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引用次数: 0
摘要
植物碳(C)浓度是估算碳储存和养分利用的基本特征。然而,人们对不同树木组织和不同物种之间碳浓度的变化机制仍然知之甚少。在这项研究中,我们探讨了 32 个树种 216 个个体的 9 种组织中 C 浓度的变化和决定因素,尤其关注了木材多孔性(即无孔木材、扩散多孔木材和环孔木材)的影响。在三种多孔类型中,组织间的碳浓度模式各不相同;与不活跃的木材相比,代谢活跃的组织(叶片和细根,但环孔树种的叶片除外)通常具有较高的碳含量。组织碳浓度之间的相互关系很差,这表明有必要测量组织和特定碳浓度。几乎所有组织的碳浓度一般都是从无孔到扩散孔再到环孔的递减过程。组织碳通常与组织(叶片和木材)密度和树木大小呈正相关,而与生长速度呈负相关,这取决于木材的多孔性。我们的研究结果凸显了木材孔隙度类型对温带树种间组织 C 变化的中介作用。组织间的变化比物种间的变化更重要。这些发现为温带森林物种的组织碳浓度变化提供了启示。
Variations and determinants of tissue carbon concentration of 32 sympatric temperate tree species
Plant carbon (C) concentration is a fundamental trait for estimating C storage and nutrient utilization. However, the mechanisms of C concentration variations among different tree tissues and across species remains poorly understood. In this study, we explored the variations and determinants of C concentration of nine tissues from 216 individuals of 32 tree species, with particular attention on the effect of wood porosity (i.e., non-porous wood, diffuse-porous wood, and ring-porous wood). The inter-tissue pattern of C concentration diverged across the three porosity types; metabolically active tissues (foliage and fine roots, except for the foliage of ring-porous species) generally had higher C levels compared with inactive wood. The poor inter-correlations between tissue C concentrations indicated a necessity of measuring tissue- and specific-C concentrations. Carbon concentration for almost all tissues generally decreased from non-porous, to diffuse-porous and to ring-porous. Tissue C was often positively correlated with tissue (foliage and wood) density and tree size, while negatively correlated with growth rate, depending on wood porosity. Our results highlight the mediating effect of type of wood porosity on the variation in tissue C among temperate species. The variations among tissues were more important than that among species. These findings provided insights on tissue C concentration variability of temperate forest species.
期刊介绍:
The Journal of Forestry Research (JFR), founded in 1990, is a peer-reviewed quarterly journal in English. JFR has rapidly emerged as an international journal published by Northeast Forestry University and Ecological Society of China in collaboration with Springer Verlag. The journal publishes scientific articles related to forestry for a broad range of international scientists, forest managers and practitioners.The scope of the journal covers the following five thematic categories and 20 subjects:
Basic Science of Forestry,
Forest biometrics,
Forest soils,
Forest hydrology,
Tree physiology,
Forest biomass, carbon, and bioenergy,
Forest biotechnology and molecular biology,
Forest Ecology,
Forest ecology,
Forest ecological services,
Restoration ecology,
Forest adaptation to climate change,
Wildlife ecology and management,
Silviculture and Forest Management,
Forest genetics and tree breeding,
Silviculture,
Forest RS, GIS, and modeling,
Forest management,
Forest Protection,
Forest entomology and pathology,
Forest fire,
Forest resources conservation,
Forest health monitoring and assessment,
Wood Science and Technology,
Wood Science and Technology.