| Summary: | 碩士 === 國立臺灣大學 === 農業化學研究所 === 90 === Agricultural soils sampled from each layer of 40 soil profiles of 31 representative soil series in Taiwan, which included 21 of 45 soil management groups of Taiwan. Six biological properties including soil microbial biomass C (MBC), soil microbial biomass N (MBN), nitrogen mineralization capacity (Nmin), and three soil enzymes (acid phosphatase, β-glucosidase, and urease) activities, and other properties (pH, EC, bulk density, inorganic nitrogen, available phosphorous, and organic matter) of the soils sampled were analyzed to establish data archives of soil basic properties. The relationships between the soil enzyme activities and nutrients analyzed were also examined to provide references for soil management strategies of agricultural soils in Taiwan.
The results showed that the microbial biomass C (MBC) contents of the surface soils of agricultural soils of representative soil series in Taiwan ranged from 31.7 to 744 mg kg-1, with a mean value of 235 ± 176 mg kg-1. The microbial biomass N (MBN) contents in the same soils analyzed, ranged from 27.7 to 945 mg kg-1 with a mean value of 292 ± 224 mg kg-1, the nitrogen mineralization capacity (Nmin) ranged from 0.61 to 198 mg kg-1 with a mean value of 33.9 ± 48.9 mg kg-1, the acid phosphatase activity ranged from 58.5 to 738μg p-nitrophenol g-1 soil h-1 with a mean value of 264 ± 217μg p-nitrophenol g-1 soil h-1, the β-glucosidase activity ranged from 11.9 to 632μg p-nitrophenol g-1 soil h-1 with a mean value of 64.2 ± 131μg p-nitrophenol g-1 soil h-1, and the urease activity ranged from 1.55 to 107μg NH4+-N g-1 soil 2 h-1 with a mean value of 32.7 ± 25.0μg NH4+-N g-1 soil 2 h-1.
Simple regression analysis indicated that correlations between the six biological properties and soil organic matter analyzed in this study were statistically positive significant (P<0.001), correlations between the six biological properties and bulk density were statistically negative significant (P<0.001), correlations betweenβ-glucosidase activity and available phosphorous was statistically positive significant (P<0.05), correlations between other five biological properties and available phosphorous were statistically positive significant (P<0.001), correlations between acid phosphatase activity and NH4-N were statistically positive significant (P<0.05), correlations between Nmin and NO3-N were statistically positive significant (P<0.05), correlations between MBN, β-glucosidase activity, and NO3-N were statistically positive significant (P<0.01), correlations between acid phosphatase activity and NO3-N were statistically positive significant (P<0.001).
There were the maximum MBC and Nmin in soil management group 44 (deep, loamy soil , poorly drained), the maximum MBN in soil management group 5 (shallow, loamy soil, slightly poorly drained, no acid), the maximum acid phosphatase activity in soil management group 1 (very shallow, loamy soil ,well drained), the maximumβ-glucosidase activity in soil management group 42 (deep, clay soil ,well drained, no acid), and the maximum urease activity in soil management group 30 (deep, loamy soil ,slightly poorly drainage, calcareous) among 21 soil management groups studied. There were generally higher MBC, MBN, Nmin, acid phosphatase, β-glucosidase, and urease activities in soil management groups 42 and 44. The above results could further provide references for management of agricultural soils in Taiwan.
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