植物生态学报 ›› 2023, Vol. 47 ›› Issue (7): 932-942.DOI: 10.17521/cjpe.2022.0128

所属专题: 生态化学计量

• 研究论文 • 上一篇    下一篇

邻域树种多样性对杉木叶片氮磷生态化学计量比的影响

冉松松1, 余再鹏1,*(), 万晓华1, 傅彦榕1, 邹秉章2, 王思荣2, 黄志群1   

  1. 1福建师范大学地理科学学院, 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
    2福建省上杭白砂国有林场, 福建上杭 364305
  • 收稿日期:2022-04-08 接受日期:2022-10-11 出版日期:2023-07-20 发布日期:2023-07-21
  • 通讯作者: *余再鹏(zaipengyu@fjnu.edu.cn)
  • 基金资助:
    国家自然科学基金(31930077);国家自然科学基金(31625007);国家自然科学基金(31901162);中国博士后科学基金(2020T130100)

Effects of neighborhood tree species diversity on foliar nitrogen-phosphorus stoichiometry of Cunninghamia lanceolata

RAN Song-Song1, YU Zai-Peng1,*(), WAN Xiao-Hua1, FU Yan-Rong1, ZOU Bing-Zhang2, WANG Si-Rong2, HUANG Zhi-Qun1   

  1. 1School of Geographical Science, Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fujian Normal University, Fuzhou 350007, China
    2Shanghang Baisha State-owned Forest Farm, Shanghang, Fujian 364305, China
  • Received:2022-04-08 Accepted:2022-10-11 Online:2023-07-20 Published:2023-07-21
  • Contact: *YU Zai-Peng(zaipengyu@fjnu.edu.cn)
  • Supported by:
    The National Natural Science Foundation of China(31930077);The National Natural Science Foundation of China(31625007);The National Natural Science Foundation of China(31901162);The China Postdoctoral Science Foundation(2020T130100)

摘要:

生物多样性丧失威胁生态系统功能, 研究生物多样性对植物生态化学计量比的影响, 有利于深入评估生物多样性对生态系统功能的影响机制。该研究利用亚热带地区大型野外树种多样性实验平台, 选取不同树种丰富度(1、4、8、16、32)样地中的杉木(Cunninghamia lanceolata)为目标树种, 探讨邻域树种丰富度、邻域树种与目标树间的性状差异以及邻体竞争对目标树杉木叶片氮(N)、磷(P)含量及N:P的影响。主要研究结果: (1)邻域树种与目标树根组织密度差异显著降低了杉木叶片N含量, 而比根长差异显著增加了杉木叶片P含量。(2)邻域树种竞争显著降低了杉木叶片N含量和N:P。(3)邻体竞争指数和比根长差异的交互作用, 以及邻域树种丰富度和比根长差异的交互作用均显著降低了杉木叶片P含量。即比根长差异对杉木叶片P含量的正影响随着邻域树种丰富度的增加而降低, 比根长差异对杉木叶片P含量的正影响也随着邻体竞争的增加而降低。(4)邻域树种丰富度和邻域系统发育差异的交互作用显著提高了杉木叶片N:P。邻域系统发育差异对杉木叶片N:P的负效应随着邻域树种丰富度的增加而降低。综上, 杉木与功能性状差异较大的树种混交显著提高杉木叶片P含量, 而邻域树种竞争降低了杉木叶片N含量。在杉木与多树种混交时, 树种间功能性状差异有助于减缓种间竞争带来的不利影响, 提高杉木叶片N:P, 进而有利于其生长。

关键词: 树种丰富度, 性状差异, 生态位互补, 竞争, 养分

Abstract:

Aims Biodiversity loss threatens ecosystem functions. Investigating the effect of biodiversity on the ecological stoichiometry of plant nutrients, therefore, can help reveal the mechanisms of the effect of biodiversity on ecosystem functions.

Methods Using a tree species diversity experiment in subtropical China, Cunninghamia lanceolatafrom plots with different tree species richness (1, 4, 8, 16, 32) were selected as focal tree species. The effects of neighborhood species richness (NSR), functional trait dissimilarities between neighborhood tree species and the focal tree, neighborhood competition index (NCI) on foliar nitrogen (N), phosphorus (P) content and N:P of C. lanceolata were investigated.

Important findings (1) The results showed that the dissimilarity in specific root length (SRL_diss) between neighborhood trees and focal trees significantly increased the foliar P content of C. lanceolata, while the dissimilarity in root tissue density (RTD_diss) significantly decreased the foliar N content of C. lanceolata. (2) Neighborhood competition significantly decreased the foliar N content and N:P of C. lanceolata. (3) The interaction effects of NCI and SRL_diss, as well as the interaction between NSR and SRL_diss significantly reduced the foliar P content of C. lanceolata. The result indicates that the positive effect of SRL_diss on the foliar P content of C. lanceolata decreased with increasing NSR, and the positive effect of SRL_diss on the foliar P content of C. lanceolata decreased with increasing NCI. (4) The interaction between NSR and phylogenetic dissimilarity (NP_diss) significantly increased foliar N:P of C. lanceolata, demonstrating that the negative effect of NP_diss on the foliar N:P content of C. lanceolata decreased with increasing NSR. Our results indicated that the foliar P content of C. lanceolata was significantly enhanced by mixing with tree species with different trait dissimilarities, while foliar N content of C. lanceolata was decreased by neighborhood competition. Tree species richness can help mitigate the adverse effects of interspecific competition on C. lanceolata through niche complementation when mixing with species that have greater trait dissimilarity.

Key words: tree species richness, trait dissimilarity, niche complementarity, competition, nutrient