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Changes in Nitrogen Pools in the Maize-Soil System after Urea or Straw Application to a Typical Intensive Agricultural Soil: A N-15 Tracer Study

文献类型： 外文期刊

作者： Zhang, Jie 1 ; He, Ping 2 ; Wei, Dan 3 ; Jin, Liang 3 ; Zhang, Lijuan 1 ; Li, Ling 5 ; Zhao, Shicheng 2 ; Xu, Xinpeng 2 ; Zh 1 ;

作者机构： 1.Hebei Agr Univ, Coll Resources & Environm Sci, Baoding 071000, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Plant Nutr & Fertilizers, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Plant Nutrient & Resources, Beijing 100097, Peoples R China

4.Heilongjiang Acad Agr Sci, Inst Soils, Fertilizers & Environm Resources, Harbin 150086, Peoples R China

5.Chinese Acad Agr Sci, China Agr Sci Technol Press, Beijing 100081, Peoples R China

关键词： bulk soil; rhizosphere soil; soil N pools; maize N uptake; pot experiment

期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）

ISSN：

年卷期： 2021 年 11 卷 6 期

页码：

收录情况： SCI

摘要： A maize pot experiment was conducted to compare the difference of N distribution between bulk and rhizospheric soil after chemical fertilizer with or without soil straw amendment at an equivalent N rate using a N-15 cross-labeling technique. Soil N pools, maize N and their N-15 abundances were determined during maize growth. The urea plus straw treatment significantly (p < 0.05) increased the recovery of urea N in soil and 26.0% of straw N was assimilated by maize. Compared with urea treatment in bulk soil, urea plus straw treatment significantly (p < 0.05) increased the concentration and percentage of applied N as dissolved organic N (DON) and microbial biomass N (MBN) from milk stage to maturity, increased those as particulate organic N (PON) and mineral associated total N (MTN) throughout maize growth and decreased those as inorganic N (Inorg-N) from the eighth leaf to the silking stage. Compared with bulk soil, rhizospheric soil significantly (p < 0.05) decreased the concentration and percentage of applied N as PON and increased those as Inorg-N and MTN in both applied N treatments from the silking stage, and significantly (p < 0.05) decreased the concentration and percentage of applied N as microbial biomass N (MBN) in the urea plus straw treatment. Overall, straw N was an important N source and combined application of chemical fertilizer with straw increased soil fertility, with the rhizosphere regulating the transformation and supply of different N sources in the soil-crop system.

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