Addition of base cations increases microbial carbon use efficiency and biomass in acidic soils

Addition of base cations increases microbial carbon use efficiency and biomass in acidic soils
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添加碱性阳离子可提高酸性土壤中微生物的碳利用效率和生物量

DOI:
10.1016/j.soilbio.2021.108392
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发表时间:
2021
影响因子:
9.7
通讯作者:
Horn E
Horn E
中科院分区:
农林科学1区
文献类型:
--
作者:
Horn E

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碱性阳离子在酸性土壤中的淋溶可导致钙(Ca 2+)和镁(Mg 2+)缺乏,这对微生物细胞功能是重要的。我们的目的是确定是否微生物碳利用效率(CUE)和微生物生物量碳(MBC)是有限的,在酸性土壤中,由于缺乏碱性阳离子。用~(14)C放射性同位素示踪法测定了用去离子水(对照)或300 mM CaCl_2 + 300 mM MgCl_2(+碱阳离子)溶液处理的一系列农业土壤(n= 970; pHCa 3.4 -7.9)中的微生物CUE。我们的研究结果表明,在pHCa< 4.7时,盐基阳离子的加入显著增加了微生物的CUE(高达20%);这与交换性酸度的急剧增加相一致。当添加植物残体时,在无石灰土壤(pHCa4.6)中添加碱性阳离子显著增加MBC,从494 mg C kg− 1增加到769 mg C kg− 1,但在石灰土壤(pHCa6.2)中没有增加。我们的研究结果表明,在高酸性土壤中添加阳离子可以增加微生物的生长,从而有助于这些农业土壤的碳封存。
The leaching of base cations in acidic soils can result in calcium (Ca2+) and magnesium (Mg2+) deficiencies, which are important for microbial cell function. We aimed to determine if microbial carbon use efficiency (CUE) and microbial biomass carbon (MBC) were limited in acidic soils due to a lack of base cations. Microbial CUE across a range of agricultural soils (n= 970; pHCa3.4–7.9) treated with either deionised H2O (control) or a solution of 300 mM CaCl2+ 300 mM MgCl2(+Base cations) was determined using a14C radioisotope tracer approach. Our results showed that the addition of base cations significantly increased microbial CUE (by up to 20%) at pHCa< 4.7; which coincided with a steep increase in exchangeable acidity. Base cation addition significantly increased MBC in nil-limed soils (pHCa4.6) from 494 mg C kg−1to 769 mg C kg−1when plant residue was added, but not in limed soils (pHCa6.2). Our findings indicate that the addition of base cations to highly acidic soils can increase microbial growth, thus aiding with carbon sequestration in these agricultural soils.
DOI: 10.1146/annurev-genet-051313-051025
发表时间: 2013
影响因子: 11.1
作者:
Groisman EA;Hollands K;Kriner MA;Lee EJ;Park SY;Pontes MH
通讯作者: Pontes MH
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DOI: --
发表时间: 1949
期刊: Journal of General Microbiology
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通讯作者: M. Webb
DOI: 10.2136/sssaj2011.0128
发表时间: 2012-01-01
影响因子: 2.9
作者:
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通讯作者: dos Santos, Josiane Buerkner
DOI: --
发表时间: 1948
期刊:
影响因子: --
作者:
M. Webb
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