Analyses on propagation system of Japanese stone pine (Pinus pumila) with synchronization of annual shoot elongation among shoots

Abstract

Propagation system of Pinus pumila was analyzed to clarify a relation between seed propagation and vegetative propagation, both have been considered for the species, with analyses of synchronization in pattern of annual shoot elongation (PYS) among main shoots. PYSs were measured in 1991 and '92 at 70 communities on 9 mountains. 45 correlation coefficients of PYS among 10 shoots in a plot were calculated. Similarity of PYSs among shoots in each plot was summarized by ratio of number of significant coefficients to the 45 coefficients (RSC). In the frequency distribution for number of plots to RSC, they were clarified that mode rank is 25〜35% of RSC, there are some plots showing higher RSC than 75%, and frequency decreases gradually from mode to higher RSC rank. Many RSCs in other species stands were calculated. Stands showed high RSC same to higher RSC in the pine were 6 stands made by clonal seedlings (60〜98%RSC) and a stand made by seedlings from seeds being in brother or semi-brother relation (73〜96%RSC). Stands showed low RSC near to the mode RSC of the pine were 5 stands made by seedlings from open pollinated seeds (39・24・7〜13・14・4%RSC). It was concluded that the vegetative propagation occures with high probability in a community locating in site where soil is deep. As the results, relation between seed propagation and vegetative propagation was clarified as follows. Namely, early development of community occures by seed propagation with synzoochory and development of community occures by both propagation systems. Especially, occurrence of vegetative propagation is affected by site condition as inclination of slope, depth of soil, and existence of rock in the ground.