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本文主要研究广东咸酸田土壤硫的基本化学性质和影响咸酸田发生演化的硫的主要化学过程,探讨土壤硫的化学状况与咸酸田诊断分类和利用改良的关系等。研究结果表明:广东咸酸田土壤含硫量极高,主要是黄铁矿(FeS_2)。在咸酸田发生过程中形成一种淡黄色新生体——黄钾铁矾[KFe_3(SO_4)_2(OH)_6]。黄铁矿等硫化物的氧化是咸酸田土壤呈强酸性的主要原因。土壤硫的化学状况特别是黄铁矿和黄钾铁矾在剖面上的分布、数量和形态等与咸酸田的发育程度和改良熟化有密切关系。土壤硫的主要来源是红树林对海水中SO_4~(2-)的吸收利用和富集。土壤硫化学性质对咸酸田的诊断和分类有重要意义。
This paper mainly studies the basic chemical properties of sulfur in the acidified acid field of Guangdong and the main chemical processes that affect the evolution of sulfur in the acidified field, and discusses the relationship between the chemical status of soil sulfur and the diagnostic classification and utilization improvement of acidified acid fields. The results show that the acid content of the acid field in Guangdong is extremely high, mainly of pyrite (FeS 2). A yellowish newborn body, jarosite [KFe_3 (SO_4) _2 (OH) _6], was formed in the acid field. Oxidation of sulfides such as pyrite is the main reason for the strong acidity of the salicylic acid field soil. The chemical status of soil sulfur, especially the distribution, quantity and morphology of pyrite and jarosite in the cross section are closely related to the development of the salicylic acid field and the improvement of ripening. Soil sulfur is the main source of mangrove on seawater SO 4 2- absorption and enrichment. Soil sulfur chemistry is of great importance for the diagnosis and classification of salicylic acid field.