摘要
土壤肥力和施氮量是影响稻田氧化亚氮(N_(2)O)排放的重要因素,但二者的互作效应尚不清晰。本研究依据土壤有机质含量,选取低肥力土壤(F_(L))、中肥力土壤(F_(M))和高肥力土壤(F_(H))3种类型田块,并设置4组氮肥施用水平(即0、90、150、210 kg/hm^(2),分别用N_(0)、N_(90)、N_(150)、N_(210)表示),旨在阐明土壤肥力和施氮量对红壤性双季稻田N_(2)O排放的互作效应。结果表明,提升土壤肥力能够显著降低双季稻田的N_(2)O排放量;增加施氮量能够提高早稻季的N_(2)O排放量。对早稻季N_(2)O排放而言,F_(H)和F_(M)相较于F_(L)分别降低34.3%和16.7%,N_(150)和N_(210)处理比N0处理分别显著增加11.3%和21.8%,N_(90)处理与N0处理差异不显著;对于晚稻季N_(2)O排放而言,F_(H)和F_(M)相较于F_(L)分别降低30.0%和13.7%,而不同氮肥处理之间则无显著差异。施氮量和土壤肥力在早稻季稻田N_(2)O排放上存在显著的互作效应,在F_(L)田块中,与N_(0)相比,N_(210)处理使早稻季N_(2O)排放量显著提高50.7%,而N_(90)和N_(150)处理则无显著影响;在F_(M)和F(H)田块中,各施氮处理对N_(2)O排放均无显著影响。因此,提升土壤肥力的同时配施适宜的氮肥用量有利于稻田N_(2)O减排。
Soil fertility and nitrogen application rate are important factors influencing nitrous oxide(N_(2)O)emissions from paddy fields,but the interaction effects between these two remain unclear.In this study,three types of field plots(F_(L),low-fertility soil;F_(M),medium-fertility soil;F_(H),high-fertility soil)were selected based on the soil organic matter content,and four levels of nitrogen application rates were set(i.e.,0,90,150,and 210 kg/hm^(2),represented by N_(0),N_(90),N_(150),and N_(210),respectively),aiming to elucidate the interaction effects of soil fertility and nitrogen application rate on N_(2)O emissions from double-cropping rice paddies.The results showed that improving soil fertility significantly reduced N_(2)O emissions from double-cropping rice paddies,whereas increasing nitrogen application rate increased N_(2)O emissions during the early rice season.For N_(2)O emissions during the early rice season,F_(H) and F_(M) decreased emissions by 34.3% and 16.7%,respectively,compared to F_(L).Compared with N_(0) treatment,N_(150) and N_(210) treatments during the early rice season increased N_(2)O emissions by 11.3% and 21.8%,respectively,while there was no significant difference between N90 and N0 treatment.For N_(2)O emissions during the late rice season,F_(H) and F_(M) decreased emissions by 30.0% and 13.7%,respectively,compared to F_(L),while no significant differences among different nitrogen fertilizer treatments.There was a significant interaction effect between nitrogen application rate and soil fertility on N_(2)O emissions during the early rice season.In the F_(L) plot,compared to N_(0) treatment,the N_(210) treatment significantly increased N_(2)O emissions by 50.7%,while the N_(90) and N_(150) treatments showed no significant difference.In the F_(M) and F_(H) plots,none of the nitrogen fertilizer treatments had significant effects on N_(2)O emissions.Therefore,improving soil fertility combined with appropriate nitrogen application rate is beneficial for mitigating N_(2)O emission in paddy fields.
作者
祝建民
付文涛
孙文霞
张宇祥
黄山
孙艳妮
ZHU jianmin;FU Wentao;SUN Wenxia;ZHANG Yuxiang;HUANG Shan;SUN Yanni(Key Laboratory of Crop Physiology,Ecology and Genetic Breeding,Ministry of Education/Jiangxi Agricultural University,Nanchang 330045,China;Agricultural Technology Extension Center of Xinjian District,Nanchang 330038,China)
出处
《中国稻米》
北大核心
2025年第5期71-75,80,共6页
China Rice
基金
国家自然科学基金(31960397)。
关键词
双季稻
氧化亚氮
土壤肥力
氮肥
double-cropping rice
nitrous oxide
soil fertility
nitrogen fertilizer
