|Title:||本省中部水稻田土壤之特質及其生成||Other Titles:||The Characteristics and Genesis of Paddy Soils in Central Part of Taiwan||Authors:||梁鉅榮
|Issue Date:||1-Dec-1974||Publisher:||農業試驗所||Journal Volume:||23||Journal Issue:||4||Start page/Pages:||219-241||Source:||農業研究||Abstract:||
12．各類土壤受種植水稻之影響如下：a. 土壤質地細粘或中等者均有生成水稻土之可能。B. 營盤粘土原為灰粘土，亦育成水稻土。
This study includes the soils of paddy field of Taichung, Changhwa, Namtou and Yuanlin, the central part of this province. The objective is to study the improvement of soil management, soil fertilization and soil classification in order to emphasize the recognization and understanding of proper characteristics of the paddy soils in Taiwan. Nine soil profiles of representative soils according to their important patterns were sampled and item of the physico-chemical properties were analyzed. All the results are shown on appendix 1, 2 and 3. All the characteristics and the genesis of the 9 soil profiles are discussed in relation with 13 tables and 20 figures. It may be summaries as follows:
1. All the nine representative soil profiles are developed from alluvial deposite, as shown on Table 1. There are 3 great groups, 4 sub-groups, 9 soil series and 9 soil types, based on the result of classification which is shown on Table 2 with the soil profile description on Table 3, Figure 1, 2 and 3.
2. With all the soil sample studies fine texture occupies the largest proportion and there is not any coarsed texture found. The mechanism of the genesis of aquorizem is rather complicated. However, the soils there is fine or moderate in texture throughout. It may be developed in any cases.
3. The relation between the bulk density and the soil depth in a given profile is shown on Fig. 4, 5 and 6. The surface soil of the 3 aquorizems shows the same trend, but they are different below 20 cm. The average bulk density of the 51 samples is 1.5 g/cc the lower limit is no less than 1.l g/cc and the highest is over 1.8 g/cc. It is shown on Table 9.
4. The result of the porosity of the various layers of the representative soil profiles is shown on Table 10. The average maximum is in the surface soils and the average minimum is in the sub-surface soils.
5. The distribution patterns of the free iron and free manganese of the three profiles of aquorizems show the accumulation of these elements in the sub-surface soil by leaching from surface soil as shown in Fig. 7 and Table 6.
6. The curves of the free iron and free manganese of the paddy lowland gley soils and the Tsao-hu clay loam of the paddy lowland alluvial soils show the similar trend as the B horizon of the aquorizems as shown in Fig. 8 and 9. It is affected by the higher content of the original clay particles. Based on the texture of the lazers respectively there is not any illuviation or eluviation present. It is shown on Table 6.
7. The changing pattern of soil available silica and C. E. C. with the soil depth in a given profile varies with different types of soil. Two of the three soil types of the aquori-zems go down from surface to sub-soil as shown in Fig. 10. The curves of the 3 soil types of paddy lowland gley soils are different from each other as shown in Fig. 11 but the curves of the available silica of the surface soils of paddy lowland alluvial soils are nearly alike as shown in Fig. 12.
8. From the pH patterns of the soil profiles, it is concluded that there are 5 belonging to B types, 3 to D types and 1 to C types as shown in Fig. 13, 14 and 15.
9. The variation of the average C/N ratio among the different soil types are very small. However, the aquorizems shows greater differences base on the maximum and the minimum as shown on Table 11. The variation of the average C/N ratio among the surface soils and the sub-soils are small, it is shown on Table 12.
10. The changing pattern of organic matter c ontent with the soil depth in a given profile varies with different types of soil. Aquorizems are apparant as shown in Fig. 16. Two of the three soil profiles of the paddy lowland gley soils have the same pattern as shown in Fig. 17. The trend of the curves above 40 cm of all the 3 types of the paddy lowland alluvial soils look alike as shown in Fig. 18.
11. The result of the thermal gravitational analysis is shown on Table 13, X-ray diffraction pattern is shown in Figures 19:1, 19:2, 19:3, 20:1, 20:2 and 20:3, it shown that there is some illite small amount of chloride and some illite-montmorillonite mixed lazers in Tsao-hu clay loam and a lot of chloride and illite is present in Nam-kan-shui silty loam, especially in the bottom lazer of the profile.
12. The influence of various soil groups by rice planting is as following: a) It is possible to developed aquorizems from the soils with fine or moderate texture. b) Ying-pan clay is the typical sample of the aquorizem which has developed from gley soils.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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