Organic and inorganic sulfur and nitrogen uptake by co-existing grassland plant species competing with soil microorganisms

文献类型： 外文期刊

第一作者： Ma, Qingxu

作者： Ma, Qingxu;Xu, Meng;Liu, Mengjiao;Wu, Lianghuan;Ma, Qingxu;Hill, Paul W.;Chadwick, David R.;Jones, Davey L.;Cao, Xiaochuang;Jones, Davey L.

作者机构：

关键词： Organic sulfur mineralisation; Soil organic nitrogen; Soil sulfur cycling; Intercropping; Nutrient cycling

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：8.546； 五年影响因子：9.956 ）

ISSN： 0038-0717

年卷期： 2022 年 168 卷

页码：

收录情况： SCI

摘要： Cysteine (Cys) and methionine (Met) are unique amino acids that contain not only nitrogen (N) but also sulfur (S); thus, they are a source of S for plants under low-soil-SO42- conditions. However, whether low-molecular-weight organic N and S can be utilised by plants or contribute to plant growth remains unknown. Therefore, this study aimed to examine the uptake of organic and inorganic N and S by plants and the role of microbial decomposition under monocropping and intercropping based on C-13, N-15, C-14, and S-35 quad labelling. As indicated by the C-13/C-14 uptake, clover, millet, and ryegrass utilised 0.24-1.68% of the added Cys and Met within 6 h and encountered considerable competition from soil microorganisms. The added Met and Cys were rapidly utilised by microorganisms, and part of the N was subsequently released as inorganic N, which was taken up by plants (N-15-Cys: 9.3-15.2%; N-15-Met: 5.9-13.4%) within 6 h. Six hours after addition, 57.8-78.5% of the 35S-Met and 26.2-56.0% of the S-35-Cys were retained in the microbial biomass, while more S-35-Cys was mineralised to SO42-. Plants took up 5.5-12.4% of S-35-Cys and only 3.4-6.0% of S-35-Met, and S-35 uptake was dominated by inorganic S after the mineralisation of Cys and Met. N uptake from Cys and Met accounted for less than 1% of the total N uptake from the soil, while S uptake from Cys and Met accounted for 9.3-27.0% and 2.8-11.8% of the total S uptake from the soil, respectively. Additionally, Cys was more rapidly mineralised to SO(4)(2-& nbsp;)by soil microbes than Met; the produced SO42- was further utilised by plant roots. The contributions of Cys and Met to the total N and S uptake were the highest in millet monocropping while intercropping altered the relative contributions of organic and inorganic N and S. Overall, soil soluble Cys and Met played a limited role in plant N uptake but were an important source of plant S uptake.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序