红壤稻田不同肥力水平和施氮量对早晚季甲烷排放的互作效应
第一作者：380604391@qq.com
收稿日期: 2023-07-17
网络出版日期: 2023-11-21
基金资助
国家自然科学基金(31960397);国家自然科学基金(32060431);江西省水稻产业技术体系专项(JXARS-02-03);中青年科技创新领军人才专项(赣科计字[2018]175号)
Interactive Effects of Different Fertility Levels and Nitrogen Application Rates on Methane Emissions in Early and Late Season of Red Soil Rice Fields
1st author: 380604391@qq.com
Received date: 2023-07-17
Online published: 2023-11-21
土壤肥力和施氮量是影响稻田甲烷（CH4）排放的重要因子，但二者的互作效应尚不明晰。明确不同土壤肥力下施氮量对稻田CH4排放的影响，对提高稻田CH4排放清单的准确性和改进稻田CH4排放模型具有重要意义。以土壤有机质含量为标准，选择3个不同土壤肥力梯度（低、中、高）的红壤性双季稻田，设置4个施氮水平（N0、N90、N150和 N210分别代表纯氮施用量为 0、90、150和210 kg/hm2），研究了土壤肥力和施氮量对稻田CH4排放的互作效应。结果表明，在早稻季，与低肥力稻田相比，中、高肥力稻田CH4排放量分别显著减少115.7% 和32.4%；与N0处理相比，N90处理的CH4排放量显著增加36.0%，而N150和N210处理分别显著减少32.9%和55.0%。在晚稻季，与低肥力稻田相比，中肥力稻田CH4排放量显著增加40.0%，而高肥力稻田CH4排放量有增加趋势，但两者差异不显著；与N0处理相比，N90处理CH4排放量显著增加46.4%，而N150、N210处理无显著差异。从周年CH4排放量来看，低肥力条件下，N90处理比N0处理显著增加82.8%，N150和N210处理与N0处理相比无显著差异；中、高肥力条件下，各施氮量处理间CH4排放无显著差异。土壤肥力和施氮量对早稻季和周年CH4排放量有显著的互作效应，但对晚稻季CH4排放量无显著互作效应。
贾震, 付文涛, 王海媛, 陈金, 曾勇军, 黄山 . 红壤稻田不同肥力水平和施氮量对早晚季甲烷排放的互作效应[J]. 中国稻米, 2023 , 29(6) : 61 -66 . DOI: 10.3969/j.issn.1006-8082.2023.06.012
Soil fertility and nitrogen (N) rates are important factors affecting methane (CH4) emissions from rice fields, but the interactive effects between them is not clear. It is of great significance to clarify the effects of nitrogen application rates on CH4 emissions in paddy fields under different soil fertility to improve the accuracy of CH4 emission inventory and CH4 emission model in paddy fields. Based on the content of soil organic matter, three soil organic matter gradients (low, medium, and high) were selected, and four nitrogen application rates(0, 90, 150 and 210 kg/hm2) were set to study the interaction effects of soil fertility and nitrogen application rates on CH4 emissions from red soil rice fields. The results showed that, in the early rice season, compared with the low fertility paddy field, the CH4 emissions from the middle and high fertility paddy fields were significantly reduced by 115.7% and 32.4%, respectively; compared with N0 treatment, the CH4 emission in N90 treatment significantly increased by 36.0%, while in N150 and N210 treatment significantly decreased by 32.9% and 55.0%, respectively. In the late rice season, compared with the low fertility paddy field, the CH4 emission in the medium fertility paddy field increased by 40.0%, while in the high fertility paddy field had an increasing trend, but the difference was not significant; the CH4 emission of N90 treatment increased significantly by 46.4% compared with N0 treatment, and there was no significant difference between N0 , N150 and N210 treatment. Under low fertility conditions, compared with N0 treatment, the annual CH4 emissions of N90 treatment significantly increased 82.8% while N150 and N210 treatment had no significant difference; under medium and high fertility conditions, there was no significant difference in annual CH4 emission among different nitrogen application treatments. Soil fertility and nitrogen application rates had significant interaction effects on CH4 emissions in early and annual rice season, but had no significant interaction effects on CH4 emissions in late rice season.
Key words： soil; fertility; nitrogen application rate; double cropping of rice; CH4 emission
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