138 research outputs found
Some notes on the Forest Division of Field Science Center, Tottori University
é³¥å倧åŠèŸ²åŠéšãã£ãŒã«ããµã€ãšã³ã¹ã»ã³ã¿ãŒæ£®æéšéã¯ã2005 幎ã«åŸæ¥ã®æŒç¿æãšèŸ²å Žãå䜵ããŠãã£ãŒã«ããµã€ãšã³ã¹ã»ã³ã¿ãŒãèšç«ãããããšãæ©ã«ãæŒç¿æãšããå称ãæè²ç 究æã«å€æŽããèå±±ã®æ£®ãäžæã®æ£®ã䌯èã®æ£®ãæ¹å±±ã®æ£®ãšããïŒã€ã®æ£®æãæããŠãããããããã®æ£®æã«ã¯ç¹åŸŽããããç 究ãæè²ãå°åè²¢ç®ã«æŽ»çšãããŠãããäžã§ãèå±±ã®æ£®ã«ã¯å®¿æ³æœèšããããåºèæš¹éçºå®éšå®€ã䜵èšãããŠãããèå±±ã®æ£®ã§è¡ãããŠããå±±ã®ç¥ç¥ãéçŽãã«æ¹ç§°ãããããŸã§ã®ãç¥æšã§ãã£ãã¯ããã倧åŸæšãæ¯æ»ããããšãããäºæ¬ç«ã¡ã®ã¹ã®ãæ°ãããç¥æšãšå®ããã䌯èã®æ£®ïŒæ§æºå£æŒç¿æïŒã®å»æ¢ã®å±æ©ãå¥æ©ãšããŠãããããã®æ£®ã®å°åã®åã©ããã¡ã察象ãšãã森ææ宀ãå®æœããããã«ãªã£ãã森ææ宀ã«æŽ»çšããã ãã§ãªãã森æã®åçŽçæ§é ãæš¹æšã®éè±ã»çµå®ãªã©ã®èŠ³å¯ã®ãããé«ã20 mã®æå 芳枬çšãžã£ã³ã°ã«ãžã ã2003 幎5 æã«ã³ãã©äºæ¬¡æå
ã«å»ºèšãããåœæã¯ãžã£ã³ã°ã«ãžã ãšããŠã¯æ¥æ¬ïŒäžçïŒã§ïŒçªç®ã®é«ãã§ãã£ãã倧åŠçãé«æ ¡çã®å®ç¿ã«ã掻çšãããç¹ã«äžåœååœèŸ²åŠç³»åŠçã察象ãšããåäœäºæå®ç¿ã§ããéå±±ãã£ãŒã«ãæŒç¿ã§ã¯å²¡å±±å€§åŠããã³æåªå€§åŠã®æå¡ããã³TA ãšååããŠéé
·ã§ã¯ãããå
å®ããå®ç¿ãç¶ç¶ãããŠãããå°åè²¢ç®äºæ¥ã®äžç°ãšããŠèå±±å°åã§ã®ç«å
¥ãã«ã¯ã森æçæ
系管çåŠç 究宀ã®åŠçã ãã§ãªãåºãåŠçãã©ã³ãã£ã¢ãåããæè¡è·å¡ãšæå¡ãåå ããŠ2005幎ããçŸåšãŸã§ç¡äºã«å®æœããŠãããæè²ç 究æã§ã¯ãæå¡ã ãã§ãªããæè¡è·å¡ãææ¥æèœè£äœå¡ãåŠçãªã©ãååããŠäºæ¥ã®æšé²ããã³ç®¡çéå¶ã«åœãã£ãŠããããããããç 究ãæè²ãå°åè²¢ç®ã ãã§ãªããç°å¢ä¿å
šã®å Žãå
¬ççæ©èœçºæ®ã®å ŽãšããŠéèŠãªåœ¹å²ãæ
ã£ãŠãããšèãããã
