不同类型水稻土可溶性有机氮及其组分的剖面分布
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S154

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国家自然科学基金面上项目(41671490)、福建农林大学科技创新项目(CXZX2017217)和福建农林大学优秀博士学位论文资助基金(324-1122yb080)资助。


Profile Distribution of Soluble Organic Nitrogen and Its Components in Different Paddy Soils
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National Natural Science Foundation of China (41671490) and the Science and Technology Innovation Fund Project of Fujian Agriculture and Forestry University (KF2105074, CXZX2017217)

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    摘要:

    为揭示可溶性有机氮(soluble organic nitrogen,SON)在土壤剖面的分布状况,选取中亚热带地区发育于相同母质的黄泥田、灰黄泥田和灰泥田3种不同类型水稻土为对象,研究不同类型水稻土剖面中SON含量、组分及主控因子。结果表明,不同类型水稻土SON、游离氨基酸氮(FAA-N)、酰胺氮(AN-N)和可溶性蛋白氮(SP-N)含量具有明显的剖面分异,均表现为0 ~ 20 cm土层>20 ~ 40 cm土层>40 ~ 60 cm土层。不同类型水稻土SON及各组分含量差异主要表现在0 ~ 20 cm土层,均表现为灰泥田>灰黄泥田>黄泥田,灰泥田SON、FAA-N、AN-N和SP-N含量分别高于灰黄泥田50.5%、41.7%、44.8% 和2.1%,高于黄泥田196.5%、200.9%、180.4% 和76.5%。0 ~ 20 cm土层3种不同类型水稻土FAA-N和AN-N分别占SON的54.4% ~ 58.7% 和45.5% ~ 48.1%,而底层(40 ~ 60 cm)FAA-N和AN-N分别占SON的33.1% ~ 55.7% 和50.3% ~ 52.8%,说明FAA-N和AN-N具有向下累积的趋势,且在土壤剖面中对SON的贡献大于SP-N。中性氨基酸尤其是肌氨酸是底层FAA-N的主要组分。灰色关联分析表明有机质、蛋白酶、脲酶和总孔隙度与不同类型水稻土SON及组分垂直分布密切相关,对SON、FAA-N、AN-N和SP-N含量变化的总贡献度分别为95.2%、92.1%、98.3% 和90.9%。因此,SON及组分在土壤剖面中的垂直分布与土壤类型和土层深度密切相关,且受土壤有机质、酶活和总孔隙度的影响。

    Abstract:

    In order to reveal the distribution of soluble organic nitrogen (SON) in soil profile, three types of paddy soils (yellow, grey and yellow podzolic paddy soils) with the same parent material were selected to study the content, composition and main influencing factors of SON in paddy soil profiles. The results showed that the contents of SON, free amino acid nitrogen (FAA-N), amide nitrogen (AN-N) and soluble protein nitrogen (SP-N) had significant differences in different paddy soil profiles, and all were in an order of 0-20 cm > 20-40 cm > 40-60 cm. The contents of SON and its components in different paddy soils were mainly manifested in the 0-20 cm, in which all was in an order of grey paddy soil > yellow podzolic paddy soil > yellow paddy soil. The contents of SON, FAA-N, AN-N and SP-N in grey paddy soil were 50.5%, 41.7%, 44.8% and 2.1% higher than those of yellow podzolic paddy soil, 196.5%, 200.9%, 180.4% and 76.5% higher than those of yellow paddy soil. The contents of FAA-N and AN-N of the three paddy soils in 0-20 cm accounted for 55.4%-58.7% and 45.5%-48.1% of SON, respectively, while the contents of FAA-N and AN-N in 40-60 cm accounted for 33.1%-55.7% and 50.3%-52.8% of SON, respectively. These results indicated that FAA-N and AN-N had a downward accumulation trend, and contribute more to SON than SP-N in soil profile. Neutral amino acids, especially sarcosine, were the main components of FAA-N in 40-60 cm. Grey correlation analysis showed that organic matter, protease, urease and total porosity were closely related to the vertical distribution of SON and components in different paddy soils, and their contribution to SON, FAA-N, AN-N and SP-N were 95.2%, 92.1%, 98.3% and 90.9%, respectively. Therefore, the vertical distribution of SON and its components in soil profile is closely related to soil type and depth, and is affected by soil organic matter, enzyme activities and total porosity.

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杨静,张毅,鲍清涛,杨文浩,周碧青,张黎明,邢世和.不同类型水稻土可溶性有机氮及其组分的剖面分布[J].土壤,2022,54(4):691-699. YANG Jing, ZHANG Yi, BAO Qingtao, YANG Wenhao, ZHOU Biqing, ZHANG Liming, XING Shihe. Profile Distribution of Soluble Organic Nitrogen and Its Components in Different Paddy Soils[J]. Soils,2022,54(4):691-699

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  • 收稿日期:2021-07-09
  • 最后修改日期:2022-01-01
  • 录用日期:2022-01-05
  • 在线发布日期: 2022-08-26
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