Effect of Conservation Tillage with Smash Ridging under Green Manure Condition on the Emission of Greenhouse Gas in the Rice Field Soil

doi:10.3969/j.issn.1000-6362.2019.01.002

Abstract

Abstract:

This continuous field positioning experiment was carried out in the experimental field of Guangxi Academy of Agricultural Sciences from 2016 to 2018 with setting two kinds of farming modes, including the smash ridging and the conventional tillage, along with setting up blank control with no fertilizer, conventional application of chemical fertilizer, single green manure and chemical fertilizer and double green fertilizer and chemical fertilizer 4 kinds of fertilization treatments. After 5 days of rice transplanting in 2018, the greenhouse gas emission flux of rice fields was continuously measured by separate static chamber-meteorological chromatography to study the main greenhouse gas emission characteristics and their cumulative effects of different tillage patterns and fertilization treatments under green manure and analyze the cumulative emission of greenhouse gases and the potential of warming, in order to provide reference for the conservation of tillage and fertilization management mode. The results showed that the CO2 emission flux of conventional fertilizer treatment under the smash ridging was 2.3 times that of the conventional tillage mode. The CH4 emission during the critical period of the rice field peak under the application of double green manure is 2.5 to 3.9 times that of the action of chemical fertilizers. In each treatment, the cumulative CO2 emission from paddy field treated with single-green manure plus chemical fertilizer was the lowest, which was 1469.29kg·ha-1, and the cumulative N2O emission was the least, which was 36.61g·ha-1. The cumulative emission of CH4 from single green manure plus chemical fertilizer under the two farming modes was lower than that of double green manure plus chemical fertilizer. Rational application of green manure plus chemical fertilizer has a certain positive effect on the reduction of greenhouse gas CO2 and N2O emission under the smash ridging mode. The CH4 emissions in paddy fields were related to the green manure volume and the warming potential of greenhouse gases was also affected accordingly. On a certain time scale, applying the conservation tillage with green manuring and smash ridging is an effective measure to reduce and contain agricultural greenhouse gas emissions.

Key words: Green manure, Smash ridging, Greenhouse gas, Emission flux

ZHENG Jia-shun, HU Jun-ming, WEI Xiang-hua, Huang Tai-qing, LI Ting-ting, HUANG Jia-qi. Effect of Conservation Tillage with Smash Ridging under Green Manure Condition on the Emission of Greenhouse Gas in the Rice Field Soil[J]. Chinese Journal of Agrometeorology, 2019, 40(01): 15-24.

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