Natural Regeneration of Planted Trees : Survival and Growth of Zelkova serrata Seedlings at the Tottori University Campus
Effects of girdling on Black Locust (Robinia pseudoacacia)
é³¥åçé³¥ååžã«äœçœ®ããé³¥å倧åŠèŸ²åŠéšãã£ãŒã«ããµã€ãšã³ã¹ã»ã³ã¿ãŒæè²ç 究æãæ¹å±±ã®æ£®ãïŒä»¥äžãæ¹å±±ã®æ£®ïŒã®ç äžäžã«ã¯ãè¥ææšãšããŠå°å
¥ããããã»ã¢ã«ã·ã¢ãç¹èããŠããããã»ã¢ã«ã·ã¢ïŒRobinia pseudoacaciaïŒã¯ãåã¢ã¡ãªã«åç£ã®é«æšæ§ã®å€æ¥æš¹ã§ããããã¡ç§ã§ããæ ¹ç²èãšæ ¹ã§å
±çããŠããããã貧æ é€ãªåå°ã§ãè¯ãçè²ã§ããæ ¹èèœãè¡ãããšãã§ãããããååžãæ¡å€§ããŠããããã»ã¢ã«ã·ã¢ã¯èèœåãé«ããããäŒæ¡ããŠãå€æ°ã®èèœå¹¹ãçºçããããããåäœæ°ç®¡çãé£ããããããŸã§ãå·»ãæ¯ããã«ããé§é€ã®ç 究ãããã€ãè¡ãããŠããããã©ã®ãããªå·»ãæ¯ããæ¹æ³ãæãæå¹ã§ãããã«ã€ããŠæ€èšãããäŸã¯å°ãªããããã§æ¬ç 究ã§ã¯ãæ¹å±±ã®æ£®ã調æ»å°ãšããŠããã»ã¢ã«ã·ã¢ã«åŠçãæœããåŠçåŸã®èèœã®çºçæ°ãšèèœçã®èª¿æ»ãè¡ã£ããåŠçã«ã€ããŠã¯ãã³ã³ãããŒã«ãšããŠã®ç¡åŠçã®ã»ãã«æ¬¡ã®ïŒã€ã®åŠçãè¡ã£ãããªãã調æ»å¯Ÿè±¡æšã®å¹³åDBH ã¯13.4 cmã§ãã£ããåŠçæ¹æ³ã¯ãïŒïŒïŒå°è¡šé¢ããé«ã1 m ïœ1.3 m ã®å¹
30 cmãïŒïŒïŒå°è¡šé¢ããé«ã3 m ãå¹
30 cmãïŒïŒïŒå°è¡šé¢ãã1.3 m ãå¹
130 cmãããã«ãïŒïŒïŒå°è¡šé¢ããé«ã30 cm ã§äŒæ¡ããåäœããããã5 æ¬ãã€éžå®ããã察ç
§æšãšããç¡åŠçã®åäœããã»ãŒåããµã€ãºã«ãªãããã«5 æ¬éžå®ããããããã®åŠçåŸã1 ã¶æåŸãïŒã¶æååŸãïŒã¶æåŸã®èèœæ°ãšèèœå¹¹ã®é·ãã枬å®ããããã®çµæãç¡åŠçãšæ¯èŒããŠãäŒæ¡ãããšèèœæ¬æ°ãå€ããªããèèœå¹¹ã®æé·éã倧ãããªã£ããå·»ãæ¯ããåŠçã¯åæã®èèœæ¬æ°ã¯å€ããªãããçºççãäœããªããæ¯æ»ããèèœå¹¹ãå€ããªã£ããæ ¹èèœãå°ãªããªãããããã»ã¢ã«ã·ã¢ã®åäœæ°ç®¡çã«ã¯å·»ãæ¯ãããæå¹ã§ãããšèãããããããã«ãå·»ãæ¯ããã®äžã§ããå°è¡šãã30 cm ã®é«ããå¹
