| Abstrakt: |
The aim of this study was to investigate the quantity of energy input, compare the energy flow and the quantity of greenhouse gas emissions between wheat and barley ecosystems, in the cities of Tehran province. The needed information was collected by questionnaire method from farmers in Tehran province cities. Then, energy indices, different forms of energy and global warming potential were calculated. The results showed that the highest input energy in the production process of wheat and barley belonged to Islamshahr city with 86159 and 76793.9 MJ ha-1, respectively. In addition, the most direct energy, renewable energy and non-renewable energy belonged to wheat and barley farms in Islamshahr and Rabat Karim cities. Wheat and barley farms in Tehran had the most indirect energy. On the other hand, the lowest quantity of different forms of energy in the wheat and barley ecosystems belonged to the rainfed farms of Tehran province located in cold regions. In general, in wheat and barley ecosystems of Tehran province, the share of direct energy was more than indirect energy and the share of non-renewable energy was more than renewable energy. The quantity of greenhouse gas emissions in wheat and barley farms in the western cities of the province, including Islamshahr equivalent to 10474.5 and 10081 kg eq. CO2 per ha respectively. Therefore, by taking into account the climatic conditions of the region and managing the consumption of production inputs, it is possible to increase the efficiency of energy consumption and reduce the emission of greenhouse gases in Tehran province. [ABSTRACT FROM AUTHOR] |
