احداث کلکسیون پایه مادری صنوبر

Poplar collection project was carried out in the continues of the national project of gathering native and exotic poplar clones and establishing of selection nursery, by using 58 different species and clones in year 1984 in the Karaj Alborz research center. In this collection from each clone five two -year- old seedlings in line form and with 5 by 8 meters spacing were planted. During the next years more new clones from five poplar sections gradually were added the perivous ones. therefore the total number of poplars in collection became 69. Some investigations were carried out in this collection that consisted of quntative measurments (diameter at breast height - dbh - , height, crown diameter, crown area,) phenology study, trees stem survey, resistance study of clones to pests and diseases, which have been done according to the kind of work in the suitable season. Also during each growing season irrigation, weed control and branches punning have been done. The results of this study may be summarized as follows: By checking the days on which the leaves and flowers appear during the experiment years we can see that at the begining of the vital activities trends from April to March and from March to Febrwary. this means that spring begins sooner in the last years of the experiment. In the other word the lenght of the growth season during this years has increased by several days in karaj climate conditions. In the case of crown dimension clones from Populus euramericana costanzo with an average crown area of 49.24 square meters had the widest and clones from Populus nigra 56/21 with the average of 4/39 square meters had the narrowest crown. In the case of stems form and clones from Populus nigra 56/21 and Populus nigra 42/55 had the most straight stems and the stems of most of clones from Populus euramericana, Populus alba and Populus deltoides had a little curve. Clones from Populus alba nivea and Populus euphratica had the most curve in the stem. At the end of the experiment period clones from Populus alba with 90% of green trees had the most survival and the clones from Populus euramericana, Populus nigra and Populus deltoides with 89%, 84%, 64% survival percentage respectively were in the next levels. Keyword: poplar, collection, phenology, morphology, clone.

کلیدواژه ها:

فنولوژی ، موفولوژی ، کلن ، تاج ، کلکسیون ، پایه مادری ، صنوبر