废弃泥炭开采地表土因地面沉降和侵蚀造成的碳损失

IF 3.2 2区 环境科学与生态学 Q2 ENVIRONMENTAL STUDIES
Land Pub Date : 2023-12-12 DOI:10.3390/land12122153
R. Meļņiks, A. Bārdule, A. Butlers, Jordane Champion, S. Kaleja, I. Skranda, G. Petaja, A. Lazdiņš
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引用次数: 0

摘要

泥炭侵蚀对土壤肥力、农业生产力和气候变化动态有重大影响。在这一过程中,富含有机物和碳(C)的表土被带走,并可能被带到很远的地方,造成碳的净损失。此外,泥炭还会发生氧化,导致碳的进一步流失。在我们的研究中,我们评估了两个研究地点的 11 块泥炭采掘场的碳损失情况,这些采掘场已废弃 15 年以上,被不同密度的植被覆盖。我们使用了高分辨率机载激光扫描点云和 9 年内定期获取的多光谱航空图像,并对表土层进行了化学分析。在研究中,我们发现泥炭沉降、碳损失和植被密度(NDVI 值)之间存在很强的相关性。NDVI 也决定了海拔数据的大部分不确定性。我们还发现,侵蚀和泥炭沉降都是泥炭开采地碳损失的重要来源。在一个监测时间超过 9 年的地点,我们估计的地面高程变化范围为 0.1 厘米/年-1 至 0.58 厘米/年-1;但在另一个监测时间为 4 年的地点,其数值范围为 2.14 厘米/年-1 至 5.72 厘米/年-1。因此,年平均碳损失量从 0.06 到 0.22 千克碳 m-2 y-1 不等,年平均碳损失量从 1.21 到 3.57 千克碳 m-2 y-1 不等。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carbon Losses from Topsoil in Abandoned Peat Extraction Sites Due to Ground Subsidence and Erosion
Peat erosion has a significant impact on soil fertility, agricultural productivity, and climate change dynamics. Through this process, the topsoil rich in organic matter and carbon (C) is removed and can travel long distances, causing a net C loss. Additionally, peat undergoes oxidation, resulting in further C loss. In our study, we evaluated C losses from 11 peat extraction fields in two study sites, abandoned for more than 15 years and overgrown by vegetation of different densities. We used high-resolution airborne laser scanning point clouds and multispectral aerial images acquired periodically within a 9-year period, as well as chemical analyses of the topsoil layer. In our study, we found a strong correlation between peat subsidence, C loss, and the vegetation density (NDVI value). NDVI also determines most of the uncertainty in elevation data. We found also that both erosion and peat subsidence are significant sources of C losses from peat extraction sites. At a site monitored for over 9 years, our estimated ground elevation changes ranged from 0.1 cm y−1 to 0.58 cm y−1; however, at a different site monitored over a 4-year period, the values ranged from 2.14 cm y−1 to 5.72 cm y−1. Accordingly, the mean annual C losses varied from 0.06 to 0.22 kg C m−2 y−1 and from 1.21 to 3.57 kg C m−2 y−1.
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来源期刊
Land
Land ENVIRONMENTAL STUDIES-Nature and Landscape Conservation
CiteScore
4.90
自引率
23.10%
发文量
1927
期刊介绍: Land is an international and cross-disciplinary, peer-reviewed, open access journal of land system science, landscape, soil–sediment–water systems, urban study, land–climate interactions, water–energy–land–food (WELF) nexus, biodiversity research and health nexus, land modelling and data processing, ecosystem services, and multifunctionality and sustainability etc., published monthly online by MDPI. The International Association for Landscape Ecology (IALE), European Land-use Institute (ELI), and Landscape Institute (LI) are affiliated with Land, and their members receive a discount on the article processing charge.
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