9 research outputs found
Phenological Investigations on External Morphological Development and Growth of Japanese Larch Strobili and Cones : Fundamental Studies for Crossing of Larches, 1
In order to obtain fundamental knowledge of the male and female strobili and cones, various investigations were carried out on Japanese larch at Yamabe, Hokkaido, on the basis of the criteria previously determined for each of their characters from the point of view of the reproductive phenology. Measurement of size and weight were regularly maintained. The results of these investigations are shown together with a common axis of abscissa marked with calendric time in a figure, and those of the measurements in another (Figs. 2 and 3). Collective consideration on them gives a well-defined image to the reproductive cycle of this species in Hokkaido. This cycle shown as a circular calendar (Fig. 4) can be divided into several characteristic periods, and serves as a guide for undertaking breeding in the natural conditions.ã«ã©ããé¡äº€éã®ããã®åºç€çãªç 究ã®äžã€ãšããŠïŒã«ã©ããã®è±éšã®å£ç¯çææçãªçºè²éçšã調ã¹ãã調æ»èŠ³å¯ã¯ïŒæ±äº¬å€§åŠåæµ·éæŒç¿æå±±éšèçå
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In order to obtain fundamental knowledge of the male and female strobili and cones, various investigations were carried out on Japanese larch at Yamabe, Hokkaido, on the basis of the criteria previously determined for each of their characters from the point of view of the reproductive phenology. Measurement of size and weight were regularly maintained. The results of these investigations are shown together with a common axis of abscissa marked with calendric time in a figure, and those of the measurements in another (Figs. 2 and 3). Collective consideration on them gives a well-defined image to the reproductive cycle of this species in Hokkaido. This cycle shown as a circular calendar (Fig. 4) can be divided into several characteristic periods, and serves as a guide for undertaking breeding in the natural conditions.ã«ã©ããé¡äº€éã®ããã®åºç€çãªç 究ã®äžã€ãšããŠïŒã«ã©ããã®è±éšã®å£ç¯çææçãªçºè²éçšã調ã¹ãã調æ»èŠ³å¯ã¯ïŒæ±äº¬å€§åŠåæµ·éæŒç¿æå±±éšèçå
ã®çè±ä¿é²è©Šéšäžã®æ€æ œæšã1968幎ã«å€éã®çè±ãçããã®ã§ïŒãã®ãã¡ã®1æ¬ã察象ã«ïŒ4æåãããç¿å¹Ž1æãŸã§ç¶ããããã圢質ããšã«ïŒåŸæ¥çšããããŠããïŒãããã¯æ°ãã«æ±ºããïŒæ¹æ³ã«ãã£ãŠè¡šç€ºãïŒ1å³ã«ãŸãšããŠçžäºã®éã®æéçãªé¢ä¿ãã¿ãããããã«ããïŒFig. 2ïŒããŸãïŒå€§ããïŒéãçã®èšæž¬ã§ããäžéšã®åœ¢è³ªã«ã€ããŠããã®æéçãªå€åã調ã¹ãïŒFig. 3ïŒTableïŒã以äžã®çµæãç¶åããŠïŒã«ã©ããã®çæ®çãµã€ã¯ã«ãããã€ãã®æéïŒæ®µéïŒã«åºåãããšãã§ãããããã§ã¯ïŒãã®åæéãäžã€ã®ååšäžã«é
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Introduction Trial of Three Abies Species Native to Honshu into Hokkaido : On the Growth of Their Nursery Stocks
Seed lots of the following three species of Abies native to Honshu were raised for a new trial of introduction at the nursery of the Tokyo University Forest in Hokkaido, Yamabe, Furano: A. homolepis (H), A. mariesii (M) and A. veitchii (V) (Table 1). A few provenances or mother trees were chosen for each species, referring to the results of preliminary trials2ïœ4). Observations and measurements were made on the growth (height and diameter), the period of opening of buds, the formation of lammas shoots, the extent of injury by late frosts, and the mortality, in their nursery stage (Table 2). The main parts of the results obtained may be summarized as follows
Studies on Hybrid Frequencies of the Interspecific Crossing between Dahurian Larch and Japanese Larch
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ã®éçš®èãå«ãã§ãããIt is well known that the hybrid ratio, which here means a frequency of hybrid seedlings within any progeny family, of a progeny produced by open-pollination of Kurile larch (sometimes replaced by Saghalien larch) and Japanese larch greatly varies with years, sites and/or trees. A series of surveys and experiments through artificial pollination carried out in search of main causes and related factors, which affect or determine this phenomenon, have made clear the following facts
Morphological and Habitual Characteristics of Natural Hybrids between Saghalien Spruce (Picea glehnii) and Yezo Spruce (P. jezoensis)
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The Influence of Large-sized Wheel-type Forestry Machines on the Residual Forest Land : A case study of selection cutting operations on a natural forest in Hokkaido
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èŠããããA continuous research program into the influence of selection cutting and whole tree logging using a feller buncher and a grapple skidder on forest land, residual trees, natural regeneration and vegetation has been carried out over four years after cutting in a natural forest in Hokkaido. The results obtained were as follows: 1) 54% of the residual trees suffered from some damage and 56% of the surface of the forest land was disturbed. 2) In the case of small trees, the probability of fatal damage was high. Middle or large trees were damaged partially. 3) The closer to the felled tree, the higher the probability of damage. 4) The volume of healthy trees was only 14% of the stand volume before cutting, 30% of the stand volume was dead or declining because of logging damage. 5) The surface idsturbance by logging is expected to allow the natural regeneration of Betula ermanii, but it is not sufficient to ensure a coniferous succession. Accordingly, in case of selection cutting operations and whole tree logging using a large-sized wheel-type forestry machine, the influence is too severe on the residual stands. In particular, coniferous trees declined and in the future the forest will be an open forest covered with broad-leaved tress. The natural regeneration of conifers is not expected in spite of surface disturbance by logging because of the quick recovery of Sasa senanensis. So artificial planting of succeeding trees is needed for sustainable forest management. In order to promote the mechanization of logging operations, improvements in the routes of machine movement and the method of tree felling considering residual trees are indispensable
Long-term phenology data on woody plants at The University of Tokyo Hokkaido Forest from 1930 to 2010
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¬è¡šãããThe number of long-term datasets available for research into climate change is limited because global warming has only been a major research subject since the 1980s. The University of Tokyo Hokkaido Forest (UTHF) has accumulated phenology data of woody plants since 1930. However, researchers outside the UTHF have not been able to utilize these valuable long-term data because only analyzed data have been published, with the exception of the first 8 years when original data were published. Also, it is even difficult for researchers at the UTHF to use these data because the continuity of the time-series is not clear and because the original data for the 13 years from 1938 to 1950 was lost. In this paper, the continuity of the long-term time-series data was clarified by organizing observed events, observed species and individuals, the number of individual trees for each species, and observers, which have been frequently changed. We have tried to publish the original numerical data (=dates) for all the individual trees that have been observed