Effects of soil and vegetation types on soil respiration rate in larch [Larix leptolepis] plantations and a mature deciduous broadleaved forest in northern Japan
2006
Yanagihara, Y.(Hokkaido Univ., Sapporo (Japan)) | Shibata, H. | Matsuura, Y. | Koike, T.
Seasonal changes in the soil respiration rate, soil water content, temperature at 5cm depth in soil and C/N in soil were detected in four different forests in Hokkaido, northern Japan for evaluating CO2 efflux from forest ecosystem for two years. Each forest was mature deciduous broadleaved forest (more than 300 years old after eruption of Mt. Tarumae) and declining larch plantation (as of 46 years old at 2000) invaded several deciduous broadleaved saplings in Tomakomai Experimental Forest, a mature larch plantation in National Forest (as of about 49 years old at 2000) and a young larch plantation (as of 27 years old at 2000) with dense coverage of dwarf Sasa bamboo in Teshio Experimental Forest. Soil respiration of each site correlated exponentially with soil temperature but not soil water content. Prior to the measurement of soil respiration, its variation was determined with a 22 x 22m plot for 112 points in June. According to this, we selected the place for soil respiration measurement. Root density was almost constant of 1.0g/100cubic m for the old larch plantation but increased from 1 to 3g/100cubic m to for young one, which positively correlated with soil respiration. C/N ratio of a young larch plantation was slightly larger than that of old one. Based on these results, we discussed the factors affecting soil respiration in northern Japan.
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