DISSOLUTION OF BIOGENIC OPAL AS A FUNCTION OF ITS PHYSICAL AND CHEMICAL-PROPERTIES
DISSOLUTION OF BIOGENIC OPAL AS A FUNCTION OF ITS PHYSICAL AND CHEMICAL-PROPERTIES
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DOI：
10.2136/sssaj1980.03615995004400040043x
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发表时间：
1980-01-01
影响因子：
2.9
通讯作者：
WILDING, LP
中科院分区：
文献类型：
--
作者：
BARTOLI, F;WILDING, LP
控制蛋白石溶解的因素是比表面积、铝含量、水化状态、年龄和包裹营养组织的有机物生物降解率。这些因素与不同来源的蛋白石是同变的。最近(6个月古)落叶成因的蛋白石植硅体水化程度最高(11%)，铝含量较低(2%)，溶解程度最高(9 mg Si/L，冷水；50 mg Si/L，热水；3 mg Si/L，在自然环境下)。相比之下，针叶成因的蛋白石更老(30mo)，更坚硬，铝含量更高(3-4%)，被包裹在生物降解较慢且溶解较低的凋落物中(2-3 mg Si/L，冷水；20 mg Si/L，热水；0.5 mg Si/L，在自然环境下)。与林下森林植被有关的禾本科植物硅体通常在上述性质和溶解方面居中。生物蛋白石的溶解度接近地质蛋白石-A。它相对稳定，在大多数土壤环境中不够稳定，不足以支持观测到的可溶性硅水平。[更好地了解这些蛋白石成分的稳定性和就地溶解性，应有助于更好地了解土壤中的生物地球化学硅循环。]
Factors which control opal dissolution are specific surface area, Al content, hydration state, age and rate of organic matter biodegradation of the encasing vegetative tissues. These factors are covariable with opal of different origin. Recent (6 mo. old) opal phytoliths of deciduous origin are most hydrated (11%), have lower Al content (2%) and highest dissolution (9 mg Si/l, cold water; 50 mg Si/l, hot water; and 3 mg Si/l under natural environments). In contrast, opal of coniferous origin is older (30 mo.), more rigid, has higher Al content (3-4%), is encased within litter that is more slowly biodegradable and yields lower dissolution (2-3 mg Si/l, cold water; 20 mg Si/l, hot water; and 0.5 mg Si/l under natural environments). Gramineous phytoliths associated with understory forest vegetation generally are intermediate in the above properties and dissolution. Biogenic opal has solubilities that approximate geologic opal-A. It is relatively stable and not sufficiently labile under most soil environments to support observed soluble Si levels. [A better knowledge of the stability and in situ solubility of these opaline components should prove useful in better understanding the biogeochemical Si cycle in soils.].