Soil nitrogen and phosphorus regulate decomposition of organic nitrogen compounds in the rothamsted experiment

文献类型： 外文期刊

第一作者： Tang, Sheng

作者： Tang, Sheng;Pan, Wankun;Ma, Qingxu;Wu, Lianghuan;Tang, Sheng;Pan, Wankun;Ma, Qingxu;Wu, Lianghuan;Tang, Sheng;Pan, Wankun;Ma, Qingxu;Marsden, Karina A.;Chadwick, David R.;Jones, Davey L.;Zhou, Jingjie;Yang, Xiangde;Wanek, Wolfgang;Kuzyakov, Yakov;Kuzyakov, Yakov;Kuzyakov, Yakov;Gregory, Andrew S.;Jones, Davey L.

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关键词： Long-term experiment; Nitrogen fertilisation; Phosphorus fertilisation; Soil organic nitrogen decomposition; Isotope labelling

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：10.3； 五年影响因子：11.5 ）

ISSN： 0038-0717

年卷期： 2024 年 196 卷

页码：

收录情况： SCI

摘要： The effects of long-term N and P fertilisation on soil organic nitrogen (SON) turnover are unclear. We sampled soils fertilised by N and/or P since 1843 at Rothamsted Research to investigate the effects of long-term N and P fertilisation on high- or low-molecular-weight SON decomposition and gross N mineralisation. Short-term assays with added 14C-labelled proteins, peptides, and amino acids and gross organic N mineralisation were measured, and the microbial communities and functions were also assessed in parallel. Long-term N fertilisation increased the contents of soil extractable organic N and peptides but decreased organic N-hydrolysing enzyme activities (Nacetyl-beta-D-glucosaminidase and leucine aminopeptidase). Fertilisation with P and N accelerated and reduced the decomposition of C-14-labelled organic N compounds, respectively. The decomposition of peptides and amino acids, as labile SON components, was mainly regulated by soil P content because microbial biomass and activity were more sensitive to P fertilisation than to N fertilisation. Gross NH4+(NO3-)-N-/ production and consumption were accelerated by 41%-60% under N fertilisation but remained unchanged under P fertilisation compared to the unfertilised treatment. Metagenomic sequencing showed that N fertilisation increased microbial diversity and enriched functional genes associated with organic N decomposition, compared to the unfertilised treatment. P fertilisation had no effect on the abundance of these functional genes. In agricultural practices, it is essential to comprehensively consider the interaction between N and P fertilisation to optimise the cycling and utilisation of SON.

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