农业科学与技术:英文版
農業科學與技術:英文版
농업과학여기술:영문판
Agricultural Science & Technology
2012年
2期
361-364
,共4页
CO2%N2O%黑土%测定时间
CO2%N2O%黑土%測定時間
CO2%N2O%흑토%측정시간
CO2%N2O%Black soil%Measurement time
[目的]探讨测定时间对黑土区CO2和N2O排放通量的影响,确定排放通量的最佳测定时间,以期为黑土区农田温室气体减排提供科学依据。[方法]以黑土区长期肥料定位试验为平台,采用静态箱式法研究了小麦3个关键生育期(抽穗期、灌浆期和成熟期)CO2和N2O排放的日变化动态,揭示不同测定时段黑土区CO2和N2O排放通量的差异。[结果]土壤CO2和N2O排放通量日变化较大,变化范围分别为CO2206~552mg(/m·2h)和N2O51~295μg(/m2·h)。在不同生育期CO2呈单峰曲线变化,峰值出现在中午12:00,峰谷出现在凌晨3:00;N2O排放通量在抽穗期白天较小,而夜间排放量大。如果不考虑小麦生育期对CO2和N2O排放通量的影响,测定CO2排放代表性时间段在6:00~8:00或16:00~21:00;测定N2O时间段在8:00~10:00或16:00~21:00;若同时测定CO2和N2O排放通量,最佳测定时间在16:00~18:00。若在通常的观测时间9:00~12:00进行观测,CO2和N2O的较正系数分别为0.81和0.90。[结论]该研究结果为黑土区农田温室气体减排提供了科学依据。
[目的]探討測定時間對黑土區CO2和N2O排放通量的影響,確定排放通量的最佳測定時間,以期為黑土區農田溫室氣體減排提供科學依據。[方法]以黑土區長期肥料定位試驗為平檯,採用靜態箱式法研究瞭小麥3箇關鍵生育期(抽穗期、灌漿期和成熟期)CO2和N2O排放的日變化動態,揭示不同測定時段黑土區CO2和N2O排放通量的差異。[結果]土壤CO2和N2O排放通量日變化較大,變化範圍分彆為CO2206~552mg(/m·2h)和N2O51~295μg(/m2·h)。在不同生育期CO2呈單峰麯線變化,峰值齣現在中午12:00,峰穀齣現在凌晨3:00;N2O排放通量在抽穗期白天較小,而夜間排放量大。如果不攷慮小麥生育期對CO2和N2O排放通量的影響,測定CO2排放代錶性時間段在6:00~8:00或16:00~21:00;測定N2O時間段在8:00~10:00或16:00~21:00;若同時測定CO2和N2O排放通量,最佳測定時間在16:00~18:00。若在通常的觀測時間9:00~12:00進行觀測,CO2和N2O的較正繫數分彆為0.81和0.90。[結論]該研究結果為黑土區農田溫室氣體減排提供瞭科學依據。
[목적]탐토측정시간대흑토구CO2화N2O배방통량적영향,학정배방통량적최가측정시간,이기위흑토구농전온실기체감배제공과학의거。[방법]이흑토구장기비료정위시험위평태,채용정태상식법연구료소맥3개관건생육기(추수기、관장기화성숙기)CO2화N2O배방적일변화동태,게시불동측정시단흑토구CO2화N2O배방통량적차이。[결과]토양CO2화N2O배방통량일변화교대,변화범위분별위CO2206~552mg(/m·2h)화N2O51~295μg(/m2·h)。재불동생육기CO2정단봉곡선변화,봉치출현재중오12:00,봉곡출현재릉신3:00;N2O배방통량재추수기백천교소,이야간배방량대。여과불고필소맥생육기대CO2화N2O배방통량적영향,측정CO2배방대표성시간단재6:00~8:00혹16:00~21:00;측정N2O시간단재8:00~10:00혹16:00~21:00;약동시측정CO2화N2O배방통량,최가측정시간재16:00~18:00。약재통상적관측시간9:00~12:00진행관측,CO2화N2O적교정계수분별위0.81화0.90。[결론]해연구결과위흑토구농전온실기체감배제공료과학의거。
[Objective] The aim was to investigate and reveal effect of measurement time on emission flux of CO2 and N2O to ensure the optimum time of emission flux, in order to provide scientific reference for emission reduction of greenhouse gas in black soil region. [Method] Based on experiment of long-term fertilizer location in black soil region, the paper studied on daily dynamic variation of CO2 and N2O discharge in 3 key growth periods (booting stage, grain-filling stage and mature stage) to reveal differences of CO2 and N2O emission flux in different times. [Result] Daily variations of CO2 and N2O emission flux were large, from 205 mg/(m2·h) to 552 mg/(m2·h) for CO2 and from 51 h to 295 μg/(m2·h) for N2O. Trend of CO2 discharge in different growth times showed a unimodal curve, and the peak was at noon of 12:00 and the peak valley was at 3:00 am; discharge of N2O was small in day time at booting stage and large at night. Regardless of rice growth period effect on CO2 and N2O emission flux, representative time of CO2 discharge was 6:00-8:00 or 16:00-21:00; and time of N2O was 8:00-10:00 or 16:00-21:00; if CO2 and N2O emission fluxes were measured simultaneously, the optimum time was 16:00-18:00; if the measurement was started during 9:00-12:00, correction coefficients of CO2 and N2O were 0.81 and 0.90, respectively. [Conclusion] The result provided scientific reference for reduction of greenhouse gas emission in black soil region.