SEASONAL pH FLUCTUATIONS IN A GREY WOODED SOIL

1958 ◽  
Vol 38 (2) ◽  
pp. 130-135 ◽  
Author(s):  
W. E. Bowser ◽  
J. N. Leat
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Temperature Regime ◽  
Soil Samples ◽  
Seasonal Fluctuations ◽  
Ph Values ◽  
Soil Temperature Regime ◽  
Ph Fluctuations

Seasonal fluctuations in pH values were determined on soil samples from a modal Grey Wooded soil (Cooking Lake series). Samples were collected from the A0, A2, and B1 horizons at regular intervals from May to November. During this period the pH of each horizon varied from neutral to strongly acid. These fluctuations appeared to be related to the soil moisture and possibly to the soil temperature regime.

scholarly journals Soil temperature study in Puerto Rico

1969 ◽  
Vol 93 (3-4) ◽  
pp. 149-171
Author(s):  
Jorge L. Lugo-Camacho ◽  
Miguel A. Muñoz ◽  
Juan Pérez-Bolívar ◽  
Gregory R. Brannon
Keyword(s):  
Puerto Rico ◽  
Soil Moisture ◽  
Soil Temperature ◽  
Sea Level ◽  
Air Temperature ◽  
Temperature Regime ◽  
Soil Series ◽  
Soil Temperature Regime ◽  
The Mean ◽  
Mean Annual Air Temperature

Soil temperature measurements from a climate monitoring network in Puerto Rico were evaluated and the difference between mean summer and mean winter soil temperature, known as isotivity value, was calculated. Air and soil temperature was collected from five weather stations of the USDA-Natural Resources Conservation Service from sea level to 1,019 m above sea level and from different soil moisture regimes. Isotivity values ranged from 1.2 to 3.9° C with an average of 2.6° C. The 750-m elevation was identified as the limit between the isohyperthermic and isothermic soil temperature regimes in the perudic soil moisture regime in Puerto Rico. The greatest differences between mean annual soil temperature and mean annual air temperature were observed at Guánica, Combate and Guilarte (2.1 ° C) stations. The smallest differences were observed at Maricao (0.8° C) and Isabela (1.8° C) stations. The study also indicated that the mean annual soil temperature in Puerto Rico can be estimated by adding 1.8° C to the mean annual air temperature or by the equation y = -0.007x + 28.0° C. The equation indicates that 97 percent of the time the behavior of the mean annual soil temperature is a function of elevation. According to the updated soil temperature regime boundaries, eight soil series were established in the Soil Survey of San Germán Area. In an area under the isothermic soil temperature regime, four soil series were classified as Oxisols (Haploperox), two soil series as Inceptisols (Eutrudepts) and two soil series as Mollisols (Argiudolls). This is the first field recognition of the Haploperox soil great group in the United States and its territories.

scholarly journals Soil temperature and soil moisture characteristics for several habitat types of Montana and Idaho

1996 ◽  
Author(s):  
◽  
Dean Albert Sirucek ◽  
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Temperature Regime ◽  
Western Montana ◽  
Thuja Plicata ◽  
Habitat Types ◽  
Soil Temperature Regime ◽  
Northern Idaho ◽  
Moisture Conditions ◽  
Climax Forest

Soil temperature and soil moisture data from sixty-six monitoring sites located in forest ecosystems of western Montana and northern Idaho were summarized. These data were analyzed in comparison to the criteria for soil temperature and soil moisture regimes (U.S.D.A.- Soil Taxonomy, Soils Staff, 1975). The hypothesis that climax forest communities (habitat types) occupy sites with characteristic soil temperature and moisture conditions was tested. The soil temperature and soil moisture status throughout the growing season for fifty-two monitoring sites was analyzed in respect to their climax forest series and habitat type class. The results of the analysis demonstrate that some forest habitat types of northern Idaho and western Montana occupy sites with a narrow range of soil temperature and soil moisture conditions; where as other habitat types have variable soil temperature and soil moisture conditions. The monitored soil temperature and soil moisture data were displayed for nineteen forest habitat types. Several relationships between climax forest vegetation, soil temperature regimes and soil moisture regimes were identified, for western Montana and northern Idaho. The Abies Iasiocarpa climax forest series monitoring sites classify primarily in the cryic soil temperature regime. The Thuja plicata, Abies grandis, and Pseudotsuga menziesii climax forest series monitoring sites classify primarily in the frigid soil temperature regime. In western Montana all the Abies lasiocarpa, Thuja plicata, and Abies grandis climax forest series monitoring sites classify in the udic soil moisture regime. The Pseudotsuga menziesii climax forest series monitoring sites classify in either a udic or a xeric soil moisture regime. It was concluded that a field soil scientist in western Montana or northern Idaho could estimate the soil temperature regime by knowing the climax forest series and elevation of a site. Discriminant analysis was applied to thirty-four monitoring sites representing six habitat types. The probability of the membership in a habitat type being correctly predicted by the site characteristics alone (i.e. average soil temperature, average soil moisture tension, and elevation) was eighty-six percent.

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