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Scotch Pine: Variation And Performance In Minnesota, Muhammad A. K. Khalil
Scotch Pine: Variation And Performance In Minnesota, Muhammad A. K. Khalil
Journal of the Minnesota Academy of Science
Scotch pine exhibits clinal variation from north to south in two characteristics: viz., the number of days after April 15 to the time of maximum rote of height growth, and total height after the age of 17 years. There is east-west clinal variation with respect to two characteristics: viz., the number of days after April 15 to the beginning of height growth, and to the time of the maximum rote of height growth. The twelve out of the fifteen varieties analyzed showed the existence of valid sub-varieties or ecotypes. Varieties from central Europe were the fastest growing in each of …
A Study Of Annual Accumulation Of Organic Matter In A Five-Year Old Larix Laricina, Vincent A. Heig
A Study Of Annual Accumulation Of Organic Matter In A Five-Year Old Larix Laricina, Vincent A. Heig
Journal of the Minnesota Academy of Science
The purpose of this study is to evaluate a method of calculating the annual accumulation of xylem in shoot system of a tree. Larix laricina was ideally suited for this study because of several structural traits. Its terminal bud scale scars or girdles remain visible up to approximately eight years after their formation and make it possible to differentiate between each year's addition in stem length. It has one dominant leader bud which forms a straight main axis facilitating the differentiation between axial and secondary branch growth. Larix laricina also has growth rings which can be easily identified when cross …