Development of 6 channel portable CO_2 sampling system and its practical use

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Portable CO_2 sampling system with 6 channels auto-sampler was developed and its practical use in a larch plantation was performed. A new system can provided information of diurnal change on CO_2 concentration and flow rate at the sampling of 6 different strata in a larch plantation. A machine could work for 4 days with two batters(for auto mobiles, 12 V). This system could work well but we could not confirm the lessen its weight and fail the improvement of waterproof. These are big point for requiring further improving. CO_2 concentration near ground varied largely from 350ppm at daytime to 489ppm before sunrise. In contrast, CO_2 concentration at canopy position ranged from 320ppm before noon and 410ppm during night. These fluctuation was strongly affected by wind direction and speed. A sudden increase of CO_2 concentration may be attributed to precipitation which would increase activities of soil micro-organisms.