30 cm ã§å·»ãæ¯ãããããã®ãæãå¹æçã§ãããåŽåãå°ãªããŠãããã»ã¢ã«ã·ã¢ã®åäœæ°ç®¡çæ¹æ³ã§ãããšèãããã
Fundamental studies on the reproductive strategies of Quercus serrata - Pollination patterns in different flowering heights -
ã³ãã©ã¯è±ã®åœ¢è³ªãã颚åªè±ãšãããŠããããè¿å¹Žèšªè±æè«ã確èªãããŠããããã®éç²æ§åŒã¯æªè§£æã§ãããããã§ãéç²æ§åŒã解æããã«ãããã次ã®ãããªä»®èª¬ãç«ãŠããæš¹å äžéšã§ã¯ã颚åªã®å²åãäžéšããé«ããäžéšã§ã¯ãè«åªã®å²åãäžéšããé«ããšãããã®ã§ããããŸããæè«ã®èšªè±é »åºŠã¯è±ã®ãã£ã¹ãã¬ã€ãµã€ãºã«åœ±é¿ãåãããããã³ãã©ã®è±åºæ°ãè±åºé·ãèæ
®ããå¿
èŠãããããããã£ãŠãçè±é«åºŠã®éãã«ããéç²è
ã®è²¢ç®åºŠãçè±é«åºŠãšéç²è
ã®éãã«ããçµå®ãžã®åœ±é¿ãçè±é«åºŠãšè±ã®ãã£ã¹ãã¬ã€ãµã€ãºã蚪è±æè«ã«äžãã圱é¿ãæããã«ããããšã«ãã£ãŠã³ãã©ã®éç²æ§åŒã解æããç¹æ®æŠç¥ãæããã«ããããšãç®çãšãããæš¹å äžéšã§ã¯ã蚪è±æè«ãå¶éãããšçµå®çãäœäžãããçš®åãµã€ãºã¯äžéšã®æ¹ã倧ããã£ãããã°ãã€ãã¯äžéšãšäžéšã§å€ãããªãã£ãããŸããçè±é«åºŠå¥ã®èšªè±æè«ã«ã€ããŠã¯ãäžéšã®æ¹ãäžéšããåäœæ°ãçš®é¡ãå€ãã£ããããã«ã蚪è±æè«ã¯é¢šéãäžå®ä»¥äžã«å€§ãããªããšèšªè±ããªããªããäžéšã§ã¯èšªè±é »åºŠãäœäžããããšãåãã£ããè±ã®ãã£ã¹ãã¬ã€ãµã€ãºã«ã€ããŠã¯ãäžéšã®æ¹ãåäœé¢ç©ãããã®è±åºæ°ãå€ããè±åºã¯çããäžéšã§ã¯è±åºãé·ããã®ãå€ãã£ããæè«ã®èšªè±é »åºŠã¯é¢šéã ãã§ãªããè±ã®ãã£ã¹ãã¬ã€ãµã€ãºã«ã圱é¿ãåãããããè±åºæ°ã§ãããè±åºé·ã§ãããã¯çš®ã«ãã£ãŠç°ãªã£ãã以äžã®ããšãããéç²è
ã§ãã颚ãšæè«ã«å¯ŸããäŸå床ãçè±é«åºŠã«ãã£ãŠç°ãªãããšã瀺åããããããã
Effects of wind fence protection on the growth and regeneration of coastal black pine (Pinus thunbergii Parl.)
