Ironwood tree as one of the original vegetation, known as the Borneo ironwood, now increasingly rare. In fact, in South Kalimantan is expected to ulin population only 20 percent.
Plants that can reach a height of 35 meters it increasingly difficult to obtain in the forest. Ironwood tree is the main raw materials to make houses for the people of Borneo who live in swamp areas and waters.
Sudin Panjaitan, researchers Silviculture Division of Research and Development (Research and Development) Forestry Research Institute of Forestry Banjarbaru, South Kalimantan, said, populations ulin (Eusideroxylon zwageri) in Kalimantan, South Kalimantan in particular, is expected to live 20 percent compared with the condition 40 years ago.
"Logging ironwood uncontrollably accelerate extinction. Now to find a tree 20 centimeters in diameter ulin difficult. When a tree 10 cm in diameter have been cut down to them," he said on Friday (9 / 4) in Banjarbaru, South Kalimantan.
According to Sudin, ulin population as a whole difficult to quantify because these trees grow together with other types of trees as a companion, such as meranti. Ulin, including trees that are difficult to grow in the open.
In South Kalimantan, ironwood can still be found in several places, among others in the area acids, Tanahlaut District, Watershed District Riamkanan in Banjar, Kotabaru District, and along the Mount Meratus. On one hectare of land is usually only found dozens of ironwood trees.
Ulin, according to Sudin, is a slow growing vegetation. Within one year, the tree diameter is less than 1 cm. This is different from meranti which could reach 1.5 to 2 cm. At the age of 40 years to reach 36 cm in diameter ulin. New at the age of 100 years could be 50 cm in diameter ulin.
"Due to slow progress, there is rarely a developing society. Moreover, HPH (forest management rights). They seldom are willing to cultivate, because it can be used to take long," said Sudin.
Banjarbaru Forestry Research and currently has 1,000 hectares of land research at the Forest Area Special Purpose (KHDTK) in the area Kintab, Tanahlaut District. In that place there ironwood, meranti, and a number of other trees.
On separate occasions in Banjarmasin, South Kalimantan Forestry Dept. Atmoredjo Suhardi said it would promote the operation against illegal logging in the region on the border of the Mount Tagah Banjar and Tanahlaut. Allegedly the loggers led to the area because it is still quite a lot ulin