66 トドマツ結実の豊凶と気象との関係に就いて

概要

論文の詳細を見る
On the relation between the harvests of firseeds in Horo Experimental Forest in South Saghalien, where the fir is naturally distributed as its northern native rcion, and the meteorological elements which observed at Otiai Meteorological Observatory in 20 years, the investigation was practiced. The results are as follows : 1) As the differentiations of flower buds of the fir always occur in July or August in preceding years of the harvests, the carrelations of the harvest grades and meteorological elements in preceding two years were investigated. As the meteorological elements, monthly means of average air temperature, maximum air temperature, evaporation, humidity, amount of precipitation, velocity of wind and percentage of sunshine in every month from Janualy till August and moreover means of those meteorological elements in two or three months of May〜June, May〜July, May〜Augst, June〜July, June〜August and July〜August, were used.2) There is no clear correlation between the grades (good and average or poor) of harvest and maximum air temperature, amount of precipitation, amount of evaporation, percentage of sunshine, humidity, or wind velocity in preceding years. But there seems to be indistinct correlation between the grades of harvest and monthly means of average air temperature in July of preceding year.3) Especially the correlation between the grades (good and average or poor) of harvests and minimum air temperature in preceding year is found to be close. All 10 good (including average) harvests were happened when means of minimum air temperature in July, May〜July, May〜August, June〜July, June〜August and July〜August of preceding years were higher than 10.4℃, 5.4℃, 7.2℃, 7.7℃, 9.3℃ and 11.5℃, and all 3 poor harvests were happened when means of minimum air temperature in these months were lower than 9.3℃, 5.2℃, 6.9℃, 7.3℃, 8.8℃ and 10.6℃.4) There is no clear correlation between the grades (good or average) of harvest and meteorological conditions in preceding year. But there seems to be distinct correlation between the grades of harvest (good or average) and mean, maximum, and minimum air temperature in 1〜4 months two years ago. All 8 good harvests were happend when means of mean air temperature in May〜July two years ago were lower than 11.5℃, means of maximum air temperature in May〜July, May〜August and July〜August in these years were lower than 17.4℃, 18.8℃, and 23.2℃ and means of minimum air temperature in these years were lower than 1.9℃. And 2 average harvests were happend when these air temperatures as related before were higher than 12.1℃, 18.0℃, 19.6℃, 24.0℃. and 2.4℃.5) In the following years of good harvests, the harvests are always poor at any rate of meteorological conditions in preceding two years, and those causes are expected to be related with storage of nourishments in the trees.
一般社団法人日本森林学会の論文
1950-12-25

66 トドマツ結実の豊凶と気象との関係に就いて

スポンサーリンク

概要

著者

関連論文

スポンサーリンク