Vertical distribution characteristics of phytoplankton functional groups and their relationships with environmental factors in Lake Basomtso, Tibet, China

被引：0

作者：

An R. ^{[1
]}

Pan C. ^{[1
]}

Taba L. ^{[2
]}

Yang X. ^{[3
]}

Ba S. ^{[1
]}

机构：

[1] Laboratory of Wetland and Catchments Ecology in Tibetan Plateau, Faculty of Natural Sciences, Tibet University, Lhasa

[2] Teaching Site of Naitong Village, Yueba Township, Kharo District, Qamdo City, Tibet Autonomous Region, Qamdo

[3] Institute of Fisheries Science, Tibet Academy of Agriculture and Animal Husbandry, Lhasa

来源：

Hupo Kexue/Journal of Lake Sciences | 2021年 / 33卷 / 01期

关键词：

Environmental factors; Functional group; Lake Basomtso; Phytoplankton; Vertical distribution;

D O I：

10.18307/2021.0114

中图分类号：

学科分类号：

摘要：

In order to understand vertical distribution characteristics of phytoplankton functional groups and their relationships with environmental factors in the lakes of the Qinghai-Tibet plateau, this paper takes Lake Basomtso, which is one of the biggest alpine glacier lakes in southeast Tibet, as the research object, a total of 84 samples were collected from seven vertical stratifications by using vertical stratified sampling of phytoplankton in the center of the lake with hammer hung deep water samplers in the dry ( November 2017) and wet ( September 2018) seasons. Using the methods of phytoplankton functional group, correlation analysis and redundancy analysis (RDA), the vertical distribution characteristics among functional groups of phytoplankton in Lake Basomtso and its relationship with environmental factors were studied. The results showed that: 1) Lake Basomtso exhibited highly water stable, and the water temperature is obviously stratified. The thermocline is located at a water depth of 30-60 m in the dry season, and the double thermocline is located at a water depth of 1-15 m and 30-60 m in the wet season. 2) The phytoplankton community in Lake Basomtso was identified with 242 species from 7 families, 76 genera, and the species composition was bacillariophyta-cyanophyta-chlorophyta. 3) According to the functional group classification method of the phytoplankton, it can be divided into 25 functional groups, respectively, A, B, C, D, E, F, G, H1, H2, J, MP, LM, LO, M, N, P, S1, S2, T, W1, W2, X1, X2, X3 and Y, the dominant function groups change from MP, D, LO and P in the dry season to D, F, LO, MP, N and P in the wet season; MP functional group is the absolute dominant group of phytoplankton community in Lake Basomtso. 4) RDA results showed that the vertical distribution characteristics of phytoplankton functional groups were significantly affected by environmental factors in the different water regimen periods. On the whole, pH, total nitrogen and ammonia nitrogen were the main environmental factors affecting the distribution pattern of phytoplankton functional groups. © 2021 by Journal of Lake Sciences.

引用

页码：86 / 101

页数：15

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