List of Articles Harvesting

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  1 - Investigation of Loss of Extracted Wood, Biomass and Carbon Storage of Commercial Trunk of Hornbeam and Date-plum Species in Astara Forests
  Seyede Nasrin  Ghaznavi
  In current study, in order to accurately estimate of the volume, loss of extracted wood, biomass, carbon sequestration and extraction of allometric equations of hornbeam and date-plum species, 17 trees from each of the mentioned species in parcel 729 of the series seven More

  In current study, in order to accurately estimate of the volume, loss of extracted wood, biomass, carbon sequestration and extraction of allometric equations of hornbeam and date-plum species, 17 trees from each of the mentioned species in parcel 729 of the series seven of the watershed number one of Astara forests were selected and after measuring the diameter and height their volume measured, using volume equation. The selected trees were then fallen and the volume of trees measured again. Finally, after converting trees trunk into smaller portable parts by mules, the volume of extracted wood was measured again and statistically compared with analysis of variance. Also, after weighing the fresh weight of the total parts, 4 cm disc samples were taken from the diameter in breast height of the trees and after weighing the initial weight and drying the samples in the oven at 80 ° C, the samples biomass were calculated. Carbon stock of the samples was measured by burning method in an electric kiln and the amounts of biomass and carbon sequestration were generalized to all trees. The allometric equations of the biomass of the two species were also extracted using the exponential function. Based on the results, the average loss of hornbeam and date-plum wood was estimated to be 42% and 32%, respectively. The total reserves of carbon and carbon dioxide deposited by the two species were estimated at 60 and 220 tons per hectare, respectively. In addition, the extracted allometric equations provided a high coefficient of explanation (>0.9) for both species. The results of the present study show the high loss of extracted wood and the high accuracy of the extracted allometric equations in estimating the biomass of the studied species. Manuscript profile
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  2 - Investigating of environmental impact assessment of mechanical and biological control in order to control the biomass of aquatic plants in Anzali Wetland (Case study: West Wetland)
  طوبی عابدی shamim moghadami
  The purpose of environmental impact assessment is to identify, analyse and evaluate project activities. Environmental Impact Assessment ensures the environmental concept of sustainable development by providing the necessary environmental information to determine the env More

  The purpose of environmental impact assessment is to identify, analyse and evaluate project activities. Environmental Impact Assessment ensures the environmental concept of sustainable development by providing the necessary environmental information to determine the environmental friendliness of a proposed project. Mechanical harvesting of aquatic plants along with biological and reed harvesting in the whole area of West Wetland and opening the entrance of Chafrud River were the main activities that could be implemented in this project. Mechanical harvesting operations are performed with a Harvester machine and reed harvesting is done with a motor saw or manually. The most important activities of the project are mechanical harvesting (reed harvesting and immersion of aquatic plants floating with the Harvester machine), restoration and cleaning of waterways (Chafrud River), dewatering and rehabilitation of West Wetland, biological control and operation of wooden bridge and bird watching station. Environmental parameters, consequences and nature of the effect, impact time, magnitude of the effect and the scope of the effect were investigated and the positive and negative effects of the design were determined. Manuscript profile
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  3 - The efficacy of multivariate regression models and GIS in Selecting SuitableSites for Rain Water Harvesting (Case Study: Tajareh Watershed)
  maryam aghaie siamak dokhani ebrahim omidvar
  20.1001.1.26763060.1401.7.12.1.3
  Water scarcity in arid areas is a serious crisis. The most important step in using rainwater collection systems is to locate suitable areas. In this research, three methods of multivariate regression model and GIS have been used to locate the on-site and off-site rainwa More

  Water scarcity in arid areas is a serious crisis. The most important step in using rainwater collection systems is to locate suitable areas. In this research, three methods of multivariate regression model and GIS have been used to locate the on-site and off-site rainwater collection method in Tejreh watershed. In this study, canopy, litter, rock and gravel, bare soil, CN, precipitation, slope and soil depth as independent variables and influence on in situ rainwater collection and maximum instantaneous discharge for non-in situ rainwater collection method The title of the dependent variable was considered. The multivariate regression model uses stepwise method, backward removal method, and forward method. And the standard step-by-step method, regression removal method, step-by-step method in collecting rainwater, non-in situ method have been used. The final results by matching the results of previous research show in step rainwater collection, stepwise method and between layers CN, soil, percentage of rock and gravel, and in non-in situ rainwater collection stepwise regression method Standard and among layers the percentage of litter, percentage of canopy, CN, slope, percentage of rocks and pebbles, amount of rainfall, percentage of bare soil and soil depth are known to be important in the equation. Finally, the importance of rain collection sites was divided into four classes: very good, good, medium and poor. Manuscript profile