نوع مقاله : مقاله پژوهشی
نویسندگان
1 نویسنده مسئول، مربی پژوهشی، مرکز تحقیقات کشاورزی و منابع طبیعی استان قم، قم ص. پ. 775-37189
2 مربی پژوهشی، مرکز تحقیقات کشاورزی و منابع طبیعی استان قم
3 کارشناس ارشد مؤسسه تحقیقات جنگلها و مراتع کشور، تهران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Arizona cypress (Cupressus arizonica Green.) is an exotic species that has been brought to Iran a long time ago. It is planted in different areas with various climatic conditions. This research was carried out in the period 2004 to 2006 to determine the causal agent of dieback and decline of Arizona cypress trees , at Ghadir Park located 9 kilometer south of Qom city. The optimum or limitation factors studied on the growth and development of cypress trees. At last some recommendation advise for improving current condition. The observations and tests showed that collection of ecological and physiological factors led to Arizona cypress dieback. However primary cause of weakness and mortality the cypress trees in the local conditions, are unsuitable soil and water salinity. Water salinity and lack of leaching , leads to salts assembling. Secondary factors such as Nattrassia mangiferae Suttan and Dayko attack to plant, when they get weak and stress conditions intensified, so speeding and boosting dieback process.
کلیدواژه‌ها [English]
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