جستجوی مقالات مرتبط با کلیدواژه « Compatibility » در نشریات گروه « جنگلداری »

Urbanization and population growth increased the demand for wood, which can be partially supplied via wood culture. Poplar plantation with fast growing clones of poplar is thus required to investigate their compatibility and wood production potential. This study was carried out with 12 treatments (11 new clones and one control clone) and three replications in a Randomized Complete Block designto determine the compatibility and wood production in Lasht-e Nesha agriculture research station in Gilan province. In each experimental plot, 12 one-year-old seedlings were planted at a 4×4 m distance. Then the diameter growth, height, volume and survival percentage of trees were calculated, followed by a statistical analysis. The results showed good compatibility of all clones, yet with different growth quantities. The P. x. Intreramericana, P. d. Marquette, P. d. 92.258, and P. e. Ita199 with diameter of 12.8, 12.35, 10.58 and 9.42 cm and height of 11.08, 12.58, 12.22, and 10.76 m were superior compared to the control clone (diameter = 9.65 cm, height=10.62 m and volume =5.83 m³/ha). In addition, the volume production of the studied as well as the control clones were 9.35, 9.76, 6.84 and 5.11 m³ha-1 year-1 in a five year period, respectively. The survival percentage of the clones were different, with the lowest survival rate =66.6 % for P. e. Blanc de Poitou and the highest rate of 97.2 % for P. e. 45.51, P. e. 92.160, P. d. Marquette and P. e. 87m119. The clones surveyed here can therefore be introduced as competent and successful clones in the comprehensive program of agri-wood development across the study site.

In order to compare adaptability and growth of Pinus elliottii and P. radiata, the trial was conducted in 1995 at Chamestan-Noor Forest and Rangeland Experimental station (Caspian Sea of Iran). The seedlings of two species were planted in separate groups. Each stand area was 7500m2. In addition, determination of survival and measurements of quantity accomplished (for five years). After 10 years, parameters such as survival, quantity and quality are determined. Finally, data with T-test method in SPSS are analyzed. Species comparisons showed that P. elliottii survival (75%) is more than P. radiata survival (57%) in the studied area. The mean diameter at breast height (D.B.H) of Slash pine and Monterey pine were 15/4 and 15.5 centimeters, respectively. Also mean height of Slash pine and Monterey pine were 11.1 and 9.5 meters, respectively. Analysis of mean height and diameter demonstrated that there were no significant difference for diameter growth between P. elliottii and P. radiata. However, there was significant difference for height growth between two species. Furthermore, volume per ha for P. elliottii 190 sylve and for P. radiata 91 sylve were determined. Comparison of two pines revealed that Slash pine (P. elliottii) grows faster and is more resistant than Monterey pine (P. radiata) in the Chamestan region. Thus, Slash pine for plantation with aim of wood production and using of fast growing species is proposed.