Evaluation of trophy status of Aynak wetland in Rasht using Carlson index

Subject Areas :

Mohammad Dehdar Dargahi ¹ (Department of Environment, Lahijan Branch, Islamic Azad University, ,Lahijan, Iran)
Mohammad Reza Rahimibashar ² (Department of Marine biology, Lahijan Branch, Islamic Azad University, Lahijan, Iran)
Reza Zamani ³ (Department of Environment , Lahijan Branch, Islamic Azad University, Lahijan, Iran)
Pouya Rahbari ⁴ (Expert of Gilan Provincial Office, Department of the Environment, Rasht, Iran.)

Received: 2022-03-29 Accepted : 2022-05-16 Published : 2022-02-20

Keywords: Aynak wetland, Rasht, Carlson TSI, : Eutrophication,

Abstract :

AbstractNutrition or enrichment is an important issue in all aquatic ecosystems of the world and wetlands are one of the most sensitive habitats to this problem and assessing the trophic status of a wetland is the first step in assessing its quality. The aim of this study was to investigate the water quality characteristics and nutritional status of Ainak wetland in Rasht using the Carlson trophy index. The area of this water zone is 36.5 hectares and its water supply source is rainfall and urban wastewater and Sefidrud river. This wetland is located in the west of Rasht metropolis and consists of four different parts. In order to determine the physicochemical factors of water in each section of a station, sampling and sampling from autumn 1396 to summer 1397 were performed seasonally in them during a year and the annual average of the factors showed that: water temperature 3 times / 18 ° C, pH equal to 7.21, Water soluble oxygen 2.75 mg / L, BOD59 / 10 mg / L, COD42 / 24 mg / L, TDS25 / 733 mg / L, total nitrogen 21.5 mg / L, chlorophyll A 0.062 mg / L, total phosphate 0.95 mg / L, depth Disk visibility was 0.35 meters. The average annual Carlson trophy index of this wetland was determined based on the depth of viscous disk viscosity 76.78, total phosphate 99.80 and chlorophyll A 69.74. It has a fundamental action to improve nutritional conditions.