جستجوی مقالات مرتبط با کلیدواژه "بانکت هلالی" در نشریات گروه "جنگلداری"

Severe drought stress restricts the growth of plant species such as oak trees and at the onset of weakness, invasion of pests and diseases and ultimately death is inevitable. The use of rainfall storage techniques provides the water needed for plant growth in the soil. This study aimed to examine the possibility of using two small water catchment (Linear terrace and Crescent pond), to cope with the critical conditions of oak forests, located in Chavar section of Ilam province; comparing to the control (without storage) in a randomized complete block design. Before running the storage systems, trees characteristics, as well as soil and moisture content were measured and during the 4-year period, monthly soil moisture and health status of the trees were recorded. Experimental results showed that soil moisture decreased in proportion to the amount of rainfall in the low season, so that in hot months, the moisture loss crisis reaches even more than one meter deep. Comparison of mean soil moisture changes showed significant effect of rain storage methods on soil moisture content by 21% in linear banquet method and 39% in crescent banquet method. Evaluation of the degree of vitality and health of the trees showed that there was a significant difference between the treatment of rainfed storage and the control treatment at 95% confidence level, indicating the positive effect of the rainfed storage on the health of the trees. Therefore, the use of water catchment systems to store the precipitation is recommended to increase soil moisture and improve the health and vitality of the declined trees.

Pilu (Salvadora oleoides Decne.) is a shrub or a small tree indigenous to southeast of Iran and is known as a multipurpose species for forage production, soil protection and medicinal value, which altogether reveal its importance in forestry and reforestation projects in warm and arid areas. The purpose of this study was to investigate the effects of runoff and moisture storage methods in the soil (Bankette arches, pan (control), plastic sheets, straw in the bottom of the pit, superabsorbent polymers and canopy) on the establishment, survival and growth of the pilu species in Southeast of Jazmurian in Sistan and Baluchestan province. The factors studied in this experiment included seedlings survival, seedling height, seedling crowns, seedling collar diameter and seedling vigor, which were measured in the middle of March, 2017. The results showed that the development of plastic layer improved the survival rate and seedlings cover. Creating a shadow increases the height growth and slenderness coefficient of seedlings and decreases the diameter growth of seedlings. In general, it can be concluded that planting plastic surfaces on the surface of the pit and planting canopies on seedlings are the most suitable treatments with respect to the percentage of seedling's survival and seedling growth characteristics. It seems that combination of these two treatments could help to improve seedling establishment across similar areas.