VARIATIONS OF pH WITH ANNUAL CUMULATIVE PRECIPITATION IN ACID FOREST SOILS

1980 ◽  
Vol 60 (2) ◽  
pp. 385-387 ◽  
Author(s):  
C. B. CRAMPTON
Keyword(s):  
British Columbia ◽  
Soil Ph ◽  
Forest Soils ◽  
Rain Forest ◽  
Ph Measurements ◽  
Ph Values ◽  
Acid Forest Soils ◽  
Normal Increase ◽  
Cumulative Precipitation

Colorimetric soil pH measurements made systematically across Belcarra Mountain in the rain-forest of British Columbia over the 4-yr period 1975 to 1978 showed summer (June or July) values to increase somewhat with total cumulative precipitation (previous November to July). After dry winters, lower pH values in both A and B horizons were recorded, the increase in acidification being so marked on the sandy Podzols as compared to the less light-textured Brunisols that the normal increase in pH down the profile was reversed. The causes of such variations are discussed along with their significance when characterizing Orthic Humo-Ferric Podzols of the region.

VARIATIONS OF pH WITH ANNUAL PRECIPITATION IN LOAMY FOREST SOILS

1983 ◽  
Vol 63 (2) ◽  
pp. 401-403
Author(s):  
C. B. CHAMPTON
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Soil Ph ◽  
Forest Soils ◽  
Annual Precipitation ◽  
Ph Measurements ◽  
Changing Patterns

Colorimetric soil pH measurements made systematically across Burnaby Mountain in well-drained loamy soils of the rainforest of British Columbia over an 8-yr period from 1974 until 1981 showed that acidification of the subsoil increased after two consecutive drier-than-average years. This changing acidity contrasted with the relatively stable acidity of the subsoil in imperfectly drained soils, regardless of changing patterns of precipitation. Key words: pH, forests, loams, precipitation

scholarly journals Variation in pH Optima of Hydrolytic Enzyme Activities in Tropical Rain Forest Soils

2010 ◽  
Vol 76 (19) ◽  
pp. 6485-6493 ◽  
Author(s):  
Benjamin L. Turner
Keyword(s):  
Soil Ph ◽  
Forest Soils ◽  
Extracellular Enzymes ◽  
Hydrolytic Enzyme ◽  
Hydrolytic Enzymes ◽  
Acidic Ph ◽  
Acidic Soils ◽  
Fluorogenic Substrates ◽  
Ph Values ◽  
Optimum Ph

ABSTRACT Extracellular enzymes synthesized by soil microbes play a central role in the biogeochemical cycling of nutrients in the environment. The pH optima of eight hydrolytic enzymes involved in the cycles of carbon, nitrogen, phosphorus, and sulfur, were assessed in a series of tropical forest soils of contrasting pH values from the Republic of Panama. Assays were conducted using 4-methylumbelliferone-linked fluorogenic substrates in modified universal buffer. Optimum pH values differed markedly among enzymes and soils. Enzymes were grouped into three classes based on their pH optima: (i) enzymes with acidic pH optima that were consistent among soils (cellobiohydrolase, β-xylanase, and arylsulfatase), (ii) enzymes with acidic pH optima that varied systematically with soil pH, with the most acidic pH optima in the most acidic soils (α-glucosidase, β-glucosidase, and N-acetyl-β-glucosaminidase), and (iii) enzymes with an optimum pH in either the acid range or the alkaline range depending on soil pH (phosphomonoesterase and phosphodiesterase). The optimum pH values of phosphomonoesterase were consistent among soils, being 4 to 5 for acid phosphomonoesterase and 10 to 11 for alkaline phosphomonoesterase. In contrast, the optimum pH for phosphodiesterase activity varied systematically with soil pH, with the most acidic pH optima (3.0) in the most acidic soils and the most alkaline pH optima (pH 10) in near-neutral soils. Arylsulfatase activity had a very acidic optimum pH in all soils (pH ≤3.0) irrespective of soil pH. The differences in pH optima may be linked to the origins of the enzymes and/or the degree of stabilization on solid surfaces. The results have important implications for the interpretation of hydrolytic enzyme assays using fluorogenic substrates.

scholarly journals Response of Atmospheric Methane Consumption by Maine Forest Soils to Exogenous Aluminum Salts

2000 ◽  
Vol 66 (9) ◽  
pp. 3674-3679 ◽  
Author(s):  
K. Nanba ◽  
Gary M. King
Keyword(s):  
Soil Ph ◽  
Forest Soils ◽  
Aluminum Chloride ◽  
Atmospheric Methane ◽  
Aluminum Salts ◽  
Methane Consumption ◽  
Ph Values ◽  
Mineral Acids ◽  
Sulfate Salts

ABSTRACT Atmospheric methane consumption by Maine forest soils was inhibited by additions of environmentally relevant levels of aluminum. Aluminum chloride was more inhibitory than nitrate or sulfate salts, but its effect was comparable to that of a chelated form of aluminum. Inhibition could be explained in part by the lower soil pH values which resulted from aluminum addition. However, significantly greater inhibition by aluminum than by mineral acids at equivalent soil pH values indicated that inhibition also resulted from direct effects of aluminum per se. The extent of inhibition by exogenous aluminum increased with increasing methane concentration for soils incubated in vitro. At methane concentrations of >10 ppm, inhibition could be observed when aluminum chloride was added at concentrations as low as 10 nmol g (fresh weight) of soil−1. These results suggest that widespread acidification of soils and aluminum mobilization due to acid precipitation may exacerbate inhibition of atmospheric methane consumption due to changes in other parameters and increase the contribution of methane to global warming.

