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黄河上游玛曲段春季浮游生物群落结构特征

张军燕1;张建军2;杨兴中1;李科社2;沈宏保2;冯慧1;李芳1   

  1. 1西北大学生命科学学院, 西安 710069;2中国水产科学研究院黄河水产研究所, 西安 710069
  • 收稿日期:2008-08-17 修回日期:1900-01-01 出版日期:2009-05-10 发布日期:2009-05-10

Characteristics of plankton community structure in Maqu section at upper reaches of Yellow River in spring.

ZHANG Jun-yan1;ZHANG Jian-jun2;YANG Xing-zhong1;LI Ke-she2;SHNEG Hong-bao2;FENG Hui1;LI Fang1   

  1. 1College of Life Sciences, Northwest University, Xi’an 710069, China;2Yellow River Fishery Research Institute, Chinese Academy of Fishery Sciences, Xi’an 710069, China
  • Received:2008-08-17 Revised:1900-01-01 Online:2009-05-10 Published:2009-05-10

摘要: 为了了解黄河上游玛曲段的水质状况,于2006年4—5月对黄河玛曲段干流浮游生物的群落组成进行了调查。结果表明:全段的浮游植物共有5门23种(属),浮游植物密度为3.2×104~54×104 cells·L-1,平均密度为19.7×104 cells·L-1,生物量为0.069~0.464 mg·L-1,平均生物量为0.228 mg·L-1,其中密度最高的为齐哈玛,生物量最高的为玛曲大桥;浮游动物共有2门10种(属),密度为670~1273 cells·L-1,平均为881.56 cells·L-1,生物量为0.044~0.089 mg·L-1,平均为0.064 mg·L-1;该河段浮游生物组成多以冷水性为主;浮游植物多样性指数介于2~3,表明黄河上游玛曲段水质呈轻度污染;浮游生物丰富度与均匀度值均较低,群落结构组成不稳定,易受外界环境的干扰。

关键词: 同龄纯林, 自疏规律, 密度变化, 遗传算法

Abstract: In order to understand the status of water quality in Maqu section at the upper reaches of Yellow River, the plankton community composition was investigated from April to May 2006. Twenty three species (genera) and 5 phylum of phytoplankton were observed in the whole section. The density of the phytoplankton was 32 ×104〖KG-*2〗-〖KG-*7〗54×104 cells·L-1, averaging 197×104 cells·L-1, and the biomass of the phytoplankton was 0069〖KG-*2〗-〖KG-*7〗0464 mg·L-1, averaging 0228 mg·L-1. The highest density was in Qihama, and the highest biomass was in Maqu Bridge. At the same time, 10 species (genera) and 2 phylum of zooplankton were observed. The density of the zooplankton was 670〖KG-*2〗-〖KG-*7〗1273 cells·L-1, averaging 88156 cells·L-1, and the biomass of the zooplankton was 0044〖KG-*2〗-〖KG-*7〗0089 mg·L-1, averaging 0064 mg·L-1. The composition of plankton in Maqu section was mainly of cold-water type, and the phytoplankton diversity index ranged from 2 to 3. These results suggested that in Maqu section, the water quality was of slightly polluted, the richness and evenness of plankton were lower, and the composition and structure of plankton community were instable, being easily disturbed by external environment.

Key words: Even-aged pure stands, Self-thinning rule, Density change, Genetic algorithms