摘要:为揭示不同菌根类型树种细根化学计量学性状对N添加的塑性响应，在福建省建瓯市万木林自然保护区常绿阔叶林内选择外生菌根树种罗浮栲（Castanopsis faberi）和内生菌根树种木荷（Schima superba）为研究对象，采用根袋法开展N添加试验，细根在根袋内生长半年后测定化学计量学指标（C、N、P、C/N、N/P、C/P）。结果表明：根序对细根化学计量学性状有显著影响，随着根序的增加，罗浮栲与木荷细根C浓度、C/N、C/P明显增加，N浓度与P浓度明显下降。N添加对细根C、N浓度均有极显著的促进作用，但对细根P浓度影响不显著，从而导致细根C/N维持稳定，但N/P、C/P升高，细根受P限制增加。细根化学计量学性状对N添加的塑性响应在不同序级间以及在外生菌根树种罗浮栲和内生菌根树种木荷之间均无显著差异。结论表明，研究所选内生、外生菌根树种细根化学计量学性状对N添加具有基本相似的响应。



Abstract:In order to reveal the differences in the plastic responses of fine root stoichiometric traits to nitrogen addition between different mycorrhizal tree species, two tree species, Castanopsis faberi (ectomycorrhizal) and Schima superba (arbuscular mycorrhizal), were selected in an evergreen broad-leaved forest of Wanmulin Nature Reserve, Jianou City, Fujian Province. Root bag method was used to carry out the nitrogen addition experiment. The stoichiometric traits (C, N, P, C/N, N/P, and C/P) were measured after the fine roots have grown in the root bag for half a year. The results showed that root order had a significant effect on the stoichiometric traits of fine roots. With the increase of root order, the C concentration, C/N, and C/P of fine roots of C. faberi and S. superba increased significantly, while the concentrations of N and P decreased significantly. Nitrogen addition had a very significant effect on the concentrations of fine root C and N, but had no significant effect on the concentration of fine root P. As a result, the fine root C/N remained stable, but both N/P and C/P increased after nitrogen addition, indicating increased P limitation in fine roots. There was no difference in the plastic responses of fine root stoichiometric traits to nitrogen addition among different root orders, and between ectomycorrhizal (C. faberi) and arbuscular mycorrhizal tree species (S. uperba) as well. It is concluded that the fine root stoichiometric traits of arbuscular mycorrhizal and ectomycorrhizal tree species had similar responses to N addition in this study.





PDF全文下载地址:

https://www.ecologica.cn/stxb/article/pdf/stxb201907221543