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首页> 外文期刊>Agricultural and Forest Meteorology >Nitrous oxide flux measurements from an intensively managed irrigated pasture using micrometeorological techniques.
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Nitrous oxide flux measurements from an intensively managed irrigated pasture using micrometeorological techniques.

机译：使用微气象技术从集约化灌溉牧场中测量一氧化二氮通量。

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摘要

Nitrous oxide emissions from flood-irrigated pastures grazed for dairy production were measured over 2 years using micrometeorological techniques. Turbulent atmospheric transfer coefficients derived from fluxes of sensible heat and momentum were used to estimate the N2O fluxes from concentrations measured at two heights. Careful data selection excluded data for periods of very low wind-speed and strong stability when transfer coefficients were unreliable. The measurements demonstrated the dynamic nature of N2O emissions following grazing, fertiliser application and irrigation. Daily-averaged emissions ranged from <4 to close to 170 g N2O-N ha-1 day-1. High emissions due to denitrification occurred when soil temperatures were >15 degrees C, nitrogen was available following grazing or fertiliser application and the water filled pore space of the soil was in the range 65-95%. N2O emission factors of 0.23+or-0.06% for grazing were similar to those for fertiliser application plus grazing (0.32+or-0.12%)..
机译：使用微气象技术在2年内测量了放牧用于乳品生产的洪水灌溉牧场中的一氧化二氮排放量。由显热通量和动量得出的湍流大气传递系数用于根据在两个高度处测得的浓度估算N2O通量。当传输系数不可靠时，仔细的数据选择会排除风速极低且稳定性强的数据。测量结果证明了放牧，施肥和灌溉后N2O排放的动态性质。日平均排放量范围从<4到接近170 g N2O-N ha-1 day-1。当土壤温度> 15摄氏度时，由于反硝化作用而产生的高排放物，放牧或施肥后可获得氮，土壤中充水的孔隙空间为65-95％。放牧的N2O排放因子为0.23+或-0.06％，类似于施肥和放牧的N2O排放因子（0.32+或-0.12％）。

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