论文部分内容阅读
于2009年5、8、10和12月对珠江口广州海域叶绿素a和环境相关因子进行了取样调查,分析了广州海域叶绿素a的时空变化特点及其分布的环境调控因素。结果表明,广州海域水体中叶绿素a变化范围为1.43～86.9μg/L,平均含量为20.7μg/L,最高值出现在夏季的N1站位,为86.9μg/L,最低值出现在春季的N8站位,为1.43μg/L。各站位叶绿素a年平均浓度从上游到下游表现出明显的递减趋势,以N1站位浓度最高(38.54μg/L),N7站位浓度最低(7.44μg/L),相差5.2倍。调查海域叶绿素a的季节变化明显,呈单峰型,总体上表现为夏季﹥秋季﹥冬季﹥春季。根据叶绿素a浓度对广州海域富营养化状态进行评价,15.6%的监测站位处于低度富营养化,50.0%处于中度富营养化,28.1%处于高度富营养化,6.3%处于过度富营养化,总的来讲,以中、高度富营养化状态为主体。叶绿素a浓度与NO3--N浓度、温度呈现出一定的正相关关系(分别为:r=0.374,p<0.05;r=0.502,p<0.01),与盐度、溶解氧呈现出一定的负相关关系(分别为:r=-0.433,p<0.05;r=0.455,p<0.01)。与国内其他近岸海域(河口)相比,珠江口广州海域叶绿素a浓度处于较高水平,仅低于深圳湾。
In the May, August, October and December in 2009, chlorophyll a and environmental related factors in Guangzhou waters of the Pearl River Estuary were sampled and analyzed. The characteristics of temporal and spatial variation of chlorophyll a in Guangzhou sea area and its environmental regulation and control factors were analyzed. The results showed that chlorophyll a in Guangzhou waters varied from 1.43 to 86.9 μg / L with an average content of 20.7 μg / L, and the highest value appeared at station N1 in N1 summer in summer, reaching 86.9 μg / L, with the lowest occurring in spring N8 Station, 1.43μg / L. The average concentration of chlorophyll a at each station showed a decreasing trend from upstream to downstream. The highest concentration of N1 (38.54μg / L) and the lowest concentration of N7 (7.44μg / L) were 5.2 times. The seasonal variation of chlorophyll a in the surveyed sea area was obvious with a single peak, showing as a whole summer> autumn> winter> spring. According to the assessment of eutrophication in Guangzhou sea area, 15.6% of the monitoring stations are in low eutrophication, 50.0% are in moderate eutrophication, 28.1% are highly eutrophic and 6.3% are in eutrophication In general, with the medium and high levels of eutrophication as the main body. There was a positive correlation between chlorophyll - a concentration and NO3 - N concentration and temperature (r = 0.374, p <0.05, r = 0.502, p <0.01, respectively) (R = -0.433, p <0.05; r = 0.455, p <0.01, respectively). Compared with other coastal waters in the country (estuaries), chlorophyll-a concentration in Guangzhou waters at the Pearl River estuary was at a high level, only lower than Shenzhen Bay.