The rangelands of  "Vaz" with 5150 hectar extension is in the Chamestan region of Mazandaran province. Twenty plant communities distincted at the rangelands by using of physiognomic-floristic method. The relationship between plant communities determined by using of ordination and calculation of Gleason similarity index, with considering of quantity amounts  (frequency-cover). Location of each plant community on axes determined by Beal's method and relationship of them has showed in the dimension place. Results explain that plant communities (specially numbers 7and 8) are distincted by some different charactristics such as cover, frequency, stratification and diversity.

Exotic conifers species area desirable point of view and particular characteristics have been planted in wide areas of Iran to test adaptability vigur many years ago. There is a small stone pine (Pinus pinea) stand with 14 years old seeding in 4 * 4 m spacing in Chamestan research station. Stone pine stand's d.b.h., total height, pruning height factors were measured and analyzed with climatology and ecology information in 1997. The results are as follows: Average diameter at breast height is 16.75cm and total height 5.7 m and average volume per hectare is 35.66 cubic meters. Average growth in diameter (D.B.H) is 12mm and height growth is 42 cm and growth in column is 2.5 cubic meter. Pruning height is 84 cm and survival percentage of seedlings is %70. Regard to average growth, survival percentage and adaptation of stone pine species we command the afforestation of this species in sandy soil near coastal in north of Iran.  

To investigate the effects of provenance and age variations on wood properties of eastern cottonwood (Clone 77/51), disks were cut at the breast height of 12 eastern cottonwood trees, collected from Gillan (Safrabasteh) and Mazandaran (Chamestan) research projects by a random sampling method. Average growth rate of Chamestan trees was the highest because of better conditions of the provenance (e.g., soil, temperature, etc.). Age caused more variation in fiber dimensions. The highest fiber length mean was 0.995 mm for 18 years old Safrabasteh trees. Optimum age for tree harvesting of this clone was found to be 9-10 years by statistical analysis method. Variation in tree age had statistically significant effect on oven dry density, but it did not have significant effect on basic density. Provenance variation did not bring about significant differences in chemical composition, except in cellulose content. The results also showed that variation in tree age had more effects on wood characteristics of this clone than variation in provenance.

The trial was carried out in 1983, using three fast growing species including E. camaldulensis, E. saligna and E. viminalis at Chamestan - Noor Natural Resources Experimental Station. The altitude, latitude and longitude are 85 m. above sea level, 36°, 30' North and 52°, 5' east, respectively. Average annual rainfall is 840 mm. Average daily and absolute maximum and minimum air temperature are 15.8,36 and - 8°C, respectively. The measured tree parameters were: Survival, height, diameter and stem quality. The data statistical analysis was made, using the measurement in 2003. The SPSS software and t - test were used for the data analysis. The best species in view point of survial, diameter, height and quality were E. camaldulensis, E. viminalis and E. saligna (both parameters), respectively.

A 19 year old plantation (4x4m) 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/Smm- mean of annual height increment = 80cm- mean of annual volume increment =21155m3- hid coefficient = 47/6The diameter class of30-35 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.

Following investigation was carried out to identify some of Ascomycetes collected from Mazandaran forest. During different seasons of the year, the specimens were collected from Vaz forest which is located in Chamestan, and were studied in the laboratory. After staining the samples, microscopic characters of them such as the form and size of the ascus, ascospore and paraphysis were drawn and determined.Afterwards, the specimens were identified, being referred to the available references. The results of the identification of the collected fungi ended to the report of four new species for Iran for the first time. These species which belong to the order of Helotiales and family of Helotiaceae are as follows:Neobulgaria pura (Fr.) Petrak Ascocoryne cylichnium (Tul.) Korf Bisporella citrina (Batsh ex. Fr) Korf and Carpenter Chlorociboria aeruginascens (Nyl.) Karst.

Mixed plantations of nitrogen fixing trees is one method of improving soil fertility after successive harvests of fast growing trees. Soil properties were studied in 7- year old pure and mixed plantations of Populus deltoides Marsh. and Alnus subcordata C.A.Mey near Chamestan in north of Iran(Caspian region). Total nitrogen was higher in 15-30 cm soil layer under pure Alnus subcordata forest as compared with a mixture of 67% Populus: 33% Alnus ar 50% Populus: 50% Alnus or 33% Populus: 67% Alnus or 50% Populus: 50% Alnus. However, soil pH, EC, organic matter, available P, K, Ca, and Mg were statistically the same in these pure and mixed plantations. Finally, we can conclude that the use of mixed plantation of A. subcordata as a nitrogen fixing tree with P. deltoides on soil physico- chemical properties up to 7 years of age.