é²é¢šæµã«ããä¿è·ãã¯ãããã®æé·ãšæŽæ°ã«äžãã圱é¿ãæããã«ãããããé³¥åçåæ¡ç äžã«æç«ããŠããã¯ããã海岞æã«ãããŠ2ã€ã®ãããããèšçœ®ããã1ã€ã®ããããã¯ãæµ·åŽã«é²é¢šæµãããããã1ã€ã®ããããã¯é²é¢šæµã®ãªããã®ã§ãããããããã®ããããã§ãæš¹é«ãèžé«çŽåŸã䞻軞ã®äŒžé·æé·éã暹幹ã®åŸããæ¯æçãæš¹å é¢ç©ã調æ»ããããŸããããããã®ããããå
ã§å€©ç¶æŽæ°ããŠããçšæš¹ãšå¹Œæš¹ã®æ°ãšæš¹éœ¢ã調ã¹ãããæš¹é«ãèžé«çŽåŸã䞻軞ã®1幎åœãã®äŒžé·æé·éã¯ãé²é¢šæµã®ãªããããããããé²é¢šæµã®ããããããã§å€§ããã£ããããã«ã暹幹ã®åŸããšæ¯æçã¯ãé²é¢šæµã®ããããããã§å°ããã£ããçšæš¹ãšå¹Œæš¹ã®å¯åºŠãšæš¹éœ¢ã¯ãé²é¢šæµã®ããããããã§å€§ããã£ããããããã®ããšãããé²é¢šæµã¯ã朮颚ãé²ãé«ãæ©èœã«ããã海岞ã«æè²ããã¯ãããã®æé·ã塩颚ããä¿è·ããŠãããšæšå¯ããããé²è·çã®ããæåã«ãããæš¹å 被èŠã®é©åãªç®¡çã¯ã海岞æã®æµ·åŽã§ãã£ãŠãã倩ç¶æŽæ°ãå¯èœã«ããããšãã§ãããåŸã£ãŠãé²é¢šæµã«ãã颚ããã®æ©èœã¯ãåžžã«å¹æçã§ããããšãæåŸ
ã§ãã
Forest structure and the unevenness of seed dispersal by birds
æ¬ç 究ã¯, 森ææ§é ãšé³¥é¡ã«ããçš®åæ£åžã®é¢ä¿ãæããã«ããããšãç®çãšãã. å£ç¯ã«ãã£ãŠé³¥é¡ã«ããçš®åæ£åžãéäžããå Žæãç°ãªã, ç§ã«ãããŠã¯å¹Žã«ãã£ãŠãç°ãªãååžã瀺ãã. ãããã®ããšãã, å£ç¯ã幎ããšã®çµå®åäœã®çè²ååžã®éããé³¥æ£åžçš®åã®éäžååžã«åœ±é¿ããŠãããšèãããã. ãããæ¥ã«ãããŠã¯, çµå®åäœã®ãªãå Žæã§ãé³¥æ£åžçš®åæ°ãå€ããªãå Žæãã¿ããããã, ãã®ãããªå Žæã§ã¯çµå®åäœãšã¯å¥ã®èŠå ãé³¥é¡ã®è¡åã«åœ±é¿ãããšèãããã. 1幎ãéããŠç¢ºèªé »åºŠã®é«ãã£ãããšããªãçš®åæ£åžè
ãšããŠæãè²¢ç®ããŠãããšèãããã. æ¥ã«æ¡é€ã芳å¯ãããããšããªã¯ã»ãšãã©ã®åäœãäºé«æšå±€ãšé«æšå±€ã§èŠ³å¯ããã. ãããã£ãŠ, æ¥ã®é³¥é¡ã®è¡åã¯äºé«æšå±€ãé«æšå±€ã®å¯åºŠã®éãã«åœ±é¿ãåãããšèãããã. èæ¬å±€ããé«æšå±€ã®å¯åºŠãšèªç¶èœäžçš®åæ°ã説æå€æ°, é³¥æ£åžçš®åæ°ãç®çå€æ°ãšã, éååž°åæãè¡ã£ãçµæ, æ¥ã«ãããŠé«æšå±€ã®å¯åºŠãé«ãå Žæã§é³¥æ£åžçš®åæ°ãå€ããªãæ£ã®çžé¢ãèªãããã. ããã¯, ç¹æ®æã®é³¥é¡ããœã³ã°ãã¹ãã«ãªãåŸãé«æšã奜ãããã ãšèãããã. 森æã®é³¥æ£åžçš®åã®ååžã«æã圱é¿ãäžããèŠå ã¯, ã©ã®å£ç¯ã«ãããŠãçµå®åäœã®çè²å Žæã®éãã§ãã, é³¥é¡ã®ç¹æ®æã«ãããæ¥ã«ãããŠã¯, 森ææ§é ã®éããé³¥é¡ã«ããçš®åæ£åžã®äžåäžæ§ã«åœ±é¿ãäžããããšã瀺åããã
Fundamental studies on the forest management of national park : Forest dynamics and disturbance regime of Fagus crenata forests in the Daisen national park area
森æãã©ã®ããã«æç«ããçŸåšã®æåã®çºéã«åœ±é¿ããã®ããå
¬å管çãããäžã§éèŠã§ããã調æ»å°ãæ¹ä¹±ã®ã¹ã±ãŒã«ã«ãã£ãŠæ¯èŠ³ã¬ãã«ãšæåã¬ãã«ã®äºã€ã«åããæ¬ç 究ã§ã¯æåã¬ãã«ã§æ¹ä¹±äœå¶ãšæ£®æåæ
ãæããã«ããããšãç®çãšãããæšé«600ïœ1100mã®å°åã«15 ãããããèšçœ®ããDBH 3 cm以äžã®å
šæš¹çš®ãæ¯æšèª¿æ»ããã³ã¢æ¡åããŠå¹ŽèŒªè§£æããããå
šããããã§29 çš®ãåºçŸããããã®BA åªå 床ã«åºã¥ãçºé段éããšã«ãããããåé¡ãããDBHéå¥æ¬æ°é »åºŠååžã¯ãçºé段éã«ãã£ãŠéãããã£ãããçžé¢ä¿æ°ãD-Hæ¡åŒµçžå¯Ÿæé·åŒã®ãã©ã¡ãŒã¿ã¯çºé段éã«ããéãã¯ãªããçš®æ°ãåç床ãå€æ§æ§ãçºé段éã«ããéãã¯ã¿ãããªãã£ããåäœã®è¥å€§æé·éãDBH éå¥æ¬æ°é »åºŠååžã暹幹éšèèœçãããæ¹ä¹±äœå¶ãæããã«ããçµæãããããããšã«é »åºŠã匷床ãææã®ç°ãªãäŒæ¡ãè¡ããããšæšå®ããããæ¯èŠ³ã¬ãã«ã§äººçºçæ¹ä¹±ãåãã§ããªããšæãããæåããæåã¬ãã«ã§ã¿ããšãã®å€ãã¯æ§ã
ãªèŠæš¡ã匷床ãææã®æ¹ä¹±ãåããŠãããããã«ãã£ãŠããïŒããºãã©çŸ€èœãã¯ãªïŒããºãã©çŸ€èœãªã©ã®ä»£åæ€çã«çœ®ãæãã£ãŠããã人çºçæ¹ä¹±ã«ãã£ãŠæ¯èŠ³ã¬ãã«ã§ãããæã®åçè€åäœãšããŠç°ãªãphase ã圢æããŠãããšèãããããåœç«å
¬åã®æ£®ææ€çã管çããããã«ã¯ã森æãåçãªãã®ãšèªèãã森æã®æ¹ä¹±ãã¿ãŒã³ãæããã«ããããšã§ãæ§ã
ãªã¹ã±ãŒã«ã§ããé·æçã«ã¢ãã¿ãªã³ã°ããããšãå¿
