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Volume 68, Issue 11
Displaying 1-8 of 8 articles from this issue
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Morio ITO1986 Volume 68 Issue 11 Pages 439-446
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSSeveral trials were made to study the effects of thinning and fertilization on pruned plots of Chamaecyparis obtusa S. et Z. The stand studied was 15 years old, and crowns had well closed. This report covers the results of six years. 1) Diameter growth and height growth decreased with pruning, but fertilization stimulated them. Thinning was not important for height growth. 2) Stem volume increment increased about 48% per tree and about 19% per unit of ground area with the combination of thinning and fertilization, in spite of its decrease of about 8% on the pruned plot. 3) Thinning and pruning had the effect of making the trees uniform in size. The sizes of trees become widely distributed by fertilization on the non-thinned plot. 4) Values of non-taperness reached the maximum by the combination of pruning and fertilization. 5) The proportion of the stem biomass of the total above-ground biomass reached a maximum by the combination of thinning, pruning, and fertilization, but the maximum of the amount of stem produced was found when pruning and fertilization were made without thinning. 6) It was concluded that silvicultural technique combined with thinning, pruning, and fertilization is the most effective means for the production of uniform, knotless, and non-tapering timber without reducing stem growth per tree and per unit of ground area.View full abstractDownload PDF (626K) -
Seed production in secondary beech forests with six different diameter classesTomohiko KAMITANI1986 Volume 68 Issue 11 Pages 447-453
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSThe relationships between the mean DBH and seed production were investigated on 6 secondary beech forests. The results were as follows: 1) The minimum fruit-bearing tree was observed in the stand of 7.4cm mean DBH and its DBH was 8cm. 2) Fruit-bearing trees were observed in canopies under good light conditions even if they were small. There was a tendency for the age of fruit-bearing trees to be lower in stands of sprout origin as compared with those of seedling origin. 3) The relationships between mean DBH and seed production showed an increase tend of an exponential curve. In stands of sprout origin, seed production was more than that in stands of seedling origin when mean DBH was similar for each stand. It was assumed that the difference of reproductive capacity in these two stands of different origin might be caused by the difference of root age even though the stem age was similar. 4) The coefficient of variation of fallen seeds per m2 was smaller in a stand having greater mean DBH, or in a stand of more fallen seeds. 5) The percentage of the number of full seeds increased with an increase in the mean DBH of stands and reached a maximum of 65%, regardless of the stand origin.View full abstractDownload PDF (542K) -
Hiromi MIZUNAGA1986 Volume 68 Issue 11 Pages 454-461
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSSeasonal changes of water relation parameters and diurnal changes of the xylem pressure potential, transpiration rate, and stomatal resistance were studied in leaves of hinoki (Chamaecyparis obtusa S. et Z.) growing on eroded soil. The volume of symplasmic water at full turgor per unit dry weight (V0•DW-1) was low in winter, but increased from spring to summer. This change of V0•DW-1 had an effect on the osmotic potential at full turgor (_??_ssat). The xylem pressure potential (XPP) decreased as the transpiration rate increased, and hysteresis was observed even when the pre-dawn xylem pressure potential (XPPmax) was high. Although stomatal resistance decreased as the photon flux density increased, midday closure of stomata occurred, especially under drought conditions.View full abstractDownload PDF (552K) -
Kenji FUKUDA, Kazuo SUZUKI1986 Volume 68 Issue 11 Pages 462-466
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSAscocarps of a fungus were found on every gall on the branches and stems of Cryptomeria japonica D. DON from May to June. This fungus had been named Nitschkia tuberculifera KUSANO, however, features of the fungus were clearly different from the characteristics of the genus Nitschkia. Identification of the fungus should be pursued in detail. The fungal infection begins in the axil part of leaves of young green shoots. These Cryptomeria galls develop from hyperplasia of the infected tissue. Subsequently, meristematic cells induced by the hyphae are differentiated into parenchymatous cells and cambia. An uneven distribution of the hyphae results in the formation of a rough surface with many small papula around the infected part. The Cryptomeria gall has been classified as an organoid gall like witches' broom; however, the gall tissue is different from the healthy tissue of Cryptomeria shoots and has properties similar to those of callus tissue and other histoid galls.View full abstractDownload PDF (1093K) -
The operational efficiency of the helicopter yarding systemJiro TOBIOKA1986 Volume 68 Issue 11 Pages 467-471
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSDownload PDF (398K) -
Yuji IDE, Shigehiro YAMAMOTO1986 Volume 68 Issue 11 Pages 472-474
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSDownload PDF (829K) -
Toshio YANBE1986 Volume 68 Issue 11 Pages 475-477
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
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Toshio SUDA1986 Volume 68 Issue 11 Pages 478-481
Published: November 25, 1986
Released on J-STAGE: December 18, 2008
JOURNAL FREE ACCESSDownload PDF (355K)
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