| Summary: | 碩士 === 國立臺灣大學 === 森林學研究所 === 90 === This research was emphasied on the microscale to study the relationship between tree species and nutrient cycle, particularly focused on the rhizosphere soils. The miltiple-step extraction method was employed to differentiate the different soil properties between bulk and rhizosphere soils.
pH and cation exchange capacity（CEC）of rhizosphere soils are usually lower and greater than bulk soils. On the other hand, the particle size of rhizosphere soils are coarser than bulk soils, respectively. Organic carbon and nitrogen contents of rhizosphere soils are greater than bulk soils. However, the C/N ratio show no significant differences between rhizosphere and bulk soils.
The contents of bioavailable metals in rhizosphere soils are greater than that of bulk soils. The fractionations of each metal showed different distribution. Organic-bound metal showed high concentration in rhizosphere soils. However, the bulk soils contain more in inorganic-bound metals than rhizosphere soils.
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