Effects of Different Nitrogen Application Levels on Net Nitrogen Transformation Rate and Greenhouse Gas Emission in Cropland Black Soil

doi:10.11924/j.issn.1000-6850.casb2021-1078

Abstract

Abstract:

The study aims to understand the effects of different nitrogen (N) application levels on N transformation and greenhouse gas emissions in cropland black soil, and provide scientific guidance for rational fertilization in cropland. Cropland black soil in Heilongjiang Province was selected to study the responses of net N mineralization rate, net nitrification rate, N₂O and CO₂ emission rates and cumulative emissions to different N application levels [0 (N0), 40 (N40), 60 (N60) and 80 (N80) mg N/kg] through a laboratory incubation experiment. The results showed that the net N mineralization rate of N0 treatment was 0.03 mg N/(kg·d), while that of N40, N60 and N80 treatments was -0.71, -1.01 and -1.27 mg N/(kg·d), respectively, which indicated the occurrence of net N immobilization in the three treatments. Nitrogen application significantly promoted nitrification in soil, soil net nitrification rate of N0 treatment was 0.32 mg N/(kg·d), while that of N40, N60 and N80 treatments was 15.2, 19.7 and 24.0 times that of N0 treatment, respectively. The N₂O emission rate increased significantly with the increase of N application level within 0-60 mg N/kg, however, when the N application level increased to 80 mg N/kg, N₂O emission rate was significantly lower than that of N60 treatment. The N₂O emission ratio of N0 treatment was 8.11‰, N application significantly decreased the ratio to 1.48‰, 1.72‰ and 1.15‰ under N40, N60, and N80 treatments, respectively, and no significant difference among the three N application rates was observed. Compared with N0 treatment, N application significantly inhibited CO₂ emission, whereas, CO₂ cumulative emission was not affected by N application level. This study show that N application level significantly affect soil net N transformation rate and greenhouse gas emissions, and the results are of practical significance for deeply understanding the N transformation regularity in cropland black soil and the rational application of N fertilizer.

Key words: nitrogen fertilizer, black soil, mineralization, nitrification, N₂O, CO₂

CLC Number:

S153

LANG Man, YUAN Xiaohang, LI Ping. Effects of Different Nitrogen Application Levels on Net Nitrogen Transformation Rate and Greenhouse Gas Emission in Cropland Black Soil[J]. Chinese Agricultural Science Bulletin, 2022, 38(31): 93-100.

Figures/Tables 5

References 44

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