毛竹扩张对杉木林土壤及杉木叶片氮磷化学计量特征影响OA北大核心CSTPCD

To reveal the ecological stoichiometry mechanism of Phyllostachys edulis expansion effects on the growth of Cunninghamia lanceolata individuals,this study analyzed the N,P concentration and N:P ratio of soil,P.edulis leaf and C.lanceolata leaf(young,mature and litter)in P.edulis-C.lanceolata mixed forest and its adjacent C.lanceolata forest and P.edulis forest by the methods of space-time substitution Jinggangshan National Nature Reserve.The results showed that(1)the soil P concentration was increased by 32.6%,from 0.32 mg·g-1 in the C.lanceolata forest to 0.43 mg·g-1 in P.edulis-C.lanceolata mixed forest.(2)N:P ratio in the mature leaf of C.lanceolata had no variations(13.74)in the three types of forests.However,the P concentration of young leaf was increased,leading to a fall of the N:P ratio by 21.3%.N:P ratio in litters was descended by 13.6%,from 21.64 to 18.69.There was no difference in the leaf N,P concentration and N:P ratio of P.edulis during the expansion process.(3)P.edulis expansion had no significant influences on leaf N and P resorption proficiency of C.lanceolata.These findings indicate that P.edulis has a strong homeostasis ability,and P.edulis expansion can prevent the growth or even cause the death of C.lanceolata by altering the soli P concentration and thus unbalancing the P content and N:P stoichiometry in C.lanceolata.