논문 상세보기
pp.24-31
This study was carried out to analyze cone and seed developmental characteristics of the Pinus densiflora community distributed in the entire area of Mt. Gwanggyo in Suwon. As survey areas, the P. densiflora communities of two regions, which are 400 meters and 550 meters in altitudes above the sea level, were selected, and cone collection was conducted 10 times in total from April 12 to October 11, 2012. The result of cone and seed development survey showed that the size and growth rate of cone and seed was larger and faster in individuals of the community situated at an altitude of 400 meters than those at an altitude of 500 meters. The water content of the cone collected from at an altitude of 400 meters on October 11 was 35.9%, which is 38.3% lower than that of the cone at an altitude of 500m, but more rapid decrease in water was found. The number of cone opening days was 7.3 days in the community at an altitude of 400 meters, and 8.1 days at an altitude of 500 meters, showing that of the cone at an altitude of 400 meters is shorter. The seed separation from the cone showed the same pattern as in the reduction rate from the water content of the inner cone. The number of seeds in the cone and percentage of sound seeds was also greater and higher in th cone at an altitude of 400 meters than that at an altitude of 500 meters. Meanwhile, the maturation of the embryo, a part of seed of the cone between the two communities was observed to be similar to each other. The external size of the seed has hardly changed since July 10th, but the embryo inside the seed was found to be mature until August 7th.
