New classification systems for tropical organic-rich deposits based on studies of the Tasek Bera Basin, Malaysia

被引:67
作者
Wüst, RAJ
Bustin, RM
Lavkulich, LM
机构
[1] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
[2] Univ British Columbia, Dept Soil Sci, Vancouver, BC V6T 1Z4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
tropical peat; peat classification; peat texture; ash content; carbon content;
D O I
10.1016/S0341-8162(03)00022-5
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Most schemes in common use for field and laboratory classification of peats were developed in boreal and humid temperate regions and do not recognize the distinctive features and specific uses of tropical peals, such as those of the Tasek Bera Basin in tropical Peninsular Malaysia. The important aspects of peat texture (morphology of constituents and their arrangement) and laboratory ash content (residue after ignition) need modification to be valuable for classifying these and other tropical peat deposits. In the Tasek Bera Basin, most of the deposits would not be considered as peat according to some classification schemes, even though most have C contents >25%. We propose a new three-group (fibric, hemic, sapric) field texture classification applicable to tropical organic deposits, which is similar to the system of the US Soil Taxonomy. The classification is based on the following factors: (1) visual examination of the morphology of the peat constituents (texture); and (2) estimates of fiber content and matrix (finest fraction of peat consisting of,highly humified organic matter and inorganic material). The classification is applicable to all organic deposits with <65% ash (i.e., >35% loss on ignition). We also present a new laboratory classification of organic soils based on ash and C content. The US Soil Taxonomy classifies organic soils as having more than 12-18% organic C, depending on clay content. Ash content and these limits for organic soils allow the discrimination of four main groups: peat, muck, organic-rich soil/sediment and mineral soil/sediment. Peat is defined as having an ash content of 0-55%, muck 55-65%, organic-rich soil/sediment 65-80% and mineral soil/sediment 80-100%. The peat class is further subdivided into very low ash (0-5%), low ash (5-15%), medium ash (15-25%), high ash (25-40%) and very high ash (40-55%) subclasses. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:133 / 163
页数:31
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