Short-Term Responses of Nitrous Oxide Emissions and Concentration Profiles to Fertilization and Irrigation in Greenhouse Vegetable Cultivation

S.RIYA; MIN Ju; ZHOU Sheng; SHI Wei-Ming; M.HOSOMI

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Short-Term Responses of Nitrous Oxide Emissions and Concentration Profiles to Fertilization and Irrigation in Greenhouse Vegetable Cultivation

机译：温室蔬菜栽培中一氧化二氮排放和浓度曲线对施肥和灌溉的短期响应

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In vegetable cultivation,the majority of N2O emissions occur after fertilization; it is therefore important to understand any factors contributing to this process.An experiment was conducted to investigate short-term N2O dynamics following topdressing in a greenhouse vegetable field in South China.During two topdressing processes,three different urea-N treatments with irrigation were conducted in May and June in a tomato (Lycopersicum esculentum) cultivation.The N2O fluxes,soil concentration profiles and soil environments at the 0-60 cm depths at 10 cm intervals were measured both immediately prior to and 5 days after topdressing.The N2O fluxes before topdressing ranged from 6.7±2.1 to 55.0±28.8μg N m-2 h-1 ; even higher numbers were recorded in highly fertilized plots.The NO3--N accumulation in the soil caused by vegetable cultivation during the 5 years prior to the start of the experiment,resulted in high background N2O fluxes.One day after topdressing (1 DAT) in May and June,N2O fluxes increased,which coincided with sharp increases in soil N2O concentrations at depths of 2.5 and 15 cm and in NO3--N and NH4+-N contents at depths of 0-20cm.From 1 to 5 DAT,fluctuations in the N2O fluxes did not harmonize with the N2O concentrations at a depth of 2.5 cm,which was attributed to different gas diffusion rates at depths of 0-10 cm.These results suggested that surface soil N and environmental conditions were crucial for determining the short-term N2O ebullitions during topdressing in greenhouse vegetable cultivation.

机译：在蔬菜栽培中，N2O的大部分排放是在施肥后发生的。因此，重要的是要了解造成这一过程的任何因素。进行了一项实验，研究了华南温室蔬菜田追肥后的短期N2O动态。在两个追肥过程中，进行了三种不同的灌溉尿素-N处理在5月和6月在番茄（Lycopersicum esculentum）上进行耕作。在施肥前和施肥后5天，以10 cm的间隔测量0-60 cm深度处的N2O通量，土壤浓度分布和土壤环境。追肥范围为6.7±2.1至55.0±28.8μgN m-2 h-1;在高施肥地块上记录的数量甚至更高。在试验开始前的5年中，蔬菜种植在土壤中引起的NO3--N累积，导致N2O通量较高。追肥后一天（1 DAT） 5月和6月，N2O通量增加，这与2.5和15 cm深度的土壤N2O浓度以及0-20cm深度的NO3--N和NH4 + -N含量急剧增加是一致的。从1到5 DAT，波动N2O中的通量与2.5 cm深度处的N2O浓度不协调，这归因于0-10 cm深度处不同的气体扩散速率。这些结果表明表层土壤N和环境条件对于确定短温室蔬菜栽培追肥期间长期N2O蒸发。

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《土壤圈（英文版）》 |2012年第6期|764-775|共12页
作者
S.RIYA; MIN Ju; ZHOU Sheng; SHI Wei-Ming; M.HOSOMI;
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作者单位

Graduate School of Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588(Japan);

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588(Japan);

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China);

Institute of Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588(Japan);

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Short-Term Responses of Nitrous Oxide Emissions and Concentration Profiles to Fertilization and Irrigation in Greenhouse Vegetable Cultivation

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