Management impacts on the dissolved organic carbon release from deadwood, ground vegetation and the forest floor in a temperate Oak woodland.
Management impacts on the dissolved organic carbon release from deadwood, ground vegetation and the forest floor in a temperate Oak woodland.
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管理对温带橡树林中枯木、地面植被和森林地面溶解有机碳释放的影响。
DOI：
10.1016/j.scitotenv.2021.150399
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hollands C
中科院分区：
文献类型：
--
作者：
Hollands C
森林地面通常被认为是森林土壤中溶解有机碳（DOC）最重要的来源，但人们对不同森林地面层、下层植被和枯木的相对贡献知之甚少。本研究确定了枯木、地面植被、凋落叶、发酵层和表层矿质土（Ah层）等森林材料的碳储量和潜在DOC产量，并进一步评估了管理的影响。我们的研究基于一个温带落叶林地的长期监测地块，其中一组地块通过疏林、下层灌丛和清除枯木进行积极管理，另一组地块在23年内没有进行管理。我们分析了长期数据和森林材料的空间调查，以估计这些不同库释放的DOC的相对碳储量、浓度和通量。长期土壤水分监测显示，在6年的时间里，未管理的地块（43.8 mg L−1）和管理的地块（18.4 mg L−1）在10 cm深度的中位数DOC浓度存在很大差异，未管理地块的中位数DOC浓度高出两倍以上。在我们的空间调查中，未管理场地释放的DOC累积通量明显大于管理场地，分别为295.5和230.3 g m−2。虽然枯枝和凋落叶单位质量释放的DOC量最大，但当考虑材料体积时，凋落叶对DOC通量的贡献最大，枯枝贡献最小。同样，不同森林材料在不同立地的碳储量也存在显著差异。管理场地植被和发酵层的碳含量高于未管理场地，而枯木和Ah层则相反。这些结果表明，管理影响了不同森林材料之间碳储量和DOC释放的分配。
The forest floor is often considered the most important source of dissolved organic carbon (DOC) in forest soils, yet little is known about the relative contribution from different forest floor layers, understorey vegetation and deadwood. Here, we determine the carbon stocks and potential DOC production from forest materials: deadwood, ground vegetation, leaf litter, the fermentation layer and top mineral soil (Ah horizon), and further assess the impact of management. Our research is based on long-term monitoring plots in a temperate deciduous woodland, with one set of plots actively managed by thinning, understorey scrub and deadwood removal, and another set that were not managed in 23 years. We examined long-term data and a spatial survey of forest materials to estimate the relative carbon stocks and concentrations and fluxes of DOC released from these different pools. Long-term soil water monitoring revealed a large difference in median DOC concentrations between the unmanaged (43.8 mg L−1) and managed (18.4 mg L−1) sets of plots at 10 cm depth over six years, with the median DOC concentration over twice as high in the unmanaged plots. In our spatial survey, a significantly larger cumulative flux of DOC was released from the unmanaged than the managed site, with 295.5 and 230.3 g m−2, respectively. Whilst deadwood and leaf litter released the greatest amount of DOC per unit mass, when volume of the material was considered, leaf litter contributed most to DOC flux, with deadwood contributing least. Likewise, there were significant differences in the carbon stocks held by different forest materials that were dependent on site. Vegetation and the fermentation layer held more carbon in the managed site than unmanaged, whilst the opposite occurred in deadwood and the Ah horizon. These findings indicate that management affects the allocation of carbon stored and DOC released between different forest materials.
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DOI：
10.1016/b978-0-08-098222-9.00015-7
发表时间：
2013
期刊：
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影响因子：
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