Charred plant fragment?aluminium complexes in buried humic horizons of a cumulative volcanic soil profile: Formation, accumulation and potential role
Charred plant fragment?aluminium complexes in buried humic horizons of a cumulative volcanic soil profile: Formation, accumulation and potential role
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烧焦的植物碎片？累积火山土壤剖面埋藏腐殖质层中的铝复合物：形成、积累和潜在作用
DOI：
10.1111/ejss.13171
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发表时间：
2021
影响因子：
4.2
通讯作者：
Inoue Yudzuru
中科院分区：
文献类型：
--
作者：
Shindo Haruo;Inoue Yudzuru
本研究的目的是调查的形成，积累和潜在的作用，烧焦的植物片段（CPF）铝（Al）复合物在几个埋A（Ab）层的累积火山土壤剖面，集中在CPF，活性铝成分和土壤年龄。从4个埋藏的腐殖层（2A-5A，从7.3 cal ka BP到AD 1471）采集了19个土壤样品，并对其CPF-碳（C），土壤有机碳（SOC），酸草酸盐提取的Al（Alox），焦磷酸盐提取的Al（Alpy，Al-腐殖质复合物）和短程有序Al矿物（Alox-Alpy）进行了定量。CPF-C含量（高达15.8 g kg-1）与SOC含量（高达117 g kg-1）的比例范围为2.3%至15.1%（平均8.4%）。活性铝组分的含量（6.71-77.1 g kg−1）增加：Alpy< Alox− Alpy< Alox。未发现CPF-C、SOC和活性铝组分的累积水平随年龄变化的一致趋势。而AlPy与CPF-C和SOC含量呈显著正相关（p< 0.001），表明有机质在腐殖层中的积累和稳定与有机铝复合物（包括CPF-Al复合物）的形成同时进行。Alox-Alpy与Alpy、CPF-C、SOC含量呈显著负相关（p< 0.01）。根据这些相关性，假设有机组分（包括CPF）与Al的络合与短程有序Al矿物（包括水铝英石和伊毛戈兰）的合成竞争，而与土壤年龄和气候条件无关，范围超过6000年。本文首次描述了在CPFs存在下的这种竞争关系。重点讨论了腐殖层中植物残体-铝复合物的意义。有机组分的积累水平随年龄的变化没有一致的趋势。有机质的积累与复合物的形成是同时进行的。复合物的形成是竞争性的。（>6000年）与铝矿物的合成。
The objective of the present study was to investigate the formation, accumulation and potential role of charred plant fragment (CPF)–aluminium (Al) complexes in several buried A (Ab) horizons of a cumulative volcanic soil profile, focusing on CPFs, active Al components and soil age. Nineteen soil samples were collected from four buried humic horizons (2A–5A, from 7.3 cal ka BP to AD 1471), and their CPF–carbon (C), soil organic C (SOC), acid oxalate‐extractable Al (Alox), pyrophosphate‐extractable Al (Alpy, Al–humus complexes) and short‐range ordered Al minerals (Alox− Alpy) were quantified. The proportion of CPF–C content (up to 15.8 g kg−1) to SOC content (up to 117 g kg−1) ranged from 2.3% to 15.1% (8.4% on average). The contents of active Al components (6.71–77.1 g kg−1) increased: Alpy< Alox− Alpy< Alox. No consistent trends with age were found for the accumulation levels of CPF–C, SOC and active Al components. However, significant positive correlations (p< 0.001) were found between the Alpyand CPF–C and SOC contents, suggesting that the accumulation and stabilisation of soil organic matter in these humic layers proceeded simultaneously with the formation of organo–Al complexes, including CPF–Al complexes. On the other hand, significant negative correlations (p< 0.01) were obtained between the Alox− Alpyand Alpy, CPF–C or SOC contents. From these correlations, it was assumed that the complexation of organic constituents, including CPFs, with Al competed with the synthesis of short‐range ordered Al minerals (including allophane and imogolite), irrespective of soil age and climatic conditions with the range of more than 6000 years. This competitive relationship in the presence of CPFs was first described in the current study.HighlightsSignificance of charred plant fragment–aluminium complexes in humic horizons was discussed.There were no consistent trends with age for the accumulation levels of organic constituents.The accumulation of organic matter proceeded simultaneously with the formation of the complexes.The formation of the complexes competed (>6000 years) with the synthesis of aluminium minerals.