土壤肥力和施氮量对双季稻田氧化亚氮排放的互作效应
收稿日期: 2025-04-25
网络出版日期: 2025-09-11
基金资助
国家自然科学基金(31960397)
Interactive Effects of Soil Fertility and Nitrogen Application Rate on N2O Emissions from Double-Cropping Rice Paddies
Received date: 2025-04-25
Online published: 2025-09-11
土壤肥力和施氮量是影响稻田氧化亚氮（N2O）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（FL）、中肥力土壤（FM）和高肥力土壤（FH）3种类型田块，并设置4组氮肥施用水平（即0、90、150、210 kg/hm2，分别用N0、N90、N150、N210表示），旨在阐明土壤肥力和施氮量对红壤性双季稻田N2O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N2O排放量；增加施氮量能够提高早稻季的N2O排放量。对早稻季N2O排放而言， FH和FM相较于FL分别降低34.3%和16.7%，N150和N210处理比N0处理分别显著增加11.3%和21.8%， N90处理与N0处理差异不显著；对于晚稻季N2O排放而言，FH和FM相较于FL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N2O排放上存在显著的互作效应，在FL田块中，与N0相比，N210处理使早稻季N2O排放量显著提高50.7%，而N90和N150处理则无显著影响；在FM和FH田块中，各施氮处理对N2O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N2O减排。
祝建民, 付文涛, 孙文霞, 张宇祥, 黄山, 孙艳妮 . 土壤肥力和施氮量对双季稻田氧化亚氮排放的互作效应[J]. 中国稻米, 2025 , 31(5) : 71 -75 . DOI: 10.3969/j.issn.1006-8082.2025.05.011
Soil fertility and nitrogen application rate are important factors influencing nitrous oxide (N2O) emissions from paddy fields, but the interaction effects between these two remain unclear. In this study, three types of field plots (FL, low-fertility soil; FM, medium-fertility soil; FH, 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/hm2, represented by N0, N90, N150, and N210, respectively), aiming to elucidate the interaction effects of soil fertility and nitrogen application rate on N2O emissions from double-cropping rice paddies. The results showed that improving soil fertility significantly reduced N2O emissions from double-cropping rice paddies, whereas increasing nitrogen application rate increased N2O emissions during the early rice season. For N2O emissions during the early rice season, FH and FM decreased emissions by 34.3% and 16.7%, respectively, compared to FL. Compared with N0 treatment, N150 and N210 treatments during the early rice season increased N2O emissions by 11.3% and 21.8%, respectively, while there was no significant difference between N90 and N0 treatment. For N2O emissions during the late rice season, FH and FM decreased emissions by 30.0% and 13.7%, respectively, compared to FL, while no significant differences among different nitrogen fertilizer treatments. There was a significant interaction effect between nitrogen application rate and soil fertility on N2O emissions during the early rice season. In the FL plot, compared to N0 treatment, the N210 treatment significantly increased N2O emissions by 50.7%, while the N90 and N150 treatments showed no significant difference. In the FM and FH plots, none of the nitrogen fertilizer treatments had significant effects on N2O emissions. Therefore, improving soil fertility combined with appropriate nitrogen application rate is beneficial for mitigating N2O emission in paddy fields.
Key words： double-cropping rice; nitrous oxide; soil fertility; nitrogen fertilizer
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