Suppr超能文献

热带森林层次变化与海拔梯度上植物结构多样性-地上碳关系。

Tropical forest strata shifts in plant structural diversity-aboveground carbon relationships along altitudinal gradients.

机构信息

State Key Laboratory of Urban and Regional Ecology, Research Center for Eco⁃Environmental Sciences, Chinese Academy of Sciences, Beijing, China.

Yinggeling Branch Office, National Park of Hainan Tropical Rainforest, Baisha Hainan, China.

出版信息

Sci Total Environ. 2022 Sep 10;838(Pt 1):155907. doi: 10.1016/j.scitotenv.2022.155907. Epub 2022 May 13.

Abstract

Aboveground carbon storage in forests can be influenced by both structural and compositional diversity of plant communities. However, the relative and interactive effects of structural and compositional diversity on multilevel aboveground carbon storage across forest strata and how these relationships vary with altitude and soil nutrients remain unclear. Using data obtained from 34 tropical forest plots (total area 8.5 ha) in Hainan Island, China, we analyzed the relationships between aboveground carbon at four levels (litter, understory, overstory, and whole-community) with structural diversity (diameter and height diversity) and compositional diversity (species diversity and evenness) in the understory and overstory. The direct and indirect effects of altitude, soil nutrients (total N and total P and N/P ratio), structural diversity, and compositional diversity on aboveground carbon were explored via Bayesian structural equation modeling. The results showed that structural diversity, rather than compositional diversity, in overstory stratum determined aboveground carbon. Specifically, overstory structural diversity was negatively associated with understory carbon, while positively associated with overstory and whole-community carbon. Furthermore, diversity‑carbon relationships were slightly affected by soil nutrients but strongly by altitude. Specifically, the relationship between overstory and whole-community carbon content with overstory tree height diversity weakened with altitude, while their relationship with overstory diameter diversity strengthened. Altitude directly and indirectly affected overstory tree height and diameter diversity through overstory species diversity, thereby reducing understory and increasing overstory and whole-community carbon. Altitude directly promoted litter carbon. We provide evidence that the effects of plant diversity on aboveground carbon storage are forest strata- and altitude-dependent. As overstory structural diversity plays a crucial role in storing aboveground carbon at all altitudes, we proposed that focusing on overstory structural diversity would be promising for predicting trends in how plant diversity affects aboveground carbon in response to climate change.

摘要

森林地上碳储量既受植物群落结构多样性的影响,也受其组成多样性的影响。然而,结构多样性和组成多样性对森林各层次多水平地上碳储量的相对和交互影响,以及这些关系如何随海拔和土壤养分而变化尚不清楚。本研究利用中国海南岛 34 个热带森林样地(总面积 8.5 公顷)的数据,分析了地上碳储量在四个水平(凋落物、林下、林冠和整个群落)与林下和林冠结构多样性(直径和高度多样性)和组成多样性(物种多样性和均匀度)之间的关系。通过贝叶斯结构方程模型探讨了海拔、土壤养分(总氮和总磷及 N/P 比)、结构多样性和组成多样性对地上碳的直接和间接影响。结果表明,林冠层的结构多样性而不是组成多样性决定了地上碳储量。具体而言,林冠层结构多样性与林下碳呈负相关,而与林冠和整个群落碳呈正相关。此外,多样性与碳的关系受土壤养分影响较小,但受海拔影响较大。具体而言,林冠和整个群落的碳含量与林冠树木高度多样性的关系随海拔的升高而减弱,而与林冠树木直径多样性的关系则随海拔的升高而增强。海拔通过林冠层物种多样性直接和间接影响林冠层树木高度和直径多样性,从而减少林下植被并增加林冠层和整个群落的碳储量。海拔直接促进了凋落物的碳储量。本研究提供了证据表明,植物多样性对地上碳储量的影响与森林层次和海拔有关。由于林冠结构多样性在所有海拔高度对地上碳储量的存储都起着至关重要的作用,因此我们提出,关注林冠结构多样性有望预测植物多样性如何影响地上碳储量,以应对气候变化。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验