Role of dissolved organic matter in translocation of nutrient cations from organic layer materials in coniferous and broad leaf forests
Role of dissolved organic matter in translocation of nutrient cations from organic layer materials in coniferous and broad leaf forests
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溶解有机物在针叶林和阔叶林有机层物质中养分阳离子迁移中的作用
DOI：
10.1080/00380768.1999.10409346
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发表时间：
1999
影响因子：
2
通讯作者：
K. Yonebayashi
中科院分区：
文献类型：
--
作者：
Kei Nambu;K. Yonebayashi
摘要溶解性有机质（DOM）在土壤中具有多种物质的迁移作用。为研究DOM对森林有机层营养盐向矿质土壤迁移的贡献，采用培养试验方法，对阔叶栎属（Quercus）2种植物--日本扁柏（Japanese Cypress）和日本柳杉（Japanese Cedar）的有机层材料进行了研究。从孵育的有机层材料的水浸出液中含有的无机阴离子比阳离子少得多。负电荷亏损与DOM中的有机阴离子有关。在分解过程中，植物残体表面形成的交换位点保留了部分阳离子，这些阳离子易于被DOM中的有机阴离子洗脱。钾保留最少;在5周的孵育期内，33%至62%的初始内容物用水浸出。二价阳离子Mg和Ca基本上没有被浸出。仍有至多81%和45%，镁和钙，分别转化为初始量。
Abstract Dissolved organic matter (DOM) transports many kinds of substances in soil. In order to investigate the contribution of DOM to the transport of nutrient cations from forest organic layers to mineral soils, incubation experiments were conducted on organic layer materials of two Quercus species (broad leaves), Japanese cypress and Japanese cedar. Water leachates from the incubated organic layer materials contained far smaller amounts of mineral anions than cations. The deficit of negative charges was related to the organic anions of DOM. In the course of the decomposition, exchange sites formed on the surface of the plant residues retained some of the cations, which were prone to elution by organic anions of DOM. Potassium was least retained; 33 to 62% of the initial contents were leached with water during the 5-week incubation period. The divalent cations, Mg and Ca, were not substantially leached. Still at most 81 and 45%, for Mg and Ca, respectively, of the initial amounts were transformed into ...