| .太湖浮游植物与营养盐相互关系[J].农业环境科学学报,2013,32(2):. |
| 太湖浮游植物与营养盐相互关系 |
| The Relationship Between Phytoplankton and Nutrients of Lake Taihu, China |
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| DOI：10.11654/jaes.2013.02.017 |
| 中文关键词: 太湖 浮游植物 微囊藻 氮 磷 |
| 英文关键词: Lake Taihu phytoplankton microcystis nitrogen phosphorus |
| 基金项目: |
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| 摘要点击次数: 2916 |
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| 中文摘要: |
| 为研究太湖浮游植物与营养盐的相互关系，于2010年3月至2011年2月对太湖竺山湾和贡湖湾这两个具有不同植物群落特征的湖区进行了监测分析。结果表明，贡湖湾浮游植物含量四季递减，竺山湾则在夏季达到最大值，具有在夏季暴发严重水华的特征。这两个湖区的营养盐具有不同的季节变化特征：竺山湾总磷（TP）以及颗粒磷（PP）在夏季达到最大值，贡湖湾则在冬季达到最大值，竺山湾的磷含量高于贡湖湾，两个湖区PP在TP中均占有很大比例且溶解性有机磷（DOP）均在冬季达到最大值，夏季达到最小值；竺山湾氨氮（NH+4-N）含量远高于贡湖湾，硝氮（NO-3-N）的四季变化幅度和贡湖湾相差不大，而NH+4-N却有明显差异，并且在竺山湾，相对于NO-3-N，NH+4-N能被浮游植物利用至更低浓度。两个湖区磷和浮游植物变化的对比表明，在藻型区浮游植物的生长与底泥磷的释放存在相互促进的机制，并且浮游植物生长消亡过程中存在磷的内循环机制，这两种机制使得水华得以维持甚至加重，而NH+4-N、NO-3-N与微囊藻的变化表明，太湖微囊藻优先及主要利用的很可能是NH+4-N。综合分析认为，治理太湖水华需要同时控制氮磷输入并考虑降低太湖磷含量。 |
| 英文摘要: |
| In order to study the relationship between phytoplankton and nutrients in lake Taihu, field monitoring and analysis were conducted in Zhushan Bay and Gonghu Bay, two regions with different phytocommunities, from March 2010 to February 2011. The phytoplankton number of Gonghu bay showed seasonal decrease, while that of Zhushan Bay where summer serious bloom occurred reached the maximum in summer. Both the total phosphorus（TP） and particulate phosphorus（PP） concentration reached the maximum in summer in Zhushan Bay while winter in Gonghu Bay. In general, the concentrations of phosphorus in Zhushan Bay were higher than those in Gonghu Bay. In the two bays, a high proportion of PP in TP both occurred and dissolved organic phosphorus（DOP） reached the maximum in winter while minimum in summer. Ammonium（NH+4-N） concentration in Zhushan Bay was much higher than that in Gonghu Bay. The seasonal variation of nitrate（NO-3-N） concentration between the two Bays didn′t show large difference while it was not this case in NH+4-N. In Zhushan Bay, NH+4-N could be utilized by phytoplankton to lower concentration than NO-3-N. The variations of phosphorus concentration and phytoplankton number indicated that in algae-dominated regions, mutual promotion existed between the release of sediment phosphorus to overlying water and the increase of phytoplankton number, maintaining even aggravating the bloom. The variations of NO-3-N and NH+4-N concentration and microcystis number indicated that the microcystis of lake Taihu probably utilized NH+4-N preferentially and mainly. Based on these results, a dual management of N and P inputs are needed to control the bloom of lake Taihu and phosphorus concentration reduction also should be taken in consideration. |
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