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  

Interactive Effects of Different Fertility Levels and Nitrogen Application Rates on Methane Emissions in Early and Late Season of Red Soil Rice Fields

作　　者：贾震 付文涛 王海媛 陈金[2,3] 曾勇军[1] 黄山[1] JIA Zhen;FU Wentao;WANG Haiyuan;CHEN Jin;ZENG Yongjun;HUANG Shan(Key Laboratory of Crop Physiology,Ecology and Genetic Breeding,Ministry of Education,Jiangxi Agricultural University,Nanchang 330045,China;Soil and Fertilizer&Resources and Environmental Institute,Jiangxi Academy of Agricultural Science,Nanchang 330200,China;Jinggangshan Institute of Red Soil/Jinggangshan Branch of Jiangxi Academy of Agricultural Sciences,Ji’an,Jiangxi 343016,China)

机构地区：[1]江西农业大学作物生理生态与遗传育种教育部重点实验室,南昌330045 [2]江西省农业科学院土壤肥料与资源环境研究所,南昌330200 [3]井冈山红壤研究所/江西省农业科学院井冈山分院,江西吉安343016

出　　处：《中国稻米》2023年第6期61-66,共6页China Rice

基　　金：国家自然科学基金(31960397,32060431);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)

摘　　要：土壤肥力和施氮量是影响稻田甲烷(CH_(4))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CH_(4)排放的影响,对提高稻田CH_(4)排放清单的准确性和改进稻田CH_(4)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(N_(0)、N_(90)、N_(150)和N_(210)分别代表纯氮施用量为0、90、150和210 kg/hm^(2)),研究了土壤肥力和施氮量对稻田CH_(4)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CH_(4)排放量分别显著减少115.7%和32.4%;与N_(0)处理相比,N_(90)处理的CH_(4)排放量显著增加36.0%,而N_(150)和N_(210)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CH_(4)排放量显著增加40.0%,而高肥力稻田CH_(4)排放量有增加趋势,但两者差异不显著;与N_(0)处理相比,N_(90)处理CH_(4)排放量显著增加46.4%,而N_(150)、N_(210)处理无显著差异。从周年CH_(4)排放量来看,低肥力条件下,N_(90)处理比N_(0)处理显著增加82.8%,N_(150)和N_(210)处理与N_(0)处理相比无显著差异;中、高肥力条件下,各施氮量处理间CH_(4)排放无显著差异。土壤肥力和施氮量对早稻季和周年CH_(4)排放量有显著的互作效应,但对晚稻季CH_(4)排放量无显著互作效应。Soil fertility and nitrogen(N)rates are important factors affecting methane(CH_(4))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 CH_(4)emissions in paddy fields under different soil fertility to improve the accuracy of CH_(4)emission inventory and CH_(4)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/hm^(2))were set to study the interaction effects of soil fertility and nitrogen application rates on CH_(4)emissions from red soil rice fields.The results showed that,in the early rice season,compared with the low fertility paddy field,the CH_(4)emissions from the middle and high fertility paddy fields were significantly reduced by 115.7%and 32.4%,respectively;compared with N_(0)treatment,the CH_(4)emission in N_(90)treatment significantly increased by 36.0%,while in N_(150)and N_(210)treatment significantly decreased by 32.9%and 55.0%,respectively.In the late rice season,compared with the low fertility paddy field,the CH_(4)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 CH_(4)emission of N_(90)treatment increased significantly by 46.4%compared with N_(0)treatment,and there was no significant difference between N_(0),N_(150)and N_(210)treatment.Under low fertility conditions,compared with N_(0)treatment,the annual CH_(4)emissions of N_(90)treatment significantly increased 82.8%while N_(150)and N_(210)treatment had no significant difference;under medium and high fertility conditions,there was no significant difference in annual CH_(4)emission among different nitrogen application treatments.Soil fertility and nitrogen application rates had significant interaction effects on CH_(4)emissions in early and annual rice season,but had n

关 键 词：土壤 肥力 施氮量 双季稻 CH_(4)排放 

分 类 号：S511.062[农业科学—作物学]