C:N:P stoichiometry of rhizosphere soils differed significantly among overstory trees and understory shrubs in plantations in subtropical China
C:N:P stoichiometry of rhizosphere soils differed significantly among overstory trees and understory shrubs in plantations in subtropical China
复制标题
中国亚热带人工林林下乔木与林下灌木根际土壤C:N:P化学计量差异显着
DOI：
10.1139/cjfr-2018-0095
复制
发表时间：
2018-11-01
影响因子：
2.2
通讯作者：
Shock, Clinton C.
中科院分区：
文献类型：
--
作者：
Dai, Xiaoqin;Fu, Xiaoli;Shock, Clinton C.
根际土壤C:N:P化学计量学有助于确定植物物种与土壤养分的联系，这对森林生态系统的林下植被管理尤其有帮助。对根际土壤化学计量学的研究较少，特别是对林下植物共生的根际土壤化学计量学研究较少。以马尾松为研究对象，研究了马尾松优势乔木和灌木根际土壤C:N:P化学计量特征。，松（Pinus elliottii Engelm）。和杉木杉木（Lamb.）。钩。中国亚热带的种植园。根际土壤C、N、P浓度和比值均显著高于普通土壤，除羊草外，林下乔木高于林下灌木。羊草根际土壤C:N、C:P和N:P与阔叶树根际土壤C:N、C:P差异不显著，但高于米草和木樨草。土壤pH值显著影响土壤C、N、P浓度及其化学计量特征。研究表明，林下乔木和灌木养分状况的差异与灌木种类有关，其中土壤pH值是主导驱动因素。人工林管理应考虑林下灌木种类，以减少物种间的资源竞争。
Rhizosphere soil C:N:P stoichiometry is useful for identifying the linkage of plant species and soil nutrients, which can be particularly helpful for understory vegetation management of forest ecosystems. There has been limited research on rhizosphere soil stoichiometry, especially for co-existing overstory and understory plant species. We investigated the bulk and rhizosphere soil C:N:P stoichiometry of dominant overstory trees and understory shrubs (Adinandra millettii, Eurya muricata, and Loropetalum chinense) in Pinus massoniana Lamb., Pinus elliottii Engelm., and Cunninghamia lanceolata (Lamb.) Hook. plantations in subtropical China. Rhizosphere soil C, N, and P concentrations and ratios increased significantly compared with bulk soil, and those of overstory trees were higher than those of understory shrubs with the exception of L. chinense. Rhizosphere soil C:N, C:P, and N:P of L. chinense were not significantly different with those of overstory trees but were higher than those of A. millettii and E. muricata. Soil pH significantly influenced the profiles produced by soil C, N, and P concentrations and their stoichiometries. This study indicated that the difference in nutrient status between overstory trees and understory shrubs was related to shrub species, in which soil pH was the dominant driving factor. Understory shrub species should be considered in plantation management to reduce resource competition among species.