植物营养与肥料学报2012，Vol.18Issue(4)：860-867,8.
设施菜田土壤剖面中的反硝化特征
Characteristics of denitrification in different soil layers in a greenhouse vegetable cropping system
摘要
Abstract
Silicone tubes installed at 50 cm and 90 cm respectively in situ were applied to monitor concentrations of N2O in soil profile in a greenhouse tomato cropping field,and a robotized incubation system was used to measure potential production of N2O,NO and denitrification.The results show that the occurrences of the N2O peaks at the depths of 50 cm and 90 cm were just after irrigation/fertilization under the conventional N treatment（CN）,and the N2O concentration at the depth of 50 cm is higher than that at the depth of 90 cm,varying from 2.15 to 50.77 μL/L at 50 cm,and from 2.74 to 14.05 μL/L at 90 cm.Under the control treatment（CK）,the N2O concentrations at both depths are almost not affected by irrigation,varying from 1.43 to 2.75 μL/L.Denitrification mainly occurres in the layer of 0-40 cm,and due to carbon limitation,denitrification in the layer of 40-100 cm is relatively weak.However,after 48 hours incubation with carbon addition,denitrification in the lower soil layer shows a similar denitrification potential as the surface soil.Under anaerobic conditions,the N2O and NO emissions from the upper layer（0-40 cm） are much higher than those of the lower layer（40-100 cm）.High N2O concentrations are observed at the 50 and 90 cm in situ,might be diffused from the surface soil.Therefore,field flux measurements might underestimate the N2O emission.Since the lower layer has similar denitrification potential as the surface soil,denitrification loss should not be ignored under the conditions with leaching of both nitrate and organic carbon.关键词
设施菜田/反硝化/剖面/N2O的排放Key words
greenhouse vegetable cropping/denitrification/soil profile/N2O emission分类
农业科技引用本文复制引用
宋贺,徐新超,王敬国,陈清,郭景恒,王进闯..设施菜田土壤剖面中的反硝化特征[J].植物营养与肥料学报,2012,18(4):860-867,8.基金项目
国家自然科学基金 （）
现代农业产业技术体系北京市果类蔬菜创新团队项目资助. （）
