Impact of maize growth on N 2 O emission from farmland soil

Plant, Soil and Environment

Liang Wang¹ 

关键词: global warming;    Zea mays L.;    nitrification;    fertilization;    greenhouse gas;    nitrogen uptake;    growth dynamic;   

DOI  :  10.17221/774/2018-PSE

学科分类：农业科学（综合）

来源: Czech Academy of Agricultural Sciences

【 摘 要 】

Crop growth is a key factor that effects nitrous oxide (N ₂ O) emission in farmland soil. Clarification and quantification of the impact of maize growth on N ₂ O emission are important to guide maize planting and patterns, which is also useful for building model to simulate N ₂ O emission in an agroecosystem. In this study, we carried out a three-year (2013–2015) field experiment to evaluate the contribution of maize growth on N ₂ O emission using a split-plot design. The factors included planting versus not planting maize, and four rates of nitrogen (N) application (0, 150, 300, 450 kg N/ha). Our results showed the impacts of maize growth on N ₂ O emission decreased linearly with the growth of maize from the 43 ^rd day after sowing ( y = –1.07 x + 26.85, R ² = 0.95). Nitrogen fertilizer application can reduce the impacts of maize growth on N ₂ O emission. The impact of maize growth on soil NH ₄⁺ -N and NO ₃^– -N are similar to N ₂ O emission, and they have a strong correlation. We concluded that maize growth reduces soil N ₂ O emission but N application can exert an antagonistic effect, and the impact of maize growth on soil NH ₄⁺ -N and NO ₃^– -N largely determines the impacts of maize growth on N ₂ O emission.

【 授权许可】

CC BY