High-precision continuous measurements of the methane flux over a forest using a laser spectrometer

使用微气象和小室方法测量了温带森林上的甲烷通量。微气象方法在量化具有空间代表性的通量方面具有优势，而小室方法可用于理解过程。两年多的连续测量表明，森林起到了甲烷汇的作用，而且夏季的甲烷汇比冬季的大。甲烷年沉降量为868 mg CH4m-2yr-1。甲烷通量受土壤水分和土壤温度的控制，土壤水分的增加制约甲烷汇的形成，而土壤温度的升高促进甲烷汇的形成。

Methane flux was measured over a temperate forest using the micrometeorological and chamber methods. The micrometeorological method has an advantage to quantify spatially representative flux, whereas the chamber methods can be used for understanding processes. More than two-year continuous measurements showed that the forest acted as a methane sink, and the sink was greater in summer than winter. The annual methane sink was 868 mg CH4 m-2 yr-1. The methane fluxes were controlled by soil water content and soil temperature, where increase in soil water content restricted the methane sink whereas increase in soil temperature enhanced the methane sink.