磷对太湖沉水植物伊乐藻的影响  

Effect of phosphorus on the growth of submerged macrophyte Elodea in the Taihu Lake

作　　者：黄瑾[1,2] 宋玉芝[2] 秦伯强[1] 

机构地区：[1]中国科学院湖泊与环境国家重点试验室,南京210008 [2]南京信息工程大学环境科学与工程学院,南京210044

出　　处：《南京信息工程大学学报（自然科学版）》2009年第3期233-237,共5页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：国家自然科学基金重点资助项目(40730529);江苏省高校自然科学基础研究项目(07KJD610136)

摘　　要：在过滤原位太湖湖水的基础上,采用KH2PO4为磷源,设定了0.064、0.128、0.512、1.024mg.L-14个不同总磷(TP)浓度的培养液,以洗净的太湖沙为栽培基质,对沉水植物伊乐藻(Elodea Nuttalii)进行了为期50d的栽培试验.通过测定伊乐藻的生物量、生长速率、叶绿素含量、光合作用速率等指标,研究了磷对沉水植物伊乐藻的影响.结果表明:磷对沉水植物伊乐藻的生物量、生长速率、叶绿素含量以及光合作用速率均有影响.在中低磷浓度下(磷浓度小于或等于0.128mg.L-1)伊乐藻的生物现存量和生长速率有所增加;而高磷浓度的条件下(磷浓度大于0.128mg.L-1)伊乐藻生物现存量和生长速率有所下降.并探讨了太湖沉水植物伊乐藻生存的关键性生态因子.In order to study the response of submerged macrophyte Elodea nuttalii to phosphorus,indoor cultivation experiment was conducted for 50 days using filtered lake water of Lake Taihu at different concentrations of phosphorus,respectively set at 0. 064,0. 128,0. 512 ,and 1. 024 mg·L^-1 ,with KH2PO4 used as the source of phosphorus. Results show that dry weight, growth rate, chlorophyll content, photosynthesis rate of Elodea nuttalii change differently with the increase of phosphorus. The biomass and growth rates of Elodea increase as phosphorus supply increases to 0. 128 mg·L^-1 ,but decrease as phosphorus supply increases above 0. 128 mg·L^-1. Based on the results of the tests, the key ecological factors affecting the existence of Elodea nuttalii are discussed in combination with the existing literature and the current concentrations of nitrogen and phosphorus in Lake Taihu. The paper includes 4 figures, 1 table and 16 references.

关 键 词：磷 伊乐藻 生物量 生理指标 

分 类 号：X173[环境科学与工程—环境科学]