农田NO 排放的自动观测 - 环境科学.PDF

19983 ENVIRONMENT AL SCIENCE M ar. , 1998 * NO 郑循华　王跃思　王明星　沈壬兴 李老土　金继生 ( , 100029) ( , 215128) NO , . , . NO , NO . NO . NO 615, 114k hm - 2NO 27, NO . , , , , . NO Automatical Measurement of NO Emission from Croplands Zhen XunhuaWan YuesiWan M in x in Shen Renx in ( Institute of Atmospheric Physics, Chinese Academy of Sciences, Beij in 100029) ) Li LaotuJin Jishen ( W uxian In stitute of A ricultural Sciences, Suzh ou 215128) , Abstract The principle structure and procedure of an automated system for the measur ement of NO emission from croplands was described in detail. Some experimental results taken from w heat fields of Southeast China w ith this automated sy stem w ere also discussed. In this study , the diurnal variation of NO emission from w heat fields occurs in late autumn w as found to be similar w ith that of temperature. M eanw hile, a seasonal variation of NO emission w as obviously observed, w ith the mean value of NO emission fluxes measured in late autumn about 615 . , times hi her than that in w inter Additionally the seasonally total amount of NO emission from - 114 - 2 27 a plot w ith N fertilization at a r ate of k hm w as as times as that from the plot with- out N -fertilization. Such results mean that temperatur e and application of N-fertilizer are tw o key factors w hich re ulate the NO emission from w heat fields in late autumn and in w inter. , , , , Keywords NO emission automatical measurement automated system croplands emissi