| Summary: | 博士 === 國立屏東科技大學 === 環境工程與科學系所 === 101 === Soil organic carbon (SOC) plays a key role in the global carbon cycle and global change. In this study, we used statistical and geostatisticalmethods toobtain the relation of the spatial heterogeneity of SOC in Taiwan, and to investigatethe factors that influence it, such as topography, altitude,precipitation, and temperature. Our study was based on 14715 soil order samples obtained SOC storage and spatial distribution in Taiwan. The spatial variables of SOC were studied, using geographic information systems (GIS) and geostatistics.This paper explored a GIS-based approach for quantifying and mapping the values of SOC in Taiwan.Interpolated values of SOCdensity and stocks for the depth of30cm, 50cm,100 cmof soil layer, obtained by kriging based on a spherical model, ranged between 1.93 - 16.95 kg C m-2,2.48 - 26.17 kg C m-2,2.49 - 46.09 kg C m-2,respectivelyand the meanvaluewere8.77 kg Cm-2,11.45kg Cm-2,14.95 kg Cm-2,respectively;SOC stocks were estimated to be 315 Tg, 411Tg, and 537Tg,respectively.The correlationsof SOC densities betweenelevation, slope,andprecipitationshowed to be positive(r ＝0.456, 0.521, 0.458, respectively) but negative in temperature (r ＝-0.396)for the depth of 30cmof soil layer. The soil layer was deeper, the relationship was lower. The west and southwest aspect SOC density was the lowest but the southeast was highest.The elevation was the most important factorSOC density because it mightaffect precipitation, slope, temperature, and vegetation type.The SOC density was higher while the elevation> 500m, slope> 15%, annual precipitation> 2500mm, and average temperature &;lt;20℃.
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