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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：高知县农田的特征，特别涉及理化特性，矿物学，零电荷点和σ

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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：在日本高知县的四万十地带，秩父地带和桑巴川地带对农田和林地进行了调查。使用土壤的一般和固有特性，例如氧化物含量，零电荷点（ZPC）和粘土矿物学，评估了每个带的土壤肥力。分析了影响ZPC和sigmap [土壤强度？]的因素。在四万十地带，土地开垦广泛，导致未成熟的土壤的物理和化学性质均较差。土壤的改良只能通过持续的土壤管理来实现。铁和铝氧化物作为可变的电荷分数和石灰的施用量导致ZPC的增加，而有机物的含量较高和永久带负电荷的粘土的存在导致较大的sigmap。在秩父和桑巴川带，用于旱地作物的排水稻田分布广泛。尽管观察到由于表层土壤中的聚集而使渗透性得到改善，但是由于前稻田的残留特性，地下土壤的渗透性和保水率尚未得到改善。源自永久性材料的可交换阳离子引起ZPC的较高偏移，而有机物和永久性带负电荷的粘土引起较大的sigmap值，原因与四万十带中的土壤相同。在研究中使用的所有土壤中，石灰的施用都对表层土壤的ZPC值产生了较大的变化，而衍生自母体材料的可交换阳离子使其在地下土壤中的分布更大。天然添加和/或人工添加的有机物含量较高，使表层土壤中的sigmap值较高，而永久性带负电荷的粘土在下层土壤中的值较高。

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