前含水率和有机废物处理对肯尼亚部分土壤微团聚体稳定性的影响

P. Kamau, B. Mochoge
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引用次数: 0

摘要

由于土壤结构在土壤生产力中的作用,人们对土壤结构的研究越来越感兴趣。大多数关于土壤结构的研究都涉及原生颗粒成团聚体的组织及其对水分离的抵抗力(Quirk;1978;Caron and Kay, 1982)。絮凝性和骨料稳定性之间的区别并没有得到许多研究者的重视。根据Sharma和Tunny(1978)的研究,絮凝作用在最细的粘土颗粒的基础水平上起作用,由多价阳离子介导,而团聚体的稳定是由有机和合成副产品作用下土壤颗粒和团聚体的胶结作用产生的。微生物多糖在稳定粘土颗粒方面的作用,即使在非常小的数量也得到了强调(Foster, 1981;Rasiah et al., 1992)。报道的大多数研究涉及强聚集(对水稳定的聚集)(Harris等,1966;汉布林和格陵兰,1977;Greenland et al., 1962;Rasiah et al., 1992)。很少有人对评估控制土壤微聚集或分散的因素表现出兴趣(DeshPande等人,1968;Krishna Murti等人,1977;Shanmu Ganathan;外形尺寸,1982;爱默生,1983;外形尺寸,1984;爱默生和格陵兰,1990;BenHur et al ., 1992),而微团聚体在结壳、地表密封、土壤渗透性、入渗特性、通气性、土壤侵蚀、幼苗出苗和土壤生产力潜力等方面发挥着重要作用(Dong et al ., 1983;Miller and Baharuddin, 1986;尼斯,1994;Le Bissonnais, 1996)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Antecedent Moisture Content and Organic Waste Amendment on the Stability of Microaggregates of Some Kenyan Soils
There is an increased interest in the study of soil structure because of its role in soil productivity. Most of the studies on soil structure relate the organisation of primary particles into aggregates and their resistance to water detachment (Quirk; 1978; Caron and Kay, 1982). The distinction between flocculation and aggregate stability has not always been appreciated by many researchers. According to Sharma and Tunny (1978), flocculation operates at the fundamental level of the finest clay particles and is mediated by polyvalent cations while stabilisation of aggregates results from the cementation of soil particles and aggregates by the action of organic and synthetic by-products. The role of microbial polysaccharides in stabilising clay particles even at very small quantities has also been emphasised (Foster, 1981; Rasiah et al., 1992). Most of the studies reported involve strong aggregation (aggregates that are stable to water (Harris et al, 1966; Hamblin and Greenland, 1977; Greenland et al., 1962; Rasiah et al., 1992). Little interest has been shown in evaluating factors controlling microaggregation or dispersion in soils (DeshPande et al, 1968; Krishna Murti et al., 1977; Shanmu Ganathan; Oades, 1982; Emerson, 1983; Oades, 1984; Emerson and Greenland, 1990; BenHur et al, 1992) and yet microaggregation plays an important role in crusting, surface sealing, soil permeability, infiltration characteristics, aeration, soil erosion, seedling emergence and soil productivity potential (Dong et al, 1983; Miller and Baharuddin, 1986; Loch, 1994; Le Bissonnais, 1996).
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