Carbon storage in old hedgerows: The importance of below-ground biomass

IF 5.9 3区 工程技术 Q1 AGRONOMY Global Change Biology Bioenergy Pub Date : 2023-11-16 DOI:10.1111/gcbb.13112
Sophie Drexler, Eiko Thiessen, Axel Don
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Abstract

Ambitious climate change mitigation goals require novel carbon (C) sinks in agricultural systems. Thus, the establishment of new hedgerows is increasingly attracting attention as a C sequestration measure. Despite hedgerows being a traditional agroforestry system, few studies have been conducted on hedgerow C stocks. Data on below-ground biomass (BGB) in particular are limited. The aim of this study was therefore to quantify both above-ground biomass (AGB) and BGB C stocks, as well as litter and soil organic C stocks, of established hedgerow systems by destructive sampling at three sites in northern Germany. The total biomass C (TBC) stock of the sampled hedgerows was 105 ± 11 Mg ha−1 on average. An additional 11 ± 2 Mg ha−1 were found in hedgerow litter and dead roots. Coarse roots (34% of TBC), stumps (22%) and harvestable biomass (20%) were the largest biomass C pools of the hedgerows. The BGB:AGB ratio was 0.7 ± 0.1, showing the importance of BGB in old hedgerow systems. Compared with other woody systems, these old hedgerows seem to have a different biomass distribution, with more biomass allocated below-ground. About 15% of BGB C stock was stored in fine roots, whereas 85% was stored in coarse roots. The topsoil (0–30 cm) contained 85% of coarse root biomass C and 51% of fine root biomass C. Hedgerow C stock exceeded that of average German forests, and thus demonstrated their large potential for C sequestration when newly planted. This study provides detailed empirical data on C stocks in old hedgerow systems, and thus can be used to take hedgerow C sinks into account in C farming frameworks.

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老树篱中的碳储存:地下生物量的重要性
雄心勃勃的气候变化减缓目标需要农业系统中新的碳(C)汇。因此,建立新的植物篱作为碳封存措施越来越受到人们的关注。尽管植物篱是一种传统的农林复合系统,但对植物篱C储量的研究却很少。关于地下生物量(BGB)的数据尤其有限。因此,本研究的目的是通过在德国北部三个地点进行破坏性采样,量化已建立的植物篱系统的地上生物量(AGB)和BGB C储量,以及凋落物和土壤有机C储量。植被篱总生物量C (TBC)储量平均为105±11 Mg ha−1。在树篱凋落物和死根中发现了额外的11±2 Mg ha−1。粗根(占总生物量的34%)、树桩(22%)和可收获生物量(20%)是植物篱最大的生物量C库。BGB:AGB比值为0.7±0.1,说明BGB在老树篱系统中的重要性。与其他木本系统相比,这些古老的树篱似乎有不同的生物量分布,更多的生物量分配在地下。约15%的BGB C砧木储存在细根中,85%储存在粗根中。表层土壤(0 ~ 30 cm)粗根生物量C占85%,细根生物量C占51%。绿篱C储量超过德国森林平均水平,在新种植时具有较大的固碳潜力。本研究提供了关于老树篱系统中碳储量的详细实证数据,因此可用于在碳养殖框架中考虑树篱碳汇。
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来源期刊
Global Change Biology Bioenergy
Global Change Biology Bioenergy AGRONOMY-ENERGY & FUELS
CiteScore
10.30
自引率
7.10%
发文量
96
审稿时长
1.5 months
期刊介绍: GCB Bioenergy is an international journal publishing original research papers, review articles and commentaries that promote understanding of the interface between biological and environmental sciences and the production of fuels directly from plants, algae and waste. The scope of the journal extends to areas outside of biology to policy forum, socioeconomic analyses, technoeconomic analyses and systems analysis. Papers do not need a global change component for consideration for publication, it is viewed as implicit that most bioenergy will be beneficial in avoiding at least a part of the fossil fuel energy that would otherwise be used. Key areas covered by the journal: Bioenergy feedstock and bio-oil production: energy crops and algae their management,, genomics, genetic improvements, planting, harvesting, storage, transportation, integrated logistics, production modeling, composition and its modification, pests, diseases and weeds of feedstocks. Manuscripts concerning alternative energy based on biological mimicry are also encouraged (e.g. artificial photosynthesis). Biological Residues/Co-products: from agricultural production, forestry and plantations (stover, sugar, bio-plastics, etc.), algae processing industries, and municipal sources (MSW). Bioenergy and the Environment: ecosystem services, carbon mitigation, land use change, life cycle assessment, energy and greenhouse gas balances, water use, water quality, assessment of sustainability, and biodiversity issues. Bioenergy Socioeconomics: examining the economic viability or social acceptability of crops, crops systems and their processing, including genetically modified organisms [GMOs], health impacts of bioenergy systems. Bioenergy Policy: legislative developments affecting biofuels and bioenergy. Bioenergy Systems Analysis: examining biological developments in a whole systems context.
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