نوع مقاله : علمی- پژوهشی
نویسندگان
1 عضو هیأت علمی، بخش تحقیقات جنگل، مؤسسه تحقیقات جنگلها و مراتع کشور، تهران، ایران
2 عضو هیأت علمی، بخش تحقیقات جنگل، مؤسسه تحقیقات جنگلها و مراتع کشور، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This paper presents the results of four elimination and two pioneer(growth) trials with 22 tree species and provenances in un-irrigated plantation conditions in North-west Iran. The studied areas are characterized as semi-arid zone with very cold winters(Fig.1). The summer drought lasts between 111 and 132 days and frost days between 97 and 115 days(Tab. 4).
The geology is basically formed of sedimentary limestone. The degree of alkalinity and salinity is high and the organic matter is often at a very low level.
The results(Tables 6, 8, 10, 12, 14) showed that the most promising species include:
Elimination trials Pioneer(growth) trials
Uromieh: Celtis australis Eleagnus angustifolia
Fraxinus xanthoxyloides Fraxinus pseudoacaia
Robinia pseudoacaia Fraxinus rotudifolia
Eleagnus angustifolia Robinia pseudoacacia
Khoy: Eleagnus angustifolia
Cercis siliguastrum
Maku(only promissing species):
Pyrus syriaca
Eleagnus angustifolia
Robinia pseudocaia
Fraxinus rotundifolia