The Potency of Ulin (Eusideroxylon zwageri T. et. B) for Supporting Banjarese Building Construction in “Wetland Architecture”

Environmental condition of around rivers and swamps causes the Banjarese people to build settlements use ulin ( Eusideroxylon zwageri T. et. B.).  Using ulin has become their culture, because they believe the building will be stronger.  In fact the potential ulin from year to year continues to decline, because the growth is not proportional to the speed of ulin needs for construction, thus it is becoming scarce.  This research was conducted in Kabupaten Tanah Laut and Kabupaten Kotabaru.  The method used survey with purposive sampling (large of sample plot 100 m x 100 m which each plot divided into 25 sub-plots of 20 m x 20 m).  All growth stages of ulin were inventoried and in each plot found ulin measured micro climate and collected sample of soil.  Normally ulin can grow well on un-fertile soil, but micro climate like primary forest or old secondary forest. Potential ulin in both Kabupaten per hectare is very low.  The amount of natural regenerations ranged from 3-5 individuals/ha for seedling and 3-46 individuals/ha for sapling.  Number of poles found in both locations are ranged 5 – 6 individuals/ha, and not found tree stage.  Restrictions on harvesting and conservation of ulin are urgently needed in South Kalimantan