ratio was significantly and positively cor-related with the C:N ratio(P＜0.05);the soil C:P ratio was significantly and positively correlated with the soil N:P and C:N ratios(P＜0.05).(3)The C,N,and P stoichiometric characteristics of litter were mainly significantly af-fected by pH,phosphatase,and urease(P＜0.05),and the soil C,N and P stoichiometric characteristics were main-ly significantly affected by pH,phosphatase,and convertase(P＜0.05).The growth of P.sylvestris var.mongolica forest in the Hulunbuir Sandy Land may be limited by nitrogen,whereas the decomposition of litter may be limit-ed by phosphorus;the main drivers of litter and soil C,N,and P stoichiometric characteristics were pH and phos-phatase,respectively.This improved information is of great significance for guiding the management of P.sylves-trisvar.mongolicaforests.