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Juniperus morrisonicola Hay.
negative exponential function
Juniperus morrisonicola (juniper tree) forest community at Cuei-Chih Area in Mt. Shye of Taiwan, according to physiognomy and composition it can be divided into 3 categories of sites as following arbor forest, ecotone between J. morrisonicola and Abies kawakamii, and krummholz. In this paper, the class of diameter at breast height (DBH) of J. morrisonicola and A. kawakamii in the sample plots were surveyed. The results showed that the diameter distributions of trees including J. morrisonicola and A. kawakamii at arbor forest and ecotone sites were exhibited as inverse J-shaped. According to DBH size, both of J. morrisonicola individuals at arbor forest and econtone sites can be divided into 3 growth stages that were as early stage (ES), middle stage (MS) and late stage (LS) respectively. Here we can see a trend in diminished rate of these 3 growth stages, as highest diminished rate in ES, followed by LS and MS. The slope of simple regression of the density-diameter distribution on the Semi-log graph can be revealed the decreasing rate at different growth stages. It reflected the phenomenon of asymmetric U-shaped mortality in the J. morrisonicola forest stand and also suggested J. morrisonicola were the dominant species with long longevity at this area. All of results provide new information for further forest dynamic researches in the future.
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