THE HABITAT CONDITION ANALYSIS OF LUEHDORFIA JAPONICA, THE SIMBOL OF CONSERVATION AREA

It has been pointed out that the vegetation succession brings out the reduction of the Luehdorfia japonica. But some researcher has insisted that thinning cannot increase the population of the butterfly. Then we cut down half of the forest and reverse succession, in order to study the influence of the population of Asarum rigescens var. brachypodion, larval food plant, and the mass of reward of the butterfly by cut off the forest. It was being thought that thinning in a forest obstructed growth of forest floor plant, but the growth of A. rigescens that was famous of forest floor plants, was promoted. On the other hand, A. rigescens did not grow up in the climax forest despite of survive. In the green house experiment we can get the proof of the growth condition. The growth of open light condition was superior to that of the 40% light penetration condition. And more the number of flowering of plants was more increased than ever. It was indicated that the thinning in a forest is important for the habitat of the symbolic butterfly, L. japonica, and it increased other plants bloom, and to secure source of nutrition of much insect kinds.