ポドゾル性土壌に関する実験土壌学的試み : (I)乾性ポドゾルと湿性鉄型ポドゾルについて

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An experimental pedogenetic study was carried out 'in situ' for clarifying the mechanism of podozolization of dry podozolic soil (PD), that is one of the typical podozolic type at Mt. Kokushidake, Nagano-ken. The differences between pedogenetic mechanism of dry podozolic soil (PD) and that of wet iron podozolic soil (PW (i)) at Mt. Naeba, Niigata-ken were also clarified. Tension free lysimeters were set at the bottom of AO layer of PW (i) and PD and at the bottom of B2 horizon of PD in order to collect soil water. As shown in Fig. 1, some of these lysimeters contained 'scoria', which was expected to react with certain elements included in the soil water. The soil water collected by each lysimeter was analyzed to determine pH, C, Ca, Mg, Fe, Al, NH_4-N, NO_3-N and organic-N. The amount of collected soil water without 'scoria' of AO layer of PW (i) was far larger than that of AO layer and B horizon of PD (Fig. 2). Although the concentration of aluminium was not different significantly, those of other investigated elements were different between soil waters collected through lysimeters with 'scoria' and that with-out 'scoria', for instance, concentrations of inorganic and organic matters were lower in soil waters through 'scoria'. However, it is noteworthy that concentrations of Ca and Mg were a little higher in soil water collected through 'scoria' at the bottom of B2 horizon of PD. It seems to indicate that most of inorganic and organic matters were absorbed by 'scoria' from the soil water leached through AO layer at least (Fig. 3〜7). The correlation coefficients between different elements were calculated in soil water collected under AO layer of PD and PW (i) and B horizon of PD using 'scoria' and with-out 'scoria'. They were not evident and were not changed in soil water of PW (i) even when 'scoria' was used or not. When 'scoria' was used in soil water of PD, the correlation coefficients between some pairs of investigated elements showed higher values (AO layer and B horizon…NO_3-N: Ca, Mg and Ca: Mg) and those between some other pairs showed lower values (AO layer…C: Ca, NH_4-N. B horizon…Ca: Al) (Table 3).
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ポドゾル性土壌に関する実験土壌学的試み : (I)乾性ポドゾルと湿性鉄型ポドゾルについて

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