AN ASSESSMENT OF THE SOIL ACIDITY PROBLEM IN ALBERTA AND NORTHEASTERN BRITISH COLUMBIA

1977 ◽  
Vol 57 (2) ◽  
pp. 157-164 ◽  
Author(s):  
D. C. PENNEY ◽  
M. NYBORG ◽  
P. B. HOYT ◽  
W. A. RICE ◽  
B. SIEMENS ◽  
...  
Keyword(s):  
British Columbia ◽  
Soil Ph ◽  
Soil Acidity ◽  
Field Experiments ◽  
Trifolium Pratense ◽  
Acid Soil ◽  
Acid Soils ◽  
Red Clover ◽  
Hordeum Vulgare L ◽  
Crop Species

The amount of cultivated acid soil in Alberta and northeastern British Columbia was estimated from pH values of farm samples analyzed by the Alberta Soil Testing Laboratory, and the effect of soil acidity on crops was assessed from field experiments on 28 typical acid soils. The field experiments consisted of two cultivars of barley (Hordeum vulgare L.) and one cultivar each of rapeseed (Brassica campestris L.), red clover (Trifolium pratense L.) and alfalfa (Medicago sativa L.) grown with and without lime for 2 yr. There are about 30,000 ha of soils with a pH of 5.0 or less where soil acidity seriously restricts yields of all four crop species. There are approximately 300,000 ha with a soil pH of 5.1–5.5 where liming will on the average increase yields of alfalfa by 100%, yields of barley by 10–15%, and yields of rapeseed and red clover by 5–10%. There are a further 1,600,000 ha where soil pH ranges from 5.6 to 6.0 and liming will increase yields of alfalfa by approximately 50% and yields of barley, rapeseed and red clover by at least 4–5%.

Mineral evolution of acid forest soils in the Strengbach catchment (Vosges mountains, N-E France)

Geoderma ◽  
1998 ◽  
Vol 82 (4) ◽  
pp. 315-340 ◽  
Author(s):  
Jörg Fichter ◽  
Marie-Pierre Turpault ◽  
Etienne Dambrine ◽  
Jacques Ranger
Keyword(s):  
Forest Soils ◽  
Vosges Mountains ◽  
Acid Forest Soils ◽  
Strengbach Catchment

Soil acidity in 1970 and 1989 in a coniferous forest in southwest Finland

1998 ◽  
Vol 78 (3) ◽  
pp. 477-479 ◽  
Author(s):  
C. J. Westman ◽  
S. Jauhiainen
Keyword(s):  
Key Words ◽  
Soil Ph ◽  
Soil Acidity ◽  
Mineral Soil ◽  
Coniferous Forest ◽  
Soil Layers ◽  
Water Suspension ◽  
Ph Values ◽  
Humus Layer ◽  
Repeated Sampling

Forest soil pH in southwest Finland was measured with identical sampling and analysing methods in 1970 and 1989. The acidity of the organic humus layer increased significantly as pH values measured on water and on salt suspensions decreased between the two sampling dates. For the mineral soil layers, no unambiguous trend was found. pH values measured on salt suspension tended to be unchanged or lower, while pH on water suspension in some soil layers were even higher in 1989 than in 1970. Key words: pH, repeated sampling

Models relating soil pH measurements in H2O, KCl and CaCl2 for volcanic ash soils of Cameroon

2018 ◽  
Vol 14 ◽  
pp. e00185 ◽  
Author(s):  
Georges Kogge Kome ◽  
Roger Kogge Enang ◽  
Bernard Palmer Kfuban Yerima ◽  
Meli Gilles Raoul Lontsi
Keyword(s):  
Soil Ph ◽  
Volcanic Ash ◽  
Ph Measurements ◽  
Volcanic Ash Soils

Summary of Coastal Geologic Evidence for past Great Earthquakes at the Cascadia Subduction Zone

1995 ◽  
Vol 11 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Brian F. Atwater ◽  
Alan R. Nelson ◽  
John J. Clague ◽  
Gary A. Carver ◽  
David K. Yamaguchi ◽  
...  
Keyword(s):  
British Columbia ◽  
North America ◽  
Subduction Zone ◽  
Forest Soils ◽  
Pacific Coast ◽  
Cascadia Subduction Zone ◽  
Level Change ◽  
The Past ◽  
The Pacific ◽  
Juan De Fuca

Earthquakes in the past few thousand years have left signs of land-level change, tsunamis, and shaking along the Pacific coast at the Cascadia subduction zone. Sudden lowering of land accounts for many of the buried marsh and forest soils at estuaries between southern British Columbia and northern California. Sand layers on some of these soils imply that tsunamis were triggered by some of the events that lowered the land. Liquefaction features show that inland shaking accompanied sudden coastal subsidence at the Washington-Oregon border about 300 years ago. The combined evidence for subsidence, tsunamis, and shaking shows that earthquakes of magnitude 8 or larger have occurred on the boundary between the overriding North America plate and the downgoing Juan de Fuca and Gorda plates. Intervals between the earthquakes are poorly known because of uncertainties about the number and ages of the earthquakes. Current estimates for individual intervals at specific coastal sites range from a few centuries to about one thousand years.

Solution chemistry in acid forest soils: Are the BC : Al ratios as critical as expected in Switzerland?

2004 ◽  
Vol 167 (2) ◽  
pp. 160-168 ◽  
Author(s):  
Elisabeth Graf Pannatier ◽  
Lorenz Walthert ◽  
Peter Blaser
Keyword(s):  
Forest Soils ◽  
Solution Chemistry ◽  
Acid Forest Soils
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