设施甜椒土垄内嵌式基质栽培垄的N2O排放通量昼夜变化

为了探究新型栽培方式下甜椒苗期N2O的排放量和排放昼夜变化规律，明确新型栽培方式下最佳的蔬菜减排栽培模式，通过静态箱-气相色谱法分别对土垄栽培、土垄内嵌式基质栽培（SSC）标准垄、SSC矮垄3种栽培模式的内嵌区和整个垄部连续取气测定N2O排放量。结果表明，测定时间段内，设施甜椒苗期的N2O排放通量出现两个排放峰值，呈现昼高夜低的现象。在白天（8:00-16:00），SSC矮垄的垄部N2O的平均排放通量最大，为0.180 mg·m^-2·h^-1，土垄的垄部N₂O的平均排放通量最低，为0.112 mg·m^-2·h^-1；在夜间（17:00-22:00），SSC标准垄的垄部N2O的平均排放通量最大，为0.113 mg·m^-2·h^-1，土垄的垄部N₂O的平均排放通量最小，为0.064 mg·m^-2·h^-1。3种栽培模式的N2O的昼夜累积排放量无显著差异，与土垄栽培相比，SSC矮垄栽培更有利于甜椒的生长。综上，SSC矮垄栽培有利于设施蔬菜的生长，为设施蔬菜减排增效技术研究提供参考。

Diurnal Variation of N2O Emission Flux in Sweet Pepper Soil-ridged Substrate-embedded Cultivation Ridge in Chinese Solar Greenhouse

In order to explore the N₂O emission amount and diurnal variation characteristic of sweet pepper in the new cultivation mode, and identify the optimal cultivation model for reducing N₂O emissions of vegetables, the static opaque chamber method was used to continuously determine the N₂O emission in embedded and whole ridge of three cultivation modes, including soil ridge, soil-ridged substrate-embedded cultivation (SSC) standard ridges, and SSC dwarf ridges. The results showed that during the measurement period, the N₂O emission flux at the seedling stage of sweet pepper presented two emission peaks. The N₂O fluxes manifested a high-emission during the day and low-emission at night. In the daytime (8:00—16:00), the N₂O flux of the SSC dwarf ridge was the largest, which was 0180 mg·m^-2·h^-1, while the N₂O emissions flux at the ridge of soil row was the smallest, 0.112 mg·m^-2·h^-1. At night (17:00—22:00), the emissions flux of the N₂O of the SSC standard ridge was the largest, 0.113 mg·m^-2·h^-1, the emission flux of the ridge portion of the soil ridge was the smallest, which was 0.064 mg·m^-2·h^-1. There was no significant difference in the cumulative emission of day and night among three cultivation modes. In addition, SSC dwarf ridge cultivation was more beneficial for sweet pepper growth than other cultivation modes. In conclusion, SSC dwarf ridge cultivation was beneficial for the vegetable growth in greenhouse. The present study could provide a reference for the technology research of reducing emissions and increasing efficiency of greenhouse vegetables.