贵州白云岩地区植物群落叶片-凋落物-土壤化学计量与碳氮同位素特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 贵州白云岩地区植物群落叶片-凋落物-土壤化学计量与碳氮同位素特征 DOI: 10.5846/stxb202107141888 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 贵州省世界一流学科建设计划项目（黔教科研发[2019]125号） Leaf-litter-soil stoichiometry and carbon and nitrogen isotopes of plant communities in dolomite district in Guizhou Province Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:剖析天然次生林生态化学计量与C、N同位素丰度的关系，能够阐明元素平衡对同位素分馏的影响规律，深刻揭示生态系统资源分配机制与利用策略。以贵州白云岩地区马尾松林（Pinus massoniana forest）、山胡椒林（Lindera glauca forest）、烟管荚蒾林（Viburnum utile forest）、化香林（Platycarya strobilacea forest）和白栎林（Quercus fabri forest）为对象，厘清叶片-凋落物-土壤连续体的生态化学计量特征与C、N同位素丰度及其内在关联。结果表明：（1）不同群落叶片、凋落物、土壤C、N、P含量存在差异，总体为叶片>凋落物>土壤，N在连续体间的继承性较强，C则较弱。（2）不同植物群落连续体间C ∶ N、C ∶ P、N ∶ P差异显著，5种群落均受到N元素限制，化香林和白栎林还受P限制；烟管荚蒾林C ∶ N、C ∶ P与化香林N ∶ P显著性较高，植物通过协调化学计量平衡以满足自身生长发育和适应环境的需求。（3）叶片、凋落物、土壤δ13C分别为-32.45‰--29.22‰、-30.11‰--28.85‰、-26.06‰--6.83‰，δ15N依次为-8.36‰--1.17‰、-6.79‰--2.22‰、3.22‰-7.12‰，总体上元素迁移转化存在一致性。（4）叶片-凋落物-土壤连续体中，化学计量与δ15N的相关性高于δ13C，土壤化学计量与δ13C、δ15N具有更强的耦合效应。结果可为贵州白云岩地区生态系统养分科学管理提供理论依据。 Abstract:he relationship between the ecological stoichiometry of natural secondary forests and carbon and nitrogen isotopic abundance was analyzed to clarify the influence of element balance on isotope fractionation, as well as the ecosystem resource allocation mechanism and utilization strategy. The Pinus massoniana forest, Lindera glauca forest, Viburnum utile forest, Platycarya strobilacea forest, and Quercus fabri forest of dolomite district in Guizhou Province were used as the research objects to clarify the leaf-litter-soil C:N:P stoichiometry, carbon and nitrogen isotopic abundance and their intrinsic relationship. The results showed that:(1) there is a difference between carbon, nitrogen, and phosphorus contents in leaves, litter, and soil of different communities. The overall order is leaf> litter> soil. The inheritance of nitrogen in the continuum is strong, while carbon is weak. (2) The differences between C:N, C:P, and N:P ratios among the continuum of different plant communities are significant. The five communities are all restricted by nitrogen, while the Platycarya strobilacea forest and Quercus fabri forest are also restricted by phosphorus. (3) The δ13C values of leaves, litter, and soil are -32.45‰—-29.22‰, -30.11‰—-28.85‰, -26.06‰—-6.83‰, and the δ15N values are -8.36‰—-1.17‰, -6.79‰—-2.22‰, 3.22‰-7.12‰, respectively. Generally, there is consistency in the migration and transformation of elements. (4) In the leaf-litter-soil continuum, the correlation between stoichiometry and δ15N is higher than that of δ13C. Soil stoichiometry has a strong coupling effect with δ13C and δ15N. The results can provide theoretical references for the scientific management of ecosystem nutrients in dolomite district in Guizhou Province. 参考文献 相似文献 引证文献