摘要
基于2004年2月-2010年9月温室菜田长期定位试验,通过室内培养和田间同步,利用静态箱法和硅胶管法分别检测土壤表层N2O通量和剖面N2O浓度的变化,以研究高碳氮比的小麦秸秆施用对设施菜田土壤反硝化过程及N2O排放的影响。结果表明,(1)与对照处理(CK)相比,添加秸秆处理(ST)显著提高0-20cm土层土壤反硝化量,促进N2O还原,增加N2产生量,显著降低追肥灌溉后表层土壤N2O的排放峰值和土壤底层50cm处N2O浓度峰值,但对20-80cm土层土壤的反硝化特征影响较少。(2)秸秆还田有利于降低设施菜田NO-3淋洗风险,秸秆的深施是进一步降低菜田NO-3淋洗的有效途径,有利于土壤底层N2O的再次还原。因此,设施菜田中添加小麦秸秆并深施有利于降低N2O排放和减少NO-3的淋洗。
Based on a long-term greenhouse experiment（ Feb. 2004 -Sep. 2010） ,the objective of the present study was to find out the effects of wheat residue （ high C/N ） amendment on denitrification process and N20 emissions in greenhouse soil, by carrying out simultaneous laboratory and field studies, which used methods of static black-chamber and silicone tube in situ to monitor N20 emissions and N20 concentrations in soil profile, respectively. The results showed that,firstly, compared to the control （CK）, straw-amended treatment（ST） significantly enhanced the denitrification rates and the production of N2 in 0 -20cm soil layer, promoted N20 reduction and reduced N20 emissions and N20 concentrations at the depths of 50era, but had no impact on denitrification characteristics in 20 - 80cm soil layers. Secondly, residue amendments could reduce the risk of NO3- leaching in greenhouses. Residue incorporated into deeper soil layers may be a possible effective way to further reduce the risk of NO3- leaching and to promote followed N20 reduction. Therefore, deep application of wheat residue could decrease N20 emission and NO3- leaching in greenhouses.
出处
《中国农业气象》
CSCD
北大核心
2014年第6期628-634,共7页
Chinese Journal of Agrometeorology
基金
国家自然科学基金(41301258
41230856)
安徽省自然科学基金(1408085QC68)
安徽农业大学青年科学基金重点项目(2013ZD031)
关键词
痕量气体
氮素损失
日光温室
碳氮比
Trace gases
Nitrogen loss
Solar greenhouse
C/N ratio
