Background and Objective: Surveying of Balekhloo River’ s water is necessary because it is one of the main branches of Gharasoo River in Ardabil and supplying water for Yamchi dam Due to the presence of contaminant sources such as wastewater, residential areas, and industrial, agricultural and mineral water, river morphology. Today evaluation of water quality based on macro invertebrates variety has completed chemical methods of pollution recognizes. Method: In this study water quality examination of Balekhloo River in Ardebil, macro invertebrates were sampled in 5 stations along the river in 2 times of year (low water season and high water season). For results’ simulation measuring of some physico chemical parametres were perfomed. Macro invertebrates were identified and evaluated with Shannon winner variety index, Margalef biotic index and Pielou similarity index. Findings: In this study, ten orders of invertebrates in 23 categories were identified and counted and result simulation laboratory measured of physico chemical parameters like DO, Nitrate, PH, Debi and velocity. Discussion and Conclusion: Results showed that there are similarities between physical, chemical and biological indexes and Margalef biotic index was known more suitable bio assessment index to determine water quality in Balekhloo River. Finally, by comparison of physical, chemical and bio index parameters of Balekhloo River’ s water quality was classified into three region low, moderate and high pollution.

Background and Objective: Land degradation modeling is one of the environmental impact assessment methods that quantitatively represents the effects of human activities. The purpose of applying this model is to identify the destruction factors and susceptibility degree in ecosystems in order to prevent further destruction by other projects and to show the feasibility of future development to decision markers. Method: The study area was firstly partitioned into 94 cells (1600 ha) and then 14 degradation factors along with their intensity were identified using land use map, field observations and expert views. Ecological susceptibility and physiological density were then determined and all cells were classified into four categories as recommended for development, required for reconstruction, required for protection and cells with no development potential based on fuzzy theory. Findings: The results show that 22 cells (23. 40% of the total area) out of 94 cells require reconstruction, 37 cells (39. 36% of total area) have no development potential, and 35 cells (37. 22% of total area) are recommended for development. Discussion and Conclusion: The effects of destructive activities in this region (that is mainly due to the detrimental effects of tourism activities) were evident, so that the destructive activities such as change in land use and land cover, on the one hand, and waste and rivers pollution, on the other hand, were found as the main causes of destruction in the region. Out of 94 cells, 21 cells and 16 cells had no development potential due to faults and due to being in Binalood protected area respectively. 35 cells are recommended for development in first to third priorities; these cells are in low physiological density area. 22 cells, due to high physiological density and severity of the destructive agents, have a high degradation coefficient and need to be reconstructed, and therefore should be excluded from any future development.