摘要
加气灌溉技术是在地下滴灌的基础上发展起来的一种土壤通气增氧的新型灌溉方式,可以有效避免土壤含氧量低、通气性差给作物带来的危害。探明加气灌溉(AI)技术下红壤土呼吸速率变化规律与作用机理,为加气灌溉技术的推广提供理论依据。本研究基于中国热带农业科学院国家土壤质量湛江观测实验站,对比研究了加气灌溉与不加气灌溉处理下土壤呼吸速率的动态变化,并分析了土壤呼吸速率变化对土壤含水率及土壤含氧量的响应关系。结果表明:2种处理下土壤呼吸速率的日变化特征曲线基本一致。总体上呈现出单峰曲线变化,土壤呼吸速率峰值出现在11:00左右,最小值出现在23:00—次日3:00,2种试验处理日变化规律相似,AI和CK处理下土壤呼吸速率日均值分别为1.64μmol/(m^(2)·s)和1.53μmol/(m^(2)·s),AI处理显著高于CK处理(P<0.05)。季节变化下AI处理下的土壤呼吸速率一直高于对照组CK,在整个生长期内基本均存在一定的差异性。与常规种植方式(CK)相比,加气灌溉分别提高了土壤呼吸速率和土壤含氧量7.50%和27.75%,降低了土壤含水率4.90%,土壤含水率和含氧量分别可以解释AI和CK处理下红壤土呼吸变化的85.04%、61.15%和69.92%、41.61%,土壤含水率和含氧量共同解释了AI和CK处理下土壤呼吸变化的41.2%~58.4%。AI处理下土壤含水率和含氧量对土壤呼吸交互作用拟合效果更优。该研究证明加气灌溉技术主要通过提高土壤氧气含量进而提高土壤呼吸速率,研究结果为补充完善加气灌溉下土壤呼吸排放机理及加气灌溉技术在我国红壤地区的推广应用提供数据支撑和技术参考。
Aerated irrigation technology is a new type of soil aeration and oxygen-enhancing irrigation method devel-oped on the basis of underground drip irrigation,which can effectively avoid the harm to crops caused by low soil oxy-gen content and poor aeration.The study is aimed to prove the law and mechanism of the red soil respiration rate under aerated irrigation(AI)technology,and provide a theoretical basis for the popularization of aerated irrigation technology.This study is based on the National Soil Quality Observation and Experimental Station,Chinese Academy of Tropical Agricultural Sciences.It compared the dynamic changes of soil respiration rate under aerated and non-aerated irrigation treatments,and analyzed the effects of changes in soil respiration rate on soil moisture and soil oxygen,and the amount of response relationship.The daily variation characteristic curves of soil respiration rate under the two treatments were basically the same.In general,it showed a single-peak curve change.The peak of soil respiration rate appeared at about 11:00,and the minimum appeared at about 23:00-3:00 in the morning.The diurnal changes of the two experimental treatments were similar.The daily average values of the rates of soil respiration under AI and CK treatments was 1.64μmol/(m^(2)·s)and 1.53μmol/(m^(2)·s),respectively.The AI treatment was significantly higher than that of CK(P<0.05).Under seasonal changes,the soil respiration rate under the AI treatment was always higher than that of the control,and there were basically certain differences throughout the growth period.Compared with conventional planting methods(CK),aerated irrigation increased soil respiration rate and soil oxygen content by 7.50%and 27.75%,and reduced soil water content by 4.90%.Soil water content and oxygen content could explain AI and respiration changes of red loam under CK treatment were 85.04%,61.15%and 69.92%,41.61%.The soil moisture content and oxygen content together explained 41.2%-58.4%of the soil respiration changes under AI and CK tr
作者
于珍珍
王宏轩
邹华芬
孙海天
汪汇源
汪春
李海亮
YU Zhenzhen;WANG Hongxuan;ZOU Huafen;SUN Haitian;WANG Huiyuan;WANG Chun;LI Hailiang(College of Engineering,Heilongjiang Bayi Land Reclamation University,Daqing,Heilongjiang 163319,China;South Sub-tropical Crops Research Institute,Chinese Academy of Tropical Agricultural Sciences/National Soil Quality Zhanjiang Observation and Experimental Station,Zhanjiang,Guangdong 524000,China;College of Mechanical and Electrical Engineering,Henan Agri-cultural University,Zhengzhou,Henan 450002,China;Institute of Science and Technology Information,Chinese Academy of Tropical Agricultural Sciences,Haikou,Hainan 571101,China)
出处
《热带作物学报》
CSCD
北大核心
2022年第1期110-118,共9页
Chinese Journal of Tropical Crops
基金
中国热带农业科学院基本科研业务费专项资金(No.19CXTD-31)
广东省农村科技特派员重点派驻任务(粤科函农字[2020]409)
海南省自然科学基金青年基金项目(No.719QN282)。
关键词
红壤土
玉米
加气灌溉
土壤呼吸
含水率
含氧量
red loam
corn
aerated irrigation
soil respiration
water content
oxygen content
