Moskal, Leskiw, Naeth and Chanasyk (2001) Effect of organic carbon (peat) on moisture retention of peat : mineral mixes

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Effect of organic carbon (peat) on moisture retention of peat : mineral mixes

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CONTRIBUTORS:

	Author:	Moskal, T D
	Author:	Leskiw, L
	Author:	Naeth, M A (University of Alberta)
	Author:	Chanasyk, D S (University of Alberta)

JOURNAL:

Canadian journal of soil science, 81(2), 205 - 211.

YEAR:

2001

PUB TYPE:

Journal Article

SUBJECT(S):

peat, soil amendment, organic carbon, soil moisture, oil sands tailings

DISCIPLINE:

Ecology

HTTP:

LANGUAGE:

English

PUB ID:

103-396-538 (Last edited on 2003/11/10 19:20:15 US/Mountain)

SPONSOR(S):

ABSTRACT:
Quantification of the effects of organic carbon (OC) addition to reclaimed soils is an important reclamation issue. Such effects on soil texture, field capacity (FC), wilting point (PWP) and water-holding capacity (WHC), all expressed both on a gravimetric and volumetric basis, were quantified using both in situ soil samples and laboratory-prepared peat:mineral mixes. Soil samples were collected from both natural and reclaimed areas within the Oil Sands region of Alberta; pear was obtained from the same area. Organic carbon was determined for laboratory-created mixtures and expressed as volume ratios; for the in situ samples it was expressed as % OC. Bulk density, an important factor in the effects of OC on water retention, was measured in situ. Water retention parameters of in situ samples on a gravimetric basis were significantly related to % OC, but those on a volume basis were not. Trends in volumetric WHC for in situ, coarse-textured samples were similar to those for gravimeteric WHC, due to similar bulk densities ranging from 1.30 to 1.40 Mg m(-3). However, for in situ peaty soils, trends in volumetric water retention did not mimic those expressed on a gravimetric basis due to low and irregular bulk densities. For laboratory-constructed peat:mineral mixes, FC and WHC were significantly impacted by % OC, however, PWP was not. The addition of peat material resulted in minor textural changes for sand and loamy sand; hence, the change in texture could not be responsible for the increases in WHC as the result of peat additions. The results for sandy loam were variable.

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