Impacts of Different Farming Managements on N2O Emission and Carbon Footprint for Maize from Brown Soil

doi:10.3969/j.issn.1000-6362.2016.03.002

Abstract

Abstract:

In order to study the impacts of different farming measures on N₂O emission for maize production and the carbon footprint during whole maize growth season, the field experiment was conducted in middle and lower reaches of Liaohe Plain in 2014. Five farming measures, including the non-nitrogenous fertilizer control (CK), the regular fertilization by farmers (F), the pyridine coated urea (FP), regular fertilization and biochar (FC), and regular fertilization and straw semi-farm return (FS) were taken in the experiment. The results showed that, (1) N₂O emission in the soil was mainly affected by the fertilization time and fertilization amount, the N₂O emission was keeping high after fertilization application. The N₂O emission after base fertilizing and additional fertilizations accounted for 24.3%-27.3% and 32.0%-38.2% of the accumulated emission amount of N₂O during whole growth season, respectively; (2) As the FP processing can inhibit the rapid transition of ammonium nitrogen in the soil to nitrate nitrogen, the accumulated N₂O emission amount in the maize growth period through FP, FC and FS was reduced by 30.2%, 22.7% and 9.4% compared to regular fertilization (F). The emission effect of FP was optimum choice; (3) The carbon footprint of FP and FC processing was low, which was decreased by 19.5% and 14.8% respectively compared to F; The carbon intensity of FP processing was also the lowest, and its carbon efficiency was the highest. Compared to other farming measures, it belonged to a low-carbon fertilization one with high production and low emission; (4) The direct N₂O emission with the application of nitrogen accounted for the largest share of carbon emission in the whole maize production process (accounting for 74.9%-89.0%), followed by the carbon emission in the fertilizer production process (accounting for 13.4%-17.8%). Therefore, the reduction of nitrogen application and the improvement of nitrogen utilization was the key to reduce the carbon footprint in the maize production process. The carbon emission reduction management measure specific to the spring maize production in the brown soil area in this research was the pyridine coated urea

Key words: Nitrification inhibitor, Biochar, Brown soil, Maize, N₂O emission, Carbon footprint

ZHAO Xun, GUO Li-ping, XIE Li-yong, SUN Xue, ZHAO Hong-liang, XU Jing, PAN Shi-mei. Impacts of Different Farming Managements on N₂O Emission and Carbon Footprint for Maize from Brown Soil[J]. Chinese Journal of Agrometeorology, 2016, 37(03): 270-280.

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Impacts of Different Farming Managements on N₂O Emission and Carbon Footprint for Maize from Brown Soil

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