华北典型冬麦区农田氧化亚氮通量  

FLUX OF NITROUS OXIDE ON TYPICAL WINTERWHEAT FIELD IN NORTHERN CHINA

作　　者：苏维瀚[1] 宋文质[1] 张桦[1] 曹美秋[1] 路洪荣 周全[1] 曾江海[2] 张玉铭[2] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]中国科学院石家庄农业现代化研究所,石家庄050000

出　　处：《环境化学》1992年第2期26-32,共7页Environmental Chemistry

摘　　要：本工作在华北典型冬麦区测定了小麦返青后各生育期间的氧化亚氮通量。在施肥和不施肥的小麦地和苜蓿地进行了通量测量,初步考察了施肥、浇水、地温等对通量的影响。在土壤相同的条件种植苜蓿和小麦的农田通量值相近似。施肥、浇水和地温增高都增大通量值。而小麦生长后期,尽管地温增高,通量值却逐渐下降,这与土壤速效氮耗竭有关。同时,讨论了土壤中产生氧化亚氮的机制和实验结果,并提出今后工作设想。Nitrous oxide flux has been studied on a typical winter wheat field in northern China(37°54′N,114°42′E).Gaseous samples were collected from a sampling chamber of 1 × 1 × 1m3 settled on the field and analysed with an eletron capture detector gas chro-matography. The measurement schedule coincided with major biological phenomena of the winterwheat growth in fertilized and unfertilized field. For comparison measurement was performed also in alfalfa field. The effects of fertilization,irrigation, soil temperature on flux were studied.It is shown that all of these factors are conducible to the emission of nitrous oxide from the soil, with the similar soil the fluxes on winterwheat and alfalfa farmland do not have obvious difference between each other. Diel variability of fluxes shows that there is positive correlation between the fluxes and soil temperatures. The fluxes at different situation variate in a range of 2-46μgN/m2·h.Mechanism of nitrous oxide production in the soil is considered too. Further research on monitoring and modeling is needed.

关 键 词：氧化亚氮 小麦 土壤 监测 

分 类 号：X833.01[环境科学与工程—环境工程]