èŠã§ããã / The purpose of this study is to clarify the forest dynamics and disturbance history at two levels (the landscape level and the forest level).This study focused on the forest level how human-related processes had an influence on the forest dynamics that are important to environmental management in the Daisen national park area. For the forest level analysis, we set 15 plots at the areas where natural vegetation was beech forest (600 to 1100m above sea level). Within the fifteen plots, total 0.45 ha, twenty-nine species (DBH>=3 cm) were found. We analyzed the tree-ring widths and classified the plots as Early, Middle and Late stages of forest development by BA dominance of Fagus crenata. The DBH frequency distribution by the number of trees was different from each stages of forest development. The DBH?height relationship was not fitted to the hyperbolic equation (1/H=1/AD^h+1/H^*) by each stages of forest development. There were not cleary correlation about number of species, homogeneity factor and species diversity (H') which were calculated on the basal area of each species, by each stages of forest development. It is estimated from the percentage of growth change (%GC) that forest cut down with different frequency, intensity, and times had been carried out in every plots. Many forests were thought that there was no influence of human disturbances at landscape level. However, they were affected by human disturbances with different frequency, intensitiy and time at forest level. Natural vegetation is Lindeto umbellatae-Fagetum crenatae in the Daisen national park area. It was changed into Fagetum crenatae-Quercetum crispulae, Castaneo-Quercetum cripulae. Actual vegetation is the different phases of the regeneration complex in natural beech forests at landscape level. We should recognize the forest to be dynamic to manage the forest vegetation in the national park, and it is important that we clarify the disturbance patterns in the forest ecosystems. It is necessary to manage the processes in the regeneration complex of forests in various scales, and to monitor them in a long-term
ããŠã³ãŠ ãã§ã ãžã㊠ã»ã€ã ã ãžãã¿ã€ ã ãœã ããã¿ããã ã³ãŠãµã : ãŒã³ã³ã¯ ãžãã¿ã€ ãã§ãŠãµ ã ã¢ããºã€ã
In order to determine the occurrence rate of school refusal at primary schools and junior high schools, different grades as well as boys and girls treated separately, we conducted a research in the 47 prefectures of Japan. We mailed a questionnaire to the local governor's bureaus in all prefectures. Items included the number of boys and girls, total number of children with long-term absence due to illness, poor economic conditions, school refusal and other reasons in each grade of all elementary and junior high schools within the prefecture. We received answers from 40 prefectures altogether but only in 4 of them were the grades as well as the sexes treated separately. Eight questionnares were excluded from the analysis because of incomplete recordings. The main results are as follows: 1. The number of students who refused to go to school in the 4 prefectures where different grades and the sexes were treated separately was 6,691 (primary school: 775, junior high school: 5916). 2. The average occurrence rate of school refusal in the four prefectures. was 0.038% in primary schools and 0.598% in junior high schools. 