摘要:根據2010年5月至2011年4月期間江西瑤湖水質監測指標的分析數據,利用Q型聚類分析的方法將9個監測點分成兩類區域,在此基礎上探討了水體中葉綠素a的時空分布規律。結果表明,全湖葉綠素a含量的年平均值為25.82 mg/m3,各監測點的變幅為1.59~142.68 mg/m3;在時間上,水體中葉綠素a含量總體上呈現春、夏和秋季持續升高,冬季降低的趨勢;在空間上,水體中葉綠素a含量存在顯著性差異,其隨著營養鹽含量的減少而不斷降低。采用Pearson指數分析的方法進一步考察了水體中葉綠素a與環境因子之間的相關性,研究顯示,水體中葉綠素a與水溫(或溶解氧)、營養鹽(總磷、亞硝酸鹽氮、氨氮)和pH具有較高的正相關,而與透明度具有較高的負相關。
關鍵詞:葉綠素a;時空分布;環境因子;相關性;瑤湖
中圖分類號:Q178;X171.1 文獻標識碼:A 文章編號:0439-8114(2013)17-4069-04
Temporal and Spatial Distribution of Chlorophyll-a in Yao Lake and
Its Correlation with Environmental Factors
JIANG Li-wen,LIN Tun,CHEN Yang,WANG Ya
(School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China)
Abstract: According to the analysis on water quality monitoring indexes data of Yao lake in Jiangxi from May 2010 to April 2011, the nine monitoring sites were classified into two kinds of areas using Q-type analysis method, based on which the temporal and spatial distribution rules of chlorophyll-a were investigated. The results showed that the annual average content of chlorophyll-a was 25.82 mg/m3; and the variation range in the monitoring sites were 1.59~142.68 mg/m3. From the view of temporal distribution,on the whole, chlorophyll-a content increased continuously in spring,summer and autumn, and reduced in winter. Chlorophyll-a content was significantly different in different sites; and it decreased continuously with the decrease of nutrient content. The correlation between chlorophyll-a content and environmental factors was analyzed using Pearson index method. There was high positive correlations between chlorophyll-a content and water temperature (or dissolved oxygen), nutrient (total phosphorus, nitrite nitrogen, ammonia nitrogen), pH; while high negative correlation between chlorophyll-a content and transparency.
Key words: chlorophyll-a; temporal and spatial distribution; environmental factors; correlation; Yao lake
收稿日期:2012-10-29
基金項目:國家水體污染控制與治理重大專項(2009ZX07106-001)
作者簡介: 江立文(1968-),男,江西都昌人,教授,主要從事水環境污染控制研究,(電話)13803503926(電子信箱)jianglw@ecjtu.jx.cn。
瑤湖位于長江中下游江西省南昌市的東部,是集水產養殖和水上娛樂為一體的封閉型城市淺水湖泊。湖面呈長方形,自南向北分為上瑤湖、中瑤湖、下瑤湖,水面面積15.86 km2,平均水深近2 m[1]。浮游植物在湖泊生態系統的物質循環和能量轉化過程中起著重要的作用,而水體葉綠素a是評價浮游植物含量高低的重要指標[2]。國內外學者利用湖泊(水庫)水體環境因子的監測數據對湖泊水體葉綠素a與環境因子之間的關系進行了大量的研究[3-9]。……