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首页> 外文期刊>日本土壤肥料学雑誌 >Characteristics of the farmlands in Kochi Prefecture with special reference to physico-chemical properties, mineralogy, zero point of charge and sigmap
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Characteristics of the farmlands in Kochi Prefecture with special reference to physico-chemical properties, mineralogy, zero point of charge and sigmap

机译：Kochi县农田特征特别参考物理化学特性，矿物学，零充电点和SIGMAP

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摘要

The farmlands and forested area were surveyed in the Shimanto Belt, Chichibu Belt and Sambagawa Belt in Kochi Prefecture, Japan. The soil fertility in each belt was evaluated using the general and inherent properties of the soils, such as oxide contents, zero point of charge (ZPC), and clay mineralogy. The factors affecting ZPC and sigmap [soil strength?] were analysed. In the Shimanto Belt, land reclamation was conducted widely, resulting in immature soils with both poor physical and chemical soilproperties. Improvement of the soils could be accomplished only by continuous soil management. The amount of Fe and Al oxides as variable charge fractions and lime application caused a greater increase in ZPC, while the higher content of organic matterand presence of permanent negative-charged clays caused a larger sigmap. In the Chichibu and Sambagawa Belts, drained paddy fields for upland crops were distributed widely. Although improvement in the permeability due to aggregation in the surface soilswas observed, subsoils had not yet been improved in terms of both permeability and retention of water due to remnant properties of the former paddy fields. Exchangeable cations derived from permanent materials caused a higher shift in ZPC, while organicmatter and permanent negative-charged clays caused a larger sigmap value, for the same reason as for the soils in the Shimanto Belt. In all the soils used in the study, the application of lime brought a greater change in ZPC value for the surface soil, while exchangeable cations derived from parent materials made it larger in the subsoils. The higher content of organic matter added naturally and/or artificially application made the value of sigmap higher in the surface soils, and permanent negative-charged clays gave higher values in the subsoils.
机译：在日本科希府的Shimanto Belt，Chichibu Belt和Sambagawa腰带上进行了调查农田和森林区域。使用氧化物含量，零充电点（ZPC）和粘土矿物学的一般和固有特性评估每条带中的土壤肥力。分析了影响ZPC和Sigmap的因素[土壤强度吗？在Shimanto皮带中，陆地填海层面被广泛进行，导致物理和化学贫困物质和化学物质的土壤不成熟。土壤的改善只能通过连续的土壤管理来实现。作为可变电荷级分和石灰施用的Fe和Al氧化物的量引起ZPC的增加，而永久性负荷粘土的有机物质和存在的较高含量导致较大的Sigmap。在奇琴和Sambagawa皮带中，普通作物的排水稻田被广泛分布。虽然观察到表面土壤中的聚集在渗透性上的渗透性的改善，但由于前稻田的残留性能，渗透性和水的渗透性尚未得到改善。源于永久性材料的可更换阳离子导致ZPC的较高速度，而有机型器和永久性负荷粘土造成较大的Sigmap值，同样为Shimanto带中的土壤的原因。在研究中使用的所有土壤中，石灰的应用使表面土壤的ZPC值更大，而来自母体材料的可交换阳离子使其在底层中更大。自然和/或人工上添加的有机物质的含量较高使得表面污染中的Sigmap的值较高，并且永久性负电荷粘土在基底产生了更高的值。

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