Distribution of the Genetic Resource and the Biomass of Root Bark of Ulmaceae Species

Abstract

Stem and root of elm trees have used as traditional medical materials, but there is littleinformation on the distribution and resources of habitats. Korean native growing Ulmus spp. (U. davidiana var. Japonica, U. parvifolia, U. davidiana, and U. macrocarpa) genetic resourcesstudied through The National Forest Inventory of Korea data and field survey. The distributions ofU. davidiana var. japonica according to elevation distributed evenly. Both U. parvifolia and U. davidiana were inhabited mostly at less than 200 m of altitude. Each Ulmaceae species widelywere distributed nationwide, but a dominant species was different depending on locals. It observedthat Ulmaceae inhabits mainly in steep slopes of 31-45 degrees. Most of the habitats regeneratedby natural seeding and the most abundant species were a codominant tree. Distribution of trees inU davidiana var. japonica was 7 m-13 m, and in young U. parvifolia and U. macrocarpa, morethan 25% of young trees less than 7 m observed. The distribution of the diameter of breastheight of the U. davidiana var. japonica was 46.4% for 11-20 cm, 52.6% for 11-20 cm in U. parvifolia. The average T/R ratio was 0.83, and the mean weight ratio of root bark was 62%. Asthe results of this study, the domestic Ulmaceae biomassare very small. It is difficult to harvestin that the habitat on the slope. Thus, it is too hard to develop functional materials using biomassat present. Therefore, it is necessary to develop technology for the selection and propagation ofelite trees of Ulmaceae.