نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی آبیاری و آبادانی، دانشکده کشاورزی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران
2 گروه جنگلداری و اقتصاد، دانشکده منابع طبیعی کرج، دانشگاه تهران، کرج، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Introduction: Vegetation can be very effective in this direction and be fruitful in the direction of reducing atmospheric pollutants and sustainable development in any country. Some pollutants such as carbon monoxide, ozone can cause destructive effects on vegetation for many plants. Especially in arid and semi-arid areas, the needles are suitable for reforestation and reducing environmental pollutants.
Materials and Methods: The pollutants examined in this study are included: suspended particles in the atmosphere with a size of 2.5 microns, 10 microns, NOX, NO2, NO, CO and O3. Seasonal effects have also been considered in this research, which has been analyzed using two-way analysis of variance table and the mutual effects of pollutants in different seasons.
Results and Discussion: The effects of carbon monoxide in the spring season on the process of photosynthesis of vegetation in Chitgar Forest Park have been estimated to be negative. Since the balance must be maintained in the totality of the elements of photosynthesis, therefore, the excessive increase of carbon monoxide in the Chitgar Forest Park has negative effects on the photosynthesis of vegetation; on the other hand, these negative effects have been seen in autumn and winter. In winter, this value is higher than other seasons. One of its causes can be mentioned the temperature inversions in the region, which has more negative effects on the region's ecosystem due to the stillness of the air and the greater accumulation of this pollutant in the Forest Park Complex.
Conclusion: The highest percentage of correlation is obtained in the winter season with the amounts of ozone and carbon monoxide and the chlorophyll fluorescence of the sun. In previous studies, different combinations of forest plants and conifers and broad-leaved species have been studied and combined with pollutants such as PM2.5, PM10, or sulfur dioxide, but in this study, the discussion of two influential elements is carbon monoxide. Nitrogen oxide on the coniferous species of Chitgar forest park complex has been discussed and investigated. In addition, in the study conducted, the highest correlation percentage of sunlight chlorophyll fluorescence has been calculated on these two elements, and it was calculated in the winter season with an R² value of 93/16%, a P-value of 0/013, and an RMSE value of 4/7 mg/m2. The effects of this element are also quite evident in the winter season. Among the reasons for this can be the expansion of urbanization, exposure to pollutants in the direction of the prevailing wind (west to east) from Alborz to Chitgar forest park complex, temperature inversion, lack of sufficient standard fuel for cars. Lack of careful monitoring of the technical inspections of used cars, population growth, human activities contrary to environmental principles, lack of attention to climate change and one of its effects is global warming and the subsequent increase in greenhouse gases due to the increase in activities. The low correlation percentage of two elements with chlorophyll fluorescence in the autumn season and 63/25% correlation with P-value 0/197 and RMSE 9/6 mg/m2 have been calculated. In this season, due to the presence of drought stress, increase in temperature and increase in evaporation from the soil and plant surface, as well as the delay in the beginning of autumn rains in the country, due to the elevation of the subtropical belt (the northern limit of the Hadley cell), which according to the bulletins in the last 20 autumns of the last 14 autumns, the country's meteorological organization has started its rains with a delay, which is the proof of this claim.
کلیدواژهها [English]
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