林业排水对芬兰北方泥炭地表层泥炭组成和物理特性的影响

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-02-08 DOI:10.1007/s10533-023-01115-x
Jukka Turunen, Jani Anttila, Anna M. Laine, Juha Ovaskainen, Matti Laatikainen, Jukka Alm, Tuula Larmola
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引用次数: 0

摘要

摘要 在减缓气候变化的过程中,对排水泥炭地的管理可能会带来风险,也可能是一种解决方案,因此需要对林业排水泥炭地的现状、退化过程的程度以及碳(C)损失指标进行评估。我们利用芬兰各地不同肥力等级泥炭地的大型数据集(1977 年至 2017 年间收集的 778 个剖面、891 个泥炭样本),研究了未排水泥炭地和林业排水泥炭地的地表泥炭剖面在 C:N、von Post 和干容重方面是否存在差异。我们还从 16 个未排水泥炭剖面和 30 个排水泥炭剖面的子样本中进一步分析了元素比率(C:N:H 化学计量)作为泥炭退化指标的实用性。这些排水地点的子样本测量了二氧化碳(CO2)和甲烷(CH4)通量,使我们能够将泥炭元素比与每年的碳气体流出量联系起来。我们发现,元素比率 H:C、O:C 和 C:N 以及不饱和程度(结合 C、N、H 的变化)具有广泛的有效性:它们既反映了泥炭植物来源的差异,也反映了泥炭的潜在分解途径(通过溶解有机碳和碳气体流失和/或主要作为二氧化碳的气体流失)。在化学计量指数中,泥炭的 H:C 比率似乎是排水后降解的最佳代表,它不仅表明泥炭的长期降解,还解释了年二氧化碳排放量变化的 48%。O:C 比率与年甲烷通量呈正相关,这可能是因为泥炭中的高 O:C 反映了甲烷生成所需的易降解基质的可用性。C:N 比率的差异表明以泥炭藓为主的泥炭地有明显的分解过程,而以薹草为主的泥炭地则没有。不饱和程度显示了作为排水引起的地下水位下降和排水后泥炭基质质量变化的综合替代物的潜力。
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Impacts of forestry drainage on surface peat stoichiometry and physical properties in boreal peatlands in Finland

Management of drained peatlands may pose a risk or a solution on the way towards climate change mitigation, which creates a need to evaluate the current state of forestry-drained peatlands, the magnitude of degradation processes and indicators for carbon (C) loss. Using a large dataset (778 profiles, 891 peat samples, collected between 1977 and 2017) from peatlands having different fertility classes across Finland, we investigate whether the surface peat profiles of undrained and forestry-drained peatlands differ in C:N, von Post and dry bulk density. The utility of element ratios (C:N:H stoichiometry) as site indicators for degradation were further analyzed from a subsample of 16 undrained and 30 drained peat profiles. This subsample of drained sites had carbon dioxide (CO2) and methane (CH4) fluxes measured allowing us to link peat element ratios to annual C gas effluxes. Element ratios H:C, O:C and C:N and degree of unsaturation (combining C, N, H changes) were found widely valid: they captured both differences in the botanical origin of peat as well as its potential decomposition pathway (C lost via a combination of dissolved organic C and C gas loss and/or the gaseous loss predominantly as CO2). Of the stoichiometric indexes, peat H:C ratio seemed to be the best proxy for degradation following drainage, it indicated not only long-term degradation but also explained 48% of the variation in annual CO2 emission. The O:C ratio positively correlated with annual CH4 flux, presumably because high O:C in peat reflected the availability of easily degradable substrate for methanogenesis. The differences in C:N ratio indicated notable decomposition processes for Sphagnum-dominated peatlands but not in Carex-dominated peatlands. Degree of unsaturation showed potential for an integrative proxy for drainage-induced lowering water table and post-drainage changes in peat substrate quality.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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