A compartmentation approach to deconstruct ecosystem carbon fluxes of a Moso bamboo forest in subtropical China

IF 3.8 1区农林科学 Q1 FORESTRY

Forest Ecosystems Pub Date : 2024-12-06 DOI:10.1016/j.fecs.2024.100286

Jianhua Lv , Quan Li , Tingting Cao , Man Shi , Changhui Peng , Lei Deng , Xinzhang Song

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Abstract

Moso bamboo (Phyllostachys edulis) forests are a vital resource in subtropical China, known for their high carbon (C) sequestration capacity. However, the dynamic processes of C fluxes within each component (canopy, culm, and soil) and their individual contributions, particularly during on- and off-years, remain unclear. A 2-year field experiment was conducted to investigate the dynamics of C fluxes from the canopy, culm, and soil (partitioned into heterotrophic, rhizome, and stump respiration) and their contributions to net ecosystem productivity (NEP) in a representative Moso bamboo forest in the subtropical region of China. The average annual NEP of the Moso bamboo forest was 7.31 ± 2.76 t C·ha⁻¹. Specifically, the canopy's annual net C uptake was 17.30 ± 3.23 t C·ha⁻¹, accounting for 237% of NEP. In contrast, C emissions from heterotrophs, culms, rhizomes, and stumps were 5.37 ± 1.20, 2.18 ± 1.05, 1.29 ± 0.04, and 1.15 ± 0.33 t C·ha⁻¹, accounting for −73%, −30%, −18%, and −16% of NEP, respectively. The NEP, net cumulative C uptake in the canopy, and C emissions from the respiration of heterotrophs and stumps were all significantly higher during on-years when compared to off-years, whereas C emissions from bamboo culms displayed opposite trends. These findings offer a new approach for quantifying the C budgets of Moso bamboo forests and provide valuable insights into the C cycling processes in forest ecosystems.

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亚热带毛梭竹林生态系统碳通量的区隔分析

毛竹（Phyllostachys edulis）森林以其高碳(C)固存能力而闻名，是中国亚热带地区的重要资源。然而，各组分（冠层、秆层和土壤）内碳通量的动态过程及其各自的贡献，特别是在年际和非年际，仍不清楚。通过2年的野外试验，研究了亚热带毛梭竹林林冠、秆和土壤（异养呼吸、根茎呼吸和树桩呼吸）碳通量的动态及其对净生态系统生产力（NEP）的贡献。毛梭竹林年平均NEP为7.31±2.76 t C·ha−1。林冠年净碳吸收量为17.30±3.23 t C·ha−1，占NEP的237%。异养体、茎、根茎和树桩的碳排放量分别为5.37±1.20、2.18±1.05、1.29±0.04和1.15±0.33 t C·ha - 1，分别占NEP的−73%、−30%、−18%和−16%。林冠净累积碳吸收量、异养生物和树桩呼吸碳排放均显著高于非年，而竹竿碳排放呈相反趋势。这些发现为量化毛索竹林的碳收支提供了一种新的方法，并为森林生态系统的碳循环过程提供了有价值的见解。

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来源期刊

Forest Ecosystems Environmental Science-Nature and Landscape Conservation

CiteScore

7.10

自引率

4.90%

发文量

1115

审稿时长

22 days

期刊介绍： Forest Ecosystems is an open access, peer-reviewed journal publishing scientific communications from any discipline that can provide interesting contributions about the structure and dynamics of "natural" and "domesticated" forest ecosystems, and their services to people. The journal welcomes innovative science as well as application oriented work that will enhance understanding of woody plant communities. Very specific studies are welcome if they are part of a thematic series that provides some holistic perspective that is of general interest.