Biochar amendment benefits N-15 fertilizer retention and rhizosphere N enrichment in a maize-soil system

文献类型： 外文期刊

第一作者： Zhang, Jie

作者： Zhang, Jie;Qiu, Shaojun;Zhang, Jie;Zhang, Lijuan

作者机构：

关键词： Maize N uptake; Soil N transformation; Bulk soil; Rhizospheric soil; N-15 tracer method

期刊名称：GEODERMA （ 影响因子：7.422； 五年影响因子：7.444 ）

ISSN： 0016-7061

年卷期： 2022 年 412 卷

页码：

收录情况： SCI

摘要： Biochar amendments regulate fertilizer nitrogen (N) transformation in soil and crop N uptake. To elucidate the effect of biochar amendment on the translocation of fertilizer N in a crop-soil system during crop growth, a maize pot experiment was conducted using an isotope tracer approach. The treatments were: without N application; N-15-labelled urea; and N-15-labeled urea plus biochar. During maize growth, biochar amendment increased root biomass, total crop N uptake, and urea N retention in soil. In bulk and rhizospheric soils, biochar amendment significantly (P < 0.05) increased urea N retention in soil total N (TN), microbial biomass N (MBN), particulate organic N (PON) and mineral associated total N (MTN) from the eighth leaf stage (V8) to physiological maturity (R6) and decreased fertilizer N retention in inorganic N and dissolved organic N from stages V8 to silking (R1). Relative to bulk soil, rhizospheric soil promoted urea N retention in TN, inorganic N, MBN, and MTN under both fertilizer treatments, and biochar application enlarged this difference for MBN; rhizospheric soil enhanced PON mineralization resulting in a significantly (P < 0.05) lower PON from stages R1 to R6 when compared with bulk soil, and biochar application retarded this mineralization. These findings unveiled that biochar application increased fertilizer N retention by increasing MBN, PON, and MTN and that biochar application benefited the enrichment of fertilizer N in rhizospheric soil.

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