摘要
设施菜地是农田生态系统N_2O排放的重要来源。本试验选取设施番茄菜地为研究对象,探讨在不同形态氮肥以及温度和季节变化时,N_2O的释放规律及影响其释放的相关主要因子。结果表明:施肥对N_2O排放影响显著,N_2O通量随施肥量增加而增加,且不同氮肥处理的N_2O释放速率为UN(酰胺态氮)>AN(铵态氮)>NN(硝态氮)。随着温度从5℃上升到30℃,N_2O排放峰值由73.07 mg·h-1·m-2增加到133.43 mg·h-1·m-2,但温度继续增加,N_2O排放量有所下降。此外,与无作物种植的设施菜地相比,番茄设施菜地的N_2O排放通量较低,该现象在施加NN时尤为明显,说明番茄对N_2O有一定的吸收作用。
Greenhouse vegetable fields are the significant source for N_2O emission. The objective of this paper was to explore the characteristics of nitrogen emission after different types of nitrogen fertilizers were applied in the protected tomato field, and the soil effecting factors such as such as soil nitrogen content, temperature and crops were investigated. The results showed that application of nitrogen fertilizer resulted in the N_2O emission and the emission amount increased with the increase of fertilizer addition. Moreover, the order for the N_2O release rate was UN（amide nitrogen） AN（ammonium nitrogen） NN（nitrate nitrogen）.N_2O Emission was also enhanced along with the increased temperature. The emission peak was heightened from 73.07 mg/hm2 at 5 ° C to 133.43 mg/hm2 at 30 ° C; however, the temperature continued to increase, the N_2O emission flux declined, the temperature 20-30 °Cwas the most conducive to N_2O Emission. In addition, N_2O emission was lower from the tomato protected plots compared with the plots without crops planting, and this phenomenon was especially evident when application with NN, indicating that some N_2O was absorbed by tomato.
出处
《能源环境保护》
2015年第6期40-43,共4页
Energy Environmental Protection
基金
浙江省自然科学基金项目LY13C030001
关键词
设施菜地
N2O排放
氮肥
作物种植
温度
protected vegetable lands
N2O emission
nitrogen fertilizer
planting
temperature
