نوع مقاله : علمی- پژوهشی
نویسندگان
1 عضو هیأت علمی مرکز تحقیقات کشاورزی و منابع طبیعی استان مازندران، ساری.
2 عضو هیأت علمی مؤسسه تحقیقات جنگلها و مراتع
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
A 19 year old plantation (4×4m) of Redwood on an area of 0.16 ha was selected in Chamestan Experimental Station in Mazandaran Province (North Iran). Results indicate that mean of diameter at breast height ,height and volume per hectar were 31/8cm ,15/15m and 310/65 sylve, respectively. Also the following results were obtained :
- mean of annual d.b.h. increment = 16/8mm
- mean of annual height increment = 80cm
- mean of annual volume increment = 21/55m3
- h/d coefficient = 47/6
The diameter class of 30-35 cm had the greatest number and volume of trees. Increase in d.b.h. decreased form factor and stability coefficient. Seed production started at age of 15 year. The number of seeds per kilogram and their germination percentage was 288018 and 22, respectively. Survival of Sequoia sempervirens after 19 years and at density of 712 per ha, was 94 percent. Plantation of the species is recommended for climatically and edaphicaly matched sites due to its high rate of survival and growth.
کلیدواژهها [English]