Effect of active aluminum on soil phosphorus forms in a forested watershed in Akita, Japan
Effect of active aluminum on soil phosphorus forms in a forested watershed in Akita, Japan
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DOI：
10.1016/j.geoderma.2022.115800
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发表时间：
2022-06
期刊：
影响因子：
6.1
通讯作者：
N. Hosokawa;Y. Ozawa;A. Hayakawa;Y. Ishikawa;Tadashi Takahashi
中科院分区：
文献类型：
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作者：
N. Hosokawa;Y. Ozawa;A. Hayakawa;Y. Ishikawa;Tadashi Takahashi
火山灰在日本的大面积地区降落，并通过丰富的活性铝（Al）供应形成独特的土壤物理和化学性质。然而，两种类型的活性铝，特别是铝-腐殖质复合物和无定形矿物，对土壤磷（P）形态的影响还不清楚。我们调查了海拔80 - 451米的火山岩和沉积岩地区森林土壤中受火山物质影响的土壤磷组分。在日本的一个分水岭，从29个日本雪松林中采集了坡脚0 - 10和10 - 20 cm土壤样品。土壤样品依次提取，以获得操作定义的P组分：钙（Ca）-P，铝-P，铁（Fe）-P。土壤样品也被提取，以获得草酸可提取的硅（Sio）和铝（Alo），焦磷酸可提取的铝（Alp）和铁（Fep）。无论在哪个采样点，土壤磷素的主要形态均为Fe-P，其次为Al-P和Ca-P，各形态磷素与坡度均呈正相关。火成岩区0-20 cm深度的全磷含量之和显著高于沉积岩区。Al-P与代表无定形矿物的Sio呈显著正相关，与代表铝-腐殖质复合体的Alp呈显著负相关。结果表明，无定形矿物增加了铝结合态磷，而铝-腐殖质复合体则减少了铝结合态磷。由于Al和Fe存在金属-腐殖酸复合物，这些结果表明，Al-腐殖酸复合物增加腐殖质相关的P。不同的影响，这两种活性形式的铝可能导致不同的磷动态在森林生态系统中。
Volcanic ash has fallen over a broad area in Japan and contributed to the formation of unique soil physical and chemical properties through the abundant supply of active aluminum (Al). However, the effect of two types of active Al, specifically Al-humus complexes and amorphous minerals, on soil phosphorous (P) forms remains unclear. We investigated soil P fractions in forest soil influenced by volcanic materials in igneous and sedimentary rock areas across an altitude of 80–451 m above sea level. Samples from the top 0–10 and 10–20 cm of the soil at the foot of a slope were collected from 29 Japanese cedar forests in a watershed in Japan. Soil samples were sequentially extracted to obtain operationally defined P fractions: calcium (Ca)-P, Al-P, and iron (Fe)-P. The soil samples were also extracted to obtain oxalate extractable silicon (Sio) and Al (Alo), and pyrophosphate extractable Al (Alp) and Fe (Fep). Regardless of the sampling location, the dominant soil P form was Fe-P, followed by Al-P and Ca-P. Each soil P fraction was positively correlated with slope angle. The sum of the fractionated P in the 0–20 cm depth on the igneous rock area was significantly higher than that in the sedimentary rock area. Al-P was significantly positively correlated with Sio, which represents amorphous minerals, while Al-P was significantly negatively correlated with Alp, which represents Al-humus complexes. Thus, these results suggested that amorphous minerals increased Al-associated P, while Al-humus complexes decreased Al-associated P. In contrast, the correlation between the Fe-P and Alpor Fepwas positive. Because Alpand Feprepresent metal-humus complexes, these results suggested that Al-humus complexes increased humus related P. The different effects of the two active forms of Al may result in distinctive P dynamics in forest ecosystems.