Review of the inorganic geochemistry of peats and peatland waters

In order to evaluate the sources of DOC in a subalpine bog, we compare the lignin and carbohydrate compositions of aquatic fulvic acid isolated from the bog (BogWFA) with the fulvic acids isolated from water leachates of two local plants, sedge (sedgeL-FA) and willow leaves (willowL-FA), and of the peat in the bog (peatL-FA). The bogW-FA and peatL-FA have similar biomarker compositions and both differ significantly from either of the fulvic acids from the water leachate of the plants. Thus, the biomarker data strongly suggest that the peat, and not fresh leaffall, provides most of the aquatic fulvic acid to the bog at this time of year (Fall). However, additional sources of lignin- and carbohydrate-depleted fulvic acid to the bog are also needed to quantitatively match the relatively low levels of recognizable biochemicals in the aquatic fulvic acid from the bog. The unusual lignin compositions of both plant leachates suggest that nonstructural lignin phenol producing components, such as lignans, are part of the water-extractable component of plants. These extractable plant products could potentially contribute to aquatic fulvic acids in other environments or at different times of the year.

Biomarker compounds as source indicators for dissolved fulvic acids in a bog

/pdf/agricultural-use-and-extent-of-british-columbia-wetlands-1uvm72qrty.pdf

Agricultural use and extent of British Columbia wetlands

Chemical and physical properties of selected organic soil samples were studied in relation to the chemical status of the associated ground water. Soil analyses included standard chemical analyses, fibre content, bulk density, particle density, hydraulic conductivity and water retention properties. In situ water chemical analysis included temperature, conductivity, dissolved oxygen and pH. Laboratory measurements of dissolved Ca, Mg, N, K, Si, NO3, F and Cl are also reported. The results are interpreted with reference to the surface expression and overall terrain morphology of the sampling area resulting in the formation of different peat types and associated vegetation. Physical and chemical data indicate a relationship between degree of decomposition and magnitude of various parameters. The distinction between bog and fen areas in terms of the level of dissolved electrolytes permits the prediction of the nature of the material comprising the organic soil. The distinctive properties of organic soils are d...

Chemical, physical, and land-use investigations of organic terrain

Portable equipment has been used to measure selected environmental parameters in situ. A battery-operated potentiometer used in conjunction with several specific ion electrodes, a platinum redox electrode, and a combination pH electrode were used to obtain ion activity, pH, and Eh measurements of natural systems. In addition, dissolved oxygen concentration was measured using an oxygen electrode and battery-operated meter. Results from the analysis of several streams are presented to illustrate the application of the technique to field measurements of streams as an indicator of environmental disturbance. Information collected also allowed for the differentiation of different types of organic terrain based on the dissolved load of the saturated organic materials. The terrain type referred to as fen had a higher activity of Na, Cl, and Ca, a higher pH value, and a lower concentration of oxygen than the bog terrain type. These results are explained with reference to organic terrain morphology and the distribu...

In situ measurement of dissolved materials as an indicator of organic terrain type

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In situ measurement of dissolved materials as an indicator of organic terrain type