周细红1;曾清如1, 2;毛小云3;张利田2;廖柏寒1;铁柏清1;廖宗文3
ZHOU Xihong1; ZENG Qingru1,2;MAO Xiaoyun3; ZHANG Litian2,;LIAO Bohan1; TIE Baiqing1; LIAO Zongwen3
1College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China;2Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3College of Resaurces and Environment, South China Agricutural University, Guangzhou 510642, China
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86.00 μg·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.