Journal Article

FZJ-2021-03135

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effect of C:N:P stoichiometry on soil nitrous oxide emission and nitrogen retention

Li, Z. (Corresponding author)FZJ* ; Reichel, R.FZJ* ; Brüggemann, N.FZJ*

2021
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/28860  doi:10.1002/jpln.202000416

Abstract: BackgroundIncorporating high organic carbon amendments (HCA) in the soil can promote microbial nitrogen (N) immobilization. HCA incorporation is thought to reduce N loss via nitrate (NO3−); however, it often increases nitrous oxide (N2O) emissions in upland soils.AimsWe aimed to investigate N2O emission and soil N retention in different soils after co-application of mineral N fertilizer, HCA, and phosphorus (P) fertilizer for alleviating potential microbial P limitation.MethodsWe conducted a 42-day incubation experiment with nutrient-rich silty soil (RUS), nutrient-rich sandy soil (RSS), and nutrient-poor silty soil (PUS). Soils were amended with wheat straw, leonardite or sawdust, with 50 mg N kg–1 soil dry weight (dw) and additionally with 0, 140, or 250 mg P kg–1 soil dw.ResultsThe addition of 250 mg P kg–1 significantly increased CO2 emission by 88.6% and 19.8% in wheat straw-amended PUS and RUS, respectively. In the nutrient-rich soils, HCA co-applied with P mostly did not reduce N2O emissions. In the sandy soil, sawdust and leonardite with 140 mg P kg–1 significantly reduced the cumulative N2O emissions by 76.3% and 76.8%, respectively. In the silty soils amended with wheat straw, the retention of N in the form of microbial biomass and ammonium in soil was paralleled by significantly lower NO3− concentrations.ConclusionsWe conclude that P co-application with HCA, such as wheat straw, might improve N retention, even if N2O emissions did not decline. However, we also found that different soils respond very differently to combined HCA, N and P addition, which calls for further research into the underlying mechanisms.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217) (POF4-217)

Appears in the scientific report 2021

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