稻田甲烷排放非连续测量中采样时间的选择

Time Selection for Non continuous Mesurements of Methane Emission from Rice Paddy Fields

稻田甲烷排放的测量分为手动采样和自动采样两种方法，在非连续的手动采样观测方法中，采样频度和采样时间的选择极为重要．根据实验总结出稻田甲烷的排放有接近正弦曲线的日变化规律．

There are two measurements of CH 4 emission from rice fields:handmatice and automatice sampling.Time and frequency selection is very important for noncontinuous handmatic sampling.According to the statistical analyses of experimental data,methane emission from rice paddies has a daily variation pattern nearly like sine fuction.Sampling at 9∶00￣11∶00 or 21∶00￣23∶00 has the smallest errors.