常绿阔叶林植物叶片 N、P 化学计量特征对毛竹扩张的响应

Subjects: Biology >> Botany submitted time 2022-10-27 Cooperative journals: 《广西植物》

王琳 欧阳明 宋述望 曾小霞 宋庆妮 刘骏 方熊 栾丰刚 杨清培

Abstract： The difference of survival response of plants at different levels in evergreen broadleaved forest to the Phyllostachys edulis expansion were explained from the perspective of ecological stoichiometry homeostasis. Using the method of space-time substitution, a typical P. edulis evergreen broadleaved forest interface including P. edulis forest, P. edulis broadleaved mixed forest and evergreen broadleaved forest was selected in Jinggangshan National Nature Reserve, Jiangxi Province. The N and P content of soil and leaves of P. edulis, broadleaved trees, shrubs and herbaceous plants in each forest were compared and analyzed. (1) From bamboo forest to evergreen broadleaved forest, the soil N content and N:P ratio increased, while soil P content decreased; the leaves P content of tree species Machilus thunbergii, Alniphyllum fortunei and Daphniphyllum macropodum decreased and the N:P ration increased. Unlike the trees, the leaf N and P stoichiometry characteristic of plants both in shrub and herbaceous layers showed no significant changes, except the shrub tree Lindera erythrocarpa. (2) The soil N:P ration was positively correlated with the leaf N:P of trees, negatively correlated with that of shrubs and had no correlations with that of herbaceous plants, respectively. (3) The leaves N and P content and N:P ratio for P. edulis remained stable.P. edulis expansion changes plant leaf N and P stoichiometry characteristic by altering the soil N and P stoichiometry characteristic. Shrubs and herbaceous plants are less affected, however, it caused the imbalance of plants N and P stoichiometry characteristic of tree layer plants, which may be an important reason for the death of tree species in the evergreen broadleaved forest.

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