Maize and soybean experience fierce competition from soil microorganisms for the uptake of organic and inorganic nitrogen and sulphur: A pot test using C-13, N-15, C-14, and S-35 labelling

文献类型： 外文期刊

第一作者： Ma, Qingxu

作者： Ma, Qingxu;Pan, Wankun;Tang, Sheng;Xie, Yinan;Wu, Lianghuan;Ma, Qingxu;Sun, Xiaodan;Chadwick, David R.;Hill, Paul W.;Jones, Davey L.;Si, Linlin;Wu, Lianghuan;Jones, Davey L.

作者机构：

关键词： maize And soybean intercropping; Methionine and cysteine; Organic nitrogen and sulphur; Soil microorganisms

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：5.795； 五年影响因子：6.767 ）

ISSN： 0038-0717

年卷期： 2021 年 157 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) and sulphur (S) are essential nutrients for plant growth. A pot experiment was conducted to verify whether maize and soybean under monoculture and intercropping could utilise N- and S-containing amino acids when competing with soil microorganisms. Maize and soybean were able to utilise methionine (Met; 1.9-2.2% of total addition) and cysteine (Cys; 0.6-1.6% of total addition) as N and S sources, however they faced competition with soil microorganisms. Six hours after microbial uptake, 45.3-64.0% of the S from Met was retained in the microbial biomass, while there was much lower retention from Cys (16.8-34.5%), and 32.5-44.1% of the S from Cys and 15.6-33.3% of that from Met was transformed to SO42-. Cys was a superior S source for plants compared to Met, as higher SO42- release from Cys could support plant growth. Both maize and soybean plants took up NH4+ (98-99% of total N uptake) and SO42- (85-90%) as their main N and S sources from soil. The N from Cys and Met accounted for only similar to 1% of total N uptake from soil, and organic Cys and Met accounted for only similar to 0.2% of the total N uptake, indicating that these two amino acids have limited effects on plant N nutrition, due to the high inorganic N content in agricultural soil. However, the Cys and Met contribution (i.e., organic S uptake and mineral S uptake originating from Cys and Met) to total S uptake (10-15%) was an order of magnitude higher than their N contributions, suggesting that Cys and Met play an important role in soil S nutrition. Intercropping altered the uptake but not the preference for N and S forms in maize and soybean. Overall, the results suggest that S-containing amino acids are important S sources for plant growth even at a lower concentration in soil, but that they play a limited role in plant N nutrition due to a larger inorganic N pool in agricultural soil.

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