Plant Leaves Left On Soil
Many plants produce organic acids. Where plant litter accumulates on or is incorporated to the soil, these acids (including acetic acid, humic acid (see http://www.suprahumic.unina.it/), oxalic acid, and tannic acid) are liberated. This is especially acute in soils under coniferous trees such as pine, spruce and fir, which return fewer base cations to the soil than do most deciduous trees.
Read more about this topic: Soil Acidification
Famous quotes containing the words plant, leaves, left and/or soil:
“The student of Nature wonders the more and is astonished the less, the more conversant he becomes with her operations; but of all the perennial miracles she offers to his inspection, perhaps the most worthy of admiration is the development of a plant or of an animal from its embryo.”
—Thomas Henry Huxley (1825–95)
“We say ourselves fortunate to be driving by today.
That we may look at them, in their gardens where
The summer ripeness rots. But not raggedly.
Even the leaves fall down in lovelier patterns here.”
—Gwendolyn Brooks (b. 1917)
“We carved not a line, and we raised not a stone,
But we left him alone with his glory.”
—Charles Wolfe (1791–1823)
“But the nomads were the terror of all those whom the soil or the advantages of the market had induced to build towns. Agriculture therefore was a religious injunction, because of the perils of the state from nomadism.”
—Ralph Waldo Emerson (1803–1882)