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.

In order to explain the difference of survival response of plants at different levels in evergreen broad-leaved forest to the Phyllostachys edulis expansion from the perspective of ecological stoichiometry homeostasis, this study used the method of space-time substitution, a typical P. edulis evergreen broad-leaved forest interface including P. edulis forest, P. edulis broad-leaved mixed forest and evergreen broad-leaved forest was selected in Jinggangshan National Nature Reserve, Jiangxi Province. The N and P contents of soil and leaves of P. edulis, broad-leaved trees, shrubs and herbaceous layer plants in each forest were compared and analyzed. The results were as follows:(1)From bamboo forest to evergreen broad-leaved forest, the soil N content and N:P increased, while soil P content decreased; the leaf P contents of tree species(Machilus thunbergii, Alniphyllum fortunei and Daphniphyllum macropodum)decreased and the N:P increased. Unlike the trees, the leaf N and P stoichiometric characteristics of plants both in shrub and herbaceous layers showed no significant change, except the shrub tree Lindera erythrocarpa.(2)The soil N:P was positively correlated with the leaf N:P of trees, negatively correlated with that of shrubs and had no correlation with that of herbaceous plants, respectively.(3)The leaf N and P contents and N:P for P. edulis remained stable. In conclusion, P. edulis expansion changes plant leaf N and P stoichiometric characteristics by altering the soil N and P stoichiometric characteristics. Shrubs and herbaceous plants are less affected, however, it causes the imbalance of plant N and P stoichiometric characteristics of tree layer plants, which may be an important reason for the survival of tree species in evergreen broad-leaved forest. [ABSTRACT FROM AUTHOR]