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American sweetgum (Liquidambar styraciflua), also known as American storax, [3] hazel pine, [4] bilsted, [5] redgum, [3] satin-walnut, [3] star-leaved gum, [5] alligatorwood, [3] gumball tree, [6] or simply sweetgum, [3] [7] is a deciduous tree in the genus Liquidambar native to warm temperate areas of eastern North America and tropical montane regions of Mexico and Central America.
The American sweetgum is widely planted as an ornamental, within its natural range and elsewhere. The hardened sap, or gum resin, excreted from the wounds of the sweetgum, for example, the American sweetgum ( Liquidambar styraciflua ), can be chewed on like chewing gum and has been long used for this purpose in the Southern United States . [ 4 ]
Liquidambar acalycina, Chang's sweetgum, is a species of flowering plant in the family Altingiaceae native to southern China. Growing to 30–50 ft (9.1–15.2 m) tall and 20–30 ft (6.1–9.1 m) broad.
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A gap-graded soil is a soil that has an excess or deficiency of certain particle sizes or a soil that has at least one particle size missing. [1] [3] An example of a gap-graded soil is one in which sand of the no. 10 and no. 40 sizes are missing, and all the other sizes are present. [3]
Oriental sweet gum trees favour an elevation of between 0–400 m (0–1,312 ft), a mean annual rainfall of 1,000–1,200 mm (39–47 in) and a mean annual temperature of 18 °C (64 °F). The tree's optimal growth is on rich, deep and moist soils such as bogs, river banks and coastal areas, but it is also able to grow on slopes and dry soil.
Liquidambar formosana is a large, native, deciduous tree that grows up to 30-40m tall. The leaves are 10~15 cm wide, [4] and are three-lobed unlike five- to seven-lobed leaves of most American Liquidambar species. [5]
The plasticity index is the size of the range of water contents where the soil exhibits plastic properties. The PI is the difference between the liquid and plastic limits (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a PI of 0 (non-plastic) tend to have little or no silt or clay.