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ありかつはかまや
5 years ago
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1 ( ) * Regeneration of many tree species by soil scarification under canopies -Relation between canopy openness and species richness- Hajime SATO ( ) PAR (2) Hokkaido Forestry Research Institute Bibai Hokkaido Bulletin of the Hokkaido Forestry Research Institute No 36 March 1999

2 /ha PAR ( 1998)

3 cm 1 22cm 20 25cm 30cm (DBH 134cm) PAR PAR>60 PAR<60

4 0.28 = = PAR20 PAR PAR ( ) 6 (60 ) **,P<0.01 *,P<0.05,0.05<P<0.1(U, G, ) 5 PAR,,

5 2 2 H 2 H D 2 H 0.01 PAR D 2 H D 2 H 2 2 cm ** 97.9** 196.8** 0.21** PAR 2 2 H 2 1 (4) ( 6) 2 H 14 3 R D 2 H **,P U

6 Connell 1978 Connell %

7 Y=(448.5D 2 / exp[- log(x)-3 2 /0.72] 1 Sato and Hiura 1998 Y Y=(314D 2 / exp[-{1og(x)-3} 2 /0.72] cm 5.2 ha 50cm ha 30cm 50cm ha 3

8 ( 1994) ha ha cm Canham 1989 /ha

9 Canham C.D 1989 Different responses to gaps among shade- tolerant tree species Ecology 70: Connell J. H 1978 Diversity in tropical rain forests and coral reefs Science 199: pp pp pp pp Sato H and Hiura T 1998 Estimation of over1apping seed shadows in a northern mixed For. Ecol. Manage. 104: : pp

10 Summary To clarify how to promote natura1 regeneration of many species not only Betula ermanii,i investigated natural regeneration process at various sites with different canopy openness on a scarified ground for three years after soi1 scarification Numbers of animal- dispersed seeds such as Quercus mongolica var. grosseserrata Kalopanax pictus,cornus controversa and Sorbus commixta increased as canopy openness decreased.on the contrary,numbers of wind dispersed seeds such as B. ermanii and Abies sachalinensis did not relate to canopy openness. Among saplings that emerged for a year after the soil scarification,survival of B.ermanii was inferior to that of Phellodendron amurense under 40%of %PAR (percent photosynthetic active radiation).growth of B.ermanii was not different from that of P. amurense and A. sachalinensis under 20 of PAR although that of B. ermanii was superior to that of P. amurense and A. sachalinensis over20%par. Among saplings that emerged after two years from the soil scarification growth and survival of Q. mongolica var. grosseserrata were superior to those of B ermanii under 40%PAR.Volume ratio of species except B ermanii such as P. amurense,q. mongolica var. grosseserata and S. commixta against all tree species among six saplings per quadrat after three years from the soil scarification of which volumes was larger than other sapling negatively correlated to PAR Quadrats number of which volume ratio of species except B ermanii surpassed 0.5 was increased under 30 PAR Species diversity of saplings was higher on the site where seed density of B ermanii was low than on the site where that was high. From mentioned above to promote regeneration of many species the soil scarification under closed canopy or under canopy where seed density of B. ermanii is low is important I tried to quantify those conditions from my results and previous reports. Key word: soil scarification regeneration sapling preregeneration system percent phtosynthetic active radiation seed dispersa1 species richness

Effects of Light and Soil Moisture Condition on the Growth of Seedlings for Quercus serrata and Quercus variabilis NISHIMURA, Naoyuki*, OTA, Takeshi**

Effects of Light and Soil Moisture Condition on the Growth of Seedlings for Quercus serrata and Quercus variabilis NISHIMURA, Naoyuki*, OTA, Takeshi**, SAKAMOTO, Keiji*** and CHIBA, Kyozo*** Key words:

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