摘要
通过室内模拟和塑料大棚试验,研究了普通尿素和矿物改性包膜尿素对土壤pH值及大棚内有害气体浓度变化的影响.结果表明,在室内模拟试验条件下,两种氮肥施用初期均导致土壤pH值上升,并于1周后达到最大值,上升幅度超过50%,随后开始下降,至第5周回到初始水平.大棚内施用两种氮肥均使棚内NH3、NO2和O3浓度增加,其中施用普通尿素处理的NH3、NO2日均挥发量均大于矿物改性包膜尿素;施用普通尿素处理使大棚内土壤的NH3、棚内NO2和O3的最高浓度达到42.36、41.95和86.00μg.m-3.d-1,3种气体浓度均达到了有害气体伤害植物的临界阈值;NH3、NO2挥发强度受棚温和光照强度的影响,O3浓度随光照强度变化而改变.
With simulation test and plastic greenhouse experiment, this paper studied the effects of urea and minerals- coated urea on the soil pH and harmful gases concentrations in plastic greenhouse. The results showed that under simulated condition, the application of these two N fertilizers led to an initial increase of soil pH, which reached the maximum （ an increment of 〉 50% ） within the first week and dropped to the initial level by the end of the fifth week. In plastic greenhouse, applying urea and coated urea resulted in the increase of NH3 , NO2 and 03 concentrations. The daily volatilization amount of NH3 and NO2 was higher in urea treatment than in coated urea treatment, and the highest value in urea treatment was 42. 36 μg · m^-3 . d^-l for NH3 , 41.95 μg · m^-3 · d^ -1 for NO2, and 86. 00 μg · m^-3 · d^-1 for O3. The volatilization intensity of NHs and NO2 was influenced by temperature and sunlight, while the O3 concentration was influenced by sunlight.
出处
《应用生态学报》
CAS
CSCD
北大核心
2006年第9期1604-1608,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(40271110)
国家"863"计划资助项目(2001AA246023).
关键词
尿素
包膜尿素
PH值
有害气体浓度
大棚
Urea, Coated urea, pH, Harmful gases concentration, Plastic greenhouse.
