It is believed that the township forests have been preserved as such since ancient times. Therefore, its forest vegetation is considered to have preserved the original
vegetation of the area, the so-called
original vegetation. Today, when the surrounding nature is often destroyed, township forests are often one of the few clues to the former nature of the area. For this reason, in
Forest ecology in
Japan, the township forests are emphasized, called
shrine forests or
shrine and temple forests, and are often the subject of surveys. In many cases, they are confirmed to be valuable in the process and are protected as
natural monuments or the like. In this sense, the forests associated with
Utaki in
Okinawa are similar. However, it should not be assumed that the original vegetation has been fully preserved. When surrounding areas are developed and only the chinju forest remains isolated, what was once a broad, continuous ecosystem becomes fragmented into smaller sections. As a result, the overall habitat area is reduced, and some species may no longer be able to sustain viable
population . The topography of the area may not include areas along mountain streams, and many areas will be lost from the communities that existed in ancient times. This will also cause aridification and other changes. Some areas are changed by such changes, and some species are newly invaded. For example,
camphora, which is often seen in shrines, is not thought to have originally been found in the forests of central and southern Japan. Also,
deciduous trees such as
Keyaki and
Mucunoki should not occur much in the
climax community south of the plains in central
Honshu. Furthermore, in such fragmented vegetation, the
animals that live there often do not have enough room to move around to maintain their populations, and the animal communities are thought to be more degraded than the plant communities. Since many plants require specific animals for
pollen vectoring,
seed dispersal, etc., it can be said that the degradation of animal communities is related to the transformation of the vegetation itself in various ways. Direct human disturbance also takes place. Often, non-wild plants are planted in the precincts. Also, when a tree falls in the forest, the gap created by the fall (in ecological terms
gap) is often filled by planting
cedar or
cypress. There are reports of advanced use of forest resources in the precincts as early as the early modern period.。In recent years, some forests have been undercut and raked for leaves, but this kind of maintenance is not necessary, and if done in natural forests, it can lead to increased devastation. In addition, forests are often cut off from their surroundings or mowed around them due to road expansions, etc. In such cases, the forests are often destroyed by clumps or mantle communities. In such cases, forests that have lost their mantle and sod communities are prone to drying out of the forest floor, which can lead to devastation. In addition, concrete spraying is increasingly used for restoration of these areas, which is an easy and inexpensive method that does not allow for natural recovery. Nevertheless, unlike so-called
satoyamas, these forests are familiar to people, but they are treated differently from forests that are tended to for human use, and they continue to have a certain presence. == Decline ==