Iron-bound organic carbon and their determinants in peatlands of China
Iron-bound organic carbon and their determinants in peatlands of China
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中国泥炭地铁结合有机碳及其决定因素
DOI：
10.1016/j.geoderma.2021.114974
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发表时间：
2021-06
期刊：
影响因子：
6.1
通讯作者：
Xinwei Liu
中科院分区：
文献类型：
--
作者：
Huai Chen;Jianliang Liu;Xinya Huang;Xinwei Liu
氧化铁矿物和有机碳(OC)浓度之间有很强的相关性。然而，人们对氧化铁矿物在泥炭地有机碳保存中的作用知之甚少。在本研究中，我们采集了中国中西部10个泥炭地的土壤样品，全面调查了铁氧化物结合有机碳(Fe-Bound OC，Fe-Bound OC)的浓度、特征和空间变异性，确定了气候因素和土壤理化性质对有机铁与铁氧化物相关性的影响。结果表明，土壤铁结合态有机碳含量在3.91~18.79 mg/kg−-1之间，平均占土壤有机碳的3.42g±71.32%。泥炭地有机碳/铁的摩尔比在2.17~12.18之间，表明共沉淀是影响泥炭地有机碳与活性铁氧化物结合的主要机制。δ~(13)C同位素分析表明，泥炭地中铁结合有机碳在~(13)C中相对富集。铁矿物来源、当地植被和地下水位是造成10个地点铁结合有机碳浓度差异的原因。相关分析结果表明，总有机碳是决定土壤铁结合态有机碳含量的主要因素(r=0.549，p<；P<0.01)，其结合机制受总有机碳和活性铁含量的共同调控。铁结合有机碳与总有机碳的比例(FFe结合有机碳)与活性铁呈正相关(r=0.0.457，p<；P<0.0 5)，说明与铁矿物结合在有机碳积累中的重要性受泥炭地活性铁浓度的调节。这项研究突出了泥炭地铁结合有机碳的数量特征和空间变异性，为评估和管理泥炭地生态系统的碳循环提供了重要信息。
There is a strong correlation between iron oxide mineral and organic carbon (OC) concentrations. However, the role of iron oxide minerals in the preservation of OC in peatlands is poorly understood. In this study, we collected soil samples from 10 peatlands in central and west China to comprehensively investigate the concentration, characteristics, and spatial variability of iron oxide-bound OC (Fe-bound OC) concentrations and determine the impact of climatic factors and soil physicochemical properties on the correlation between OC and iron oxides. Our results showed that the concentration of Fe-bound OC ranged from 3.91 to 18.79 g kg−1. On average, Fe-bound OC accounted for 3.42 ± 1.32% of soil OC. The molar ratio of OC: Fe ranged from 2.17 to 12.18, indicating that coprecipitation was the dominant mechanism affecting the binding of OC to reactive iron oxides in peatlands. δ13C isotope analyses revealed that Fe-bound OC was relatively enriched in13C in peatlands. Iron mineral sources, local vegetation, and the water table were responsible for differences in the concentration of Fe-bound OC identified among the 10 sites. Correlation analysis results indicated that total organic carbon (TOC) was the main determinant factor for the concentration of Fe-bound OC (r = 0.549,p< 0.01), and the binding mechanism was jointly regulated by TOC and reactive Fe content. The proportion of Fe-bound OC to TOC (fFe-bound OC) was positively correlated with the reactive Fe (r = 0.457,p< 0.05), indicating that the importance of binding with iron minerals in OC accumulation is regulated by the concentration of reactive Fe in peatlands. This study highlights the quantitative characteristics and spatial variability of Fe-bound OC in peatlands, providing important information for assessing and managing the carbon cycle in peatland ecosystems.
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影响因子：
4.6
作者：
Adhikari D;Yang Y
通讯作者：
Yang Y
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DOI：
10.1029/2018jg004649
发表时间：
2018
期刊：
Journal of Geophysical Research: Biogeosciences
影响因子：
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作者：
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Zhigang Yu
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1.6
作者：
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影响因子：
3
作者：
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通讯作者：
Skjemstad, JO
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影响因子：
16.6
作者：
Wang Y;Wang H;He JS;Feng X
通讯作者：
Feng X