冷温帯落葉広葉樹林生態系における土壌呼吸速度の時・空間変動 : 1.面的変動の計測と要因解析

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Soil respiration rates and their relating micro environmental factors were measured in September in 1999 and 2000 to clarify the controlling factors of soil respiration rates in a cool temperate broad leaved deciduous forest. The study site was located on a southwestern slope of Mt. Norikura at about 1,400m asl. The site contained an experimental area of one hectare, subdivided into 100 sub plots, each 10 m by 10 m in size. The rate of soil respiration was measured by the closed chamber method. The micro environmental factors examined included temperature (air, soil), soil water contents, CO_2 concentration, biomass (tree, understory vegetation), soil nitrogen and carbon contents, thickness of soil layers, and topographic conditions. Results of multiple regression analysis were as follows: 1) Rate of soil respiration was strongly affected by topographic conditions, being 5 12% higher at the summit of the hill and 2.5% lower at the bottom of the valley, compared with the average. 2) Multiple regression analysis of 2 year data using the stepwise method clarified that V_<SR>=27.94 X_<ts>-0.58 X_<CO2>+3.26 X_a+17.89 X_l-1.74 X_w+118.44 (R^2=0.707) where V_<SR> is the soil respiration rate, X_<ts> the soil temperature at -10cm, X_<wz> the CO_2 concentration at 0 cm, X_a the relative altitude, X_l the thickness of litter layers and X_w the soil water content. 3) The measured soil respiration rate was high in 1999 (408.2mgCO_2m ^<2>h^<-1> on average) and low in 2000 (354.0mgCO_2m ^2h ^<1> on average), reflecting previous rainfall. The soil water contents in 1999 and 2000 were 33.6% and 20.8%, respectively. Environmental factors in 1999 were still unstable after plenty of rainfall. The high moisture content in 1999 seemed to conceal the effects of other micro-environmental factors.
2003-04-30

冷温帯落葉広葉樹林生態系における土壌呼吸速度の時・空間変動 : 1.面的変動の計測と要因解析

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