3. The boy to girl ratio in primary schools was about 4:3 and in junior high schools about 5:4, with a trend of the boys always having a higher rate of occurrence. 4. The rate of school refusal showed a gradual increase from first to third or fourth grade and it increased dramatically at 4th or 5th grade of the primary school. This tendency was stronger among boys than girls. 5. The rate increased darastically from the 6th grade of elementary school to the first grade of junior high school, and later it increased linearly as a function of grade. 6. In the case of primary school students, we noticed that in those prefectures where the number of children was under 120,000, there appeared an inverse relarionship between the number of children and the occurrence rate, and tlen in prefectures where the number of children fell between 120,000 and 165,000. the occurrence rate was roughly fixed, while in those prefectures where the number of students exceeded 165,000, the occurrence rate trend to increase proportionately with the higher numbers of children. These results suggest that the emergence of school refusal-on the grounds of unsatisfactory development in earlier periods of life-might be closely connected with the unstable mental states during the critical shifting periods of development, the so-called periods of crisis (Trotz-phase) around the age of 9 and 14
Fundamental Studies on the Management of Secondary Forests after the Decline of Pinus densiflora in Warm-temperate Regions : Regeneration Patterns of Three Species of Fagaceae and Persea thunbergii
Limitation in the Photosynthetic Acclimation to High Temperature in Canopy Leaves of Quercus serrata
As temperature dependence in many biological processes is generally a bell-shaped curve, warming may be benefitial at cooler climate but deterimental at warmer climate. Although warming responses are expected to vary between different temperature regimes even in the same species, such variations are poorly understood. We established open-top canopy chambers, in which average daytime leaf temperature was increased by ca. 1.0°C, at the canopy top of Quercus serrata in a deciduous forest in high (HL) and low (LL) latitude sites and studied temperature dependence of photosynthesis in the leaves across seasons. In control leaves, photosynthetic rates were higher in LL than in HL. Reponse to warming was different between HL and LL; an increase in growth temperature increased photosynthetic rates at higher leaf temperatures in HL but decreased in LL. Lower photosynthetic rate in the warming treatment in LL was partly explained by lower leaf mass per area and leaf nitrogen content per unit leaf area. Optimal temperature that maximizes photosynthetic rate (Topt) linearly increased with increasing growth temperature (GT) in HL, whereas it was saturating against GT in LL, suggesting that Topt in Q. serrata has an upper limit. The variation in Topt was explained by the activation energy of the maximum carboxylation rate (EaV). Our results suggest an upper limit in temperature acclimation of photosynthesis, which may be one of the determinants of southern limitation of the distribution
- âŠ