احداث باغ بذر گونه های ون و نمدار به صورت نهالی و پیوندی (در چمستان نور)

Increase of population, extension agriculture lands and cities, development of industries causes forest degradation and its surface decrease. Need of ever increasing to wood and its products, increment of plantation surface and product amount is a must. The use of improved seeds and seedling with genetically quality is one of the most important ways for this case. Now, The seeds for executive organizations, natural resources officer of provinces and private sections are collecting without any pay attention to plants breeding principles and genetically characteristics. The loss of elite seed source trees, specially in northern forests increasing this problem. In same cases, using of unsuitable seeds and seedling causes unsuitable results in plantation. This project was started and performed for achievement perfect principles and methods in supplying improved seeds 1994. Based on project plan and related forms, at first natural sites of Ash tree (Fraxinus) and Lime tree (Tilia) were recognized in various areas of mazandaran province. Then plus trees of per species were selected and marked. Due to loose of ash trees seeds in 1994 and 1995, its seed were prepared and collected in 1996 and they were planted in the research station nursery after necessary treatments. The ash tree seedling were allocated and replanted in main site with planting space of 3*3m in 1997 and 1998. Some ash tree saplings that were grafted in 1997 and 1998 were replanted in main site (one km distance from seedling) after necessary growth with planting space of 5*5m in 1999. For lime trees, due to unenoufh-grafted saplings the grafting seed orchard of lime tree was not establishment due to unenough grafted saplings, (although, the saplings were grafted in 1994 and its next year). The seedling of lime tree was planted in main site after necessary selection with 3*3m distance. The results show ash tree seedlings have .34cm diameter growth, .4m-height growth, 100% survival and grafted saplings showed .36cm diameter growth, .44m-height growth and 91% survival. On the basis of trunk branching, trunk cylindrical and number the ash tree seed source trees have very suitable situation. The ash tree seed trees have fewer branches and most of them have unit and cylindrical stem. Diameter and height growth of ash is .39cm and 38cm and its survival is 98%. Key words: Seed orchard, Lime tree (Tilia), Ash tree (Fraxinus), Seedling, Grafting, Chamestan