Methods of pH Determination and Seasonal pH Fluctuations in Quebec Forest Humus

Vezina, Paul E.

doi:10.2307/1935022

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…It may be misleading, whose filaments disperse readily in water, however, to relate certain microorganisms to whereas Bristol Roach (3) obtained counts of specific pH values of forest soils because of only 30/g in a soil having a visible surface large sampling errors and seasonal fluctuagrowth of other filame~ltous species. In this tions in microhabitat acidity (19). Also, on latter situation each colony likely developed bare areas such as the nursery plots, soil pH from a large number of trichomes, each determinations of bulk samples may not extrichome containing hundreds of cells.…”

Section: Nitrogen-$xing Algal Species Presentmentioning

confidence: 99%

Nitrogen-fixing blue-green algae in acid forest and nursery soils

Jürgensen¹,

Davey²

1968

Can. J. Microbiol.

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Algal populations were studied in soils from sites representing several major forest types ranging from the spruce–fir forests in the Appalachian Mountains to the Southern pine forests along the Atlantic Coast. In addition, the nitrogen-fixing blue-green algal population of a forest tree nursery was examined.The results of this investigation indicate a general lack of nitrogen-fixing algae in acid forest soils. However, a pronounced development of these algae was observed in the acid nursery soil, especially on the soil surface. Low numbers of algae were found in some forest soils but only when the soil was above pH 5.4. No nitrogen-fixing Cyanophyceae were isolated from soils in the Appalachian Mountains regardless of soil acidity. Nostoc muscorum was the most common nitrogen-fixing species occurring under both forest and nursery conditions. Nostoc commune was isolated only from the nursery soil. Several strains of Nostoc ellipsosporum were obtained from a mixed hardwood–softwood site. An examination of the algal flora of a number of Alaskan tundra soils gave results similar to those found in the forest soils.

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Section: Nitrogen-$xing Algal Species Presentmentioning

confidence: 99%

Nitrogen-fixing blue-green algae in acid forest and nursery soils

Jürgensen¹,

Davey²

1968

Can. J. Microbiol.

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“…Seasonal variations of 1.1 to 1.3 units were observed in all soil types tested. Humus pH was the highest in midsummer and decreased with the approach of winter (Vezina 1965). Our research shows seasonal fluctuations in topsoil pH for all green spaces.…”

Section: Seasonal Ph Fluctuationsmentioning

confidence: 53%

“…These are challenging environmental factors city planners need to consider for healthy tree growth in urban green spaces. In addition, poor site condition, artificial ecosystem and a lack of professional tree care may also create unhealthy growing conditions for trees in urban areas (Vezina 1965, Bradshaw et al 1995. Thus, these conditions combined with other external modifications influence tree growth and other key processes.Soil pH is one of the most important properties involved in plant growth (Foth 1990).…”

mentioning

confidence: 99%

Impact of urban green spaces, native tree species and seasons on soil pH in Kaunas, Lithuania

Straigytė¹,

Vaidelys²,

Žalkauskas³

et al. 2019

BALT FOR

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Tree growth is sensitive to soil pH in urban areas and is often higher than in rural forest. However, there are knowledge gaps on how soil pH and alkalization are affected by urban environments and seasonal climate as well as the cascading effects on tree species. In order to fulfill these gaps, we analyzed the soil pHCaCl of four common native deciduous tree species: Acer platanoides, Tilia cordata, Quercus robur and Betula pendula in five different types of urban green spaces in Kaunas city municipality (Lithuania). The results show that soil pH in urban environments with Betula pendula sites were most alkaline (pH 7.04), whereas the soil pH of urban environments with Acer platanoides (pH 6.7) and Tilia cordata (pH 6.8) were most acidic. The soil pH of street tree greeneries was alkaline, while soils of peri-urban forests and large urban parks were acidic. Differently to natural conditions in peri urban forests the soil pH level drop down by 0.5 is observed during spring-autumn period in broad street greeneries with largest urban pressure. The variation in soil pH of the different types of green space and tree species shows that city planner should consider the unique conditions of all green space to maximize their potential for human well-being.

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“…However, seasonal fluctuations of soil pH have been noted (Smith and Robertson 1931;Huberty and Haas 1940;Bowser and Leat 1958;Vezina 1965;Haavisto 1969). In acidic peat, the greater the ratio of water to soil, the higher is its apparent pH.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these difficulties, a standard salt solution could be used (Schofield and Taylor 1955;Russell 196l;Schachtschabel 1971 (Rowe 1959). At the clpsest climatological station (Montreal River), the annual average temperature is 36.4 F (2.3 C) and the annual average precipitation 33.9 inches (86.1 cm) (Anonymous 1964(Anonymous , 1965 (Vezina 1965;Schachtschabel 1971 (3) to (6).…”

Section: Introductionmentioning

confidence: 99%

COMPARISONS OF METHODS OF pH DETERMINATION FOR ORGANIC TERRAIN SURVEYS

Stanek¹

1973

Can. J. Soil. Sci.

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pH values were measured on peat samples taken from a water-logged peatland in Ontario, from April 1970 to April 1971, by 14 procedures: on fresh peat and groundwater, in their natural state; and on combinations of hand-squeezed, air-dried, and oven-dried peat, each rewetted to liquid limit with either distilled H2O, N/100 CaCl2∙2H2O, N/10 KCl, or N/10 CaCl2∙2H2O. Groundwater showed the highest mean pH (4.0), followed by hand-squeezed peat rewetted with distilled H2O (3.8), then fresh peat (3.6). In comparison with fresh peat, air and oven drying lowered the mean pH value by 0.1 and 0.2 units, rewetting with N/100 CaCl2∙2H2O, by 0.4; N/10 KCl, by 0.5; and N/10 CaCl2∙2H2O, by 0.6 units approximately. The coefficients of variation and the confidence limits showed, for practical application, that all methods were equally reliable and that pH determined at any time of the year validly characterized a site.

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Methods of pH Determination and Seasonal pH Fluctuations in Quebec Forest Humus

Cited by 7 publications

References 9 publications

Nitrogen-fixing blue-green algae in acid forest and nursery soils

Nitrogen-fixing blue-green algae in acid forest and nursery soils

Impact of urban green spaces, native tree species and seasons on soil pH in Kaunas, Lithuania

COMPARISONS OF METHODS OF pH DETERMINATION FOR ORGANIC TERRAIN SURVEYS

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