|
Evaluation of the tophic state in a wetland ecosystem using a combination of trophic index, multivariate technique and data-driven models
|
Rahmat Zarkami   , Maryam Nazarinezad , Ali Abedini |
| University of Guilan |
|
|
Abstract: (33 Views) |
In the present study, the trophic state of the four main parts of Anzali wetland was determined using a combination of trophic state index (Carlson), multivariate techniques (principal component analysis) and data-driven models (classification tree). Monitoring was carried out monthly in different parts of the wetland for one year (1400-1401) with three repetitions at each sampling site. Based on the results of the Carlson trophic state index (TSI), all parts of the wetland were classified as a hypereutrophic. The eastern and central parts of the wetland had the highest (89.34) and lowest indices (72.93), respectively. The average TSI in the entire wetland (23.81) showed that all parts of the wetland were also classified as a hypereutrophic. A decrease in the ratio of total nitrogen (TN) to total phosphorus (TP) in the east of the wetland (6.34), Pol Ghazian (7.12) and the center of the wetland (8.30) is an indication of TN limitation. On the contrary, the high ratio in the west of the wetland (12.49) is an indication of TP limitation. The low average ratio of TN to TP in four different parts of the wetland (8.56) indicated that there was TN limitation in the entire wetland. According to the biplot of the principal component analysis (in the first component), the most influential factors in the process of eutrophication in the wetland were chlorophyll-a, water temperature and total phosphate, respectively, which played a role mostly in the warm seasons of the year. According to the prediction of the "decision tree" model, the increase in the amount of total nitrogen, total phosphorus, chemical oxygen demand and chlorophyll-a and the decrease in water transparency played a role in the increase in eutrophication in the wetland.
|
Article number: 2 |
| Keywords: wetland, eutrophication, nutrients, trophic state index, classification tree model |
|
|
Full-Text [PDF 784 kb]
(13 Downloads)
|
Type of Study: Research |
Subject:
Special
Received: 2024/04/8 | Accepted: 2025/08/9 | Published: 2025/08/17
|
|
|
|
|
|
|
| Send email to the article author |
|
|
|
| Add your comments about this article |
|
|
|
