In which regions are Korean pine (Pinus koraiensis) tree species mainly distributed?
The distribution area of the Korean pine (Pinus koraiensis) tree species is: Korean pine is produced in the mountainous areas of Heilongjiang, Jilin and Liaoning in China at altitudes of 300 to 1800 m. Its natural distribution roughly coincides with the range extending from the Changbai Mountains and the Greater Khingan Mountains. It has been introduced and cultivated in Beijing and in such places in Shandong as Mount Tai, Mount Lao and Mount Kunlun. Korean pine has a fairly wide tolerance for light conditions, and as the tree age increases, its light requirement gradually rises. It most prefers deep, fertile mountain dark brown forest soil with good permeability. Korean pine is a shallow-rooted tree species, its taproot is not well developed, and its lateral roots spread very widely horizontally, which helps it absorb soil nutrients. In addition, Korean pine is quite sensitive to humidity. In its distribution area, the annual precipitation is 500 to 1200 mm; it grows well when the humidity index reaches 0.7 or above, and often grows poorly when it is below 0.5.