جستجوی مقالات مرتبط با کلیدواژه "seimareh" در نشریات گروه "کشاورزی"

The quality of surface water within a region is mainly influenced by natural processes such as precipitation, soil erosion and weathering, geology, vegetation and anthropogenic activities. The most important factor is geological formation in watershed and water flow path. In this study, the spatial variations of physical and chemical parameters of surface water including EC, SAR, Cl and TDS and factors influence on water quality were investigated in the Seimareh and Kashkan rivers in Ilam and Lorestan provinces. For this purpose the water quality data sets collected from the 14 hydrometric stations along the rivers during the 1-year (2009-2011) and analyzed. So the accuracy of the geostatistical interpolation methods such as kriging (OK), cokriging, and deterministic methods like inverse distance weighting (IDW) and radial basis function (RBF) in mapping of the studied parameters were evaluated. The result showed that based on the RMSE criteria, for all studied parameters, kriging and cokriging methods were showed lower RMSE while between deterministic methods, RBF is better than other interpolation techniques. The investigated variatins of physical and chemical parameters of surface water quality revealed the causes of increasing amount of physical and chemical parameters in Kashkan River and its tributaries were related to impact of geological formations in the region especially Gachsaran and Aghajary.

Study of fishes on aquatic ecosystems in many respects, including ecology, behavior, biology, conservation and management of water resources, exploitation of resources and training are important. So in the autumn 2011, the population structure of Barilius mesopotamicus was studied. In this order, 69 samples of the mentioned fish from seimareh (34 samples), Changoleh (20 samples) and Siahgave (15 samples) rivers caught by electrofishing. Twenty nine morphometric and seven meristic characters were analysed. Morphological characteristics were standardized before statistical analysis to reduce the error of the allometric growth in morphological characteristics, nine factors were indicators of 73.73% characteristics diversity and in meristic characteristics two factors were indicators of 74.11% characteristics diversity between people of three populations. Ten morphometric characters and four meristic characters had significantly showed the difference between populations. Although, The Principal component analysis (PCA) and canonical variables analysis(CVA) showed a relative overlap Barilius mesopotamicus populations in Seymareh and Changoleh rivers, the siyah gav,s population located in a separate group. The results of this study showed that the morphometric and meristic characters could be separated the Changoleh and Seymareh rivers from Siyah gav population very well.