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Global variation in soil pH. Red = acidic soil. Yellow = neutral soil. Blue = alkaline soil. Black = no data. Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics.
Acidification from leaf litter on the O-horizon is more pronounced under coniferous trees such as pine, spruce and fir, which return fewer base cations to the soil, rather than under deciduous trees; however, soil pH differences attributed to vegetation often preexisted that vegetation, and help select for species which tolerate them. Calcium ...
Water with excess H 3 O + ions is called acid (pH < 7), and water with excess OH – ions is called alkaline or rather basic (pH > 7). Soil moisture with pH < 4 is called very acid and with pH > 10 very alkaline (basic). H 2 CO 3 (carbonic acid) is unstable and produces H 2 O (water) and CO 2 (carbon dioxide gas, escaping into the atmosphere).
The term "sodic soil" is sometimes used imprecisely in scholarship. It's been used interchangeably with the term alkali soil, which is used in two meanings: 1) a soil with a pH greater than 8.2, 2) soil with an exchangeable sodium content above 15% of exchange capacity. The term "alkali soil" is often, but not always, used for soils that meet ...
Most plants are sensitive to soil pH levels (acidic, neutral, or alkaline) and many species will only grow in areas with a specific soil type. [ 6 ] [ 11 ] Claude A. McLeod's study stated that the Big Thicket was "an edaphicmesophytic climax forest" – edaphic , meaning the soil is a greater influence on the plants than the climate, and ...
In the western United States, pinyon pines are often found in pinyon–juniper woodlands. Pinyon wood, especially when burned, has a distinctive fragrance, making it a common wood to burn in chimeneas. [2] Pinyon pine trees are also known to influence the soil in which they grow by increasing concentrations of both macronutrients and ...
Cypress trees are extremely sensitive to pH and prefer more acidic soils. Decaying pine stumps have a lower pH than surrounding soils, it is believed that this is the main factor influencing the increased prevalence of cypress seedlings. [3] Analysis of evapotranspiration on pine and cypress wetlands found that both tree types are sensitive to ...
The trees grow in soils that are shallow lithosols, usually derived from dolomite and sometimes limestone, and occasionally sandstone or quartzite soils. Dolomitic soils are alkaline, high in calcium and magnesium, and low in phosphorus. Those factors tend to exclude other plant species, allowing bristlecones to thrive. [9]