Effects of different nitrogen application rates on soil water stable aggregates and N2O emission in winter wheat field

doi:10.13287/j.1001-9332.202111.024

Abstract

Abstract: Excessive nitrogen application would deteriorate soil structure and increase greenhouse gas emission. We set up six treatments, i.e., N₀, N₁₂₀, N₁₈₀, N₂₄₀, N₃₀₀and N₃₆₀(nitrogen application rates of 0, 120, 180, 240, 300 and 360 kg·hm^-2, all straws returned into the field in situ) in the nitrogen fertilizer experimental site to investigate the effects of different nitrogen application rates on soil N₂O emission, soil water-filled porosity (WFPS), soil temperature, nitrate and ammonium contents, composition and stability of water stable aggregates in winter wheat filed in 2018-2020. The results showed that there was a significant positive correlation between soil N₂O emission and nitrogen application rate. There was no correlation between WFPS and nitrogen application rate. Soil temperature in the 0-10 cm layer decreased significantly with the increases of nitrogen application rates. There was a significant positive correlation between nitrate and ammonium contents and nitrogen application rate. With the increases of nitrogen application rates, the content of water stable aggregates with diameter >2 mm decreased, while that of water-stable aggregates with diameter <0.5 mm increased. The particle size of soil water-stable aggregates also decreased gradually. There was a significant negative correlation between nitrogen application rate with mean weight diameter (MWD) and geometric mean diameter, while no correlation with fractal dimension. The fitting equation between MWD and N₂O emission flux was y=3928.3e^-2.171x (R²=0.55, P<0.001), indicating that N₂O emission increased markedly as MWD decreasing. The increases in nitrogen application rate reduced soil temperature in the 0-10 cm layer, increased nitrate and ammonium contents, decreased the average particle size of soil water stable aggregates, and the stability of soil aggregates, and increased soil N₂O emission.

Key words: winter wheat, nitrogen application, soil physicochemical property, N₂O, water stable aggregate.

CHEN Jin-sai, SUN Wei-hao, WANG Guang-shuai, Abubakar Sunusi Amin, GAO Yang. Effects of different nitrogen application rates on soil water stable aggregates and N₂O emission in winter wheat field[J]. Chinese Journal of Applied Ecology, 2021, 32(11): 3961-3968.

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Effects of different nitrogen application rates on soil water stable aggregates and N₂O emission in winter wheat field

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