Journal of Guangxi Normal University(Natural Science Edition) ›› 2026, Vol. 44 ›› Issue (5): 168-178.doi: 10.16088/j.issn.1001-6600.2025111601

• Ecology and Environmental Science Research • Previous Articles     Next Articles

Characteristics of benthic diatom community structure and water quality assessment in Huixian Karst Wetland, Guilin, China

Lin Kang, Cai Desuo*, Ma Xinyu, Yang Tao, Chen Yuzhi   

  1. School of Hydropower and Environment, China Three Gorges University, Yichang Hubei 443002, China
  • Received:2025-11-16 Revised:2025-12-26 Online:2026-09-05 Published:2026-07-24

Abstract: Huixian Karst Wetland, the largest karst wetland inlow-altitude regions of China, plays a crucial role in promoting the healthy circulation of ecosystems, regulating urban climate, and purifying the water quality of the Li River.Diatom indicesis used to evaluate the water ecological health status of HuixianKarst Wetland,and 16 representative sampling sites were established in July 2024 across the surface waters of the Shiziyan Underground River System (SZ), the Ancient Guiliu Canal (GL), the Muzong Lake Dispersed Discharge System Waters (ML), and the Muzong River (MR). The results indicated that: ① A total of 29 genera and 124 species of benthic diatoms were identified in the Huixian Karst Wetland, with three common dominant species across all water bodies. Nutrient-sensitive and eutrophication-preferred species, such asNitzschia palea andMelosira varians, were the primary dominant and indicator species in the wetland. ② Canonicalcorrespondence analysis (CCA) and Mantel test results indicated that total nitrogen (TN) and total phosphorus (TP) were the primary environmental factors influencing changes in the benthic diatom community in the Huixian Karst Wetland, with ammonia nitrogen (NH+4-N), calcium ions (Ca2+), dissolved oxygen (DO), and conductivity (Cond) serving as important influencing factors. ③ Specific pollution sensitivity index (IPS), hurlimann trophic index (DI-CH), and trophic diatom index (TDI), selected through cluster analysis, non-metric multidimensional scaling (NMDS), and box plot analysis, can serve as reference biological indicators for water quality assessment in the Huixian Karst Wetland. ④ Comprehensive water quality evaluation based on the three indices revealed that the overall water quality of the Huixian Karst Wetland is poor, with only43.7% of sampling sites rated as “moderate” or “good”,while 56.3% were rated as “poor” or worse. The overall water quality status across different water bodies showed ML > MR ≈ SZ > GL.

Key words: water quality assessment, diatom indices, benthic diatom, community structure characteristics, environmental factors, Huixian Wetland, Guilin, China

CLC Number:  X824;Q948.8
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