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本文介绍了农田N2O排放连续自动测定系统的方法原理、系统整体构造和气路配置,并通过对华北平原旱地土壤夏玉米季N2O排放的连续观测,比较了连续自动测定方法与传统手动间歇取样测定方法的差异。结果表明,夏玉米季N2O排放具有明显的日排放规律,且在三叶期和十叶期施肥后存在明显的释放高峰;通过选取7:20、8:30、9:40、10:50、12:00、13:20、14:30、15:40、16:50和18:00不同采样时间的测定结果,分别模拟了间隔为3d和6d的排放总量,结果表明,间隔取样的累积排放结果与连续观测结果的差异,与采样当天中具体的采样时间紧密相关,间隔估算结果随着采样时间的延后具有先升高后降低的趋势,与N2O的日排放规律相一致。本研究中,不同时间间隔对估算结果影响不明显。
This paper introduces the method principle, system overall structure and gas path configuration of continuous automatic measurement system for farmland N2O emission. By continuous observation of N2O emission from summer maize season in dryland of North China Plain, the methods of continuous automatic determination and traditional manual intermittent sampling are compared The difference. The results showed that the N2O emission in summer maize season had a significant daily emission pattern, and there was a clear release peak after fertilization in the three-leaf stage and the ten-leaf stage. By choosing 7:20, 8:30, 9:40, 10:50, The results of different sampling times at 12: 00,13: 20,14: 30,15: 40,16: 50 and 18:00 respectively simulated the total emissions at intervals of 3d and 6d. The results showed that the cumulative sampling interval The difference between the emission result and the continuous observation result is closely related to the specific sampling time in the sampling day. The interval estimation result firstly increases and then decreases with the sampling time delay, which is consistent with the daily emission law of N2O. In this study, the impact of different time intervals on the estimation results is not obvious.