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二氧化碳浓度升高对太湖沉水植物马来眼子菜生长的影响

邓建才1;翟水晶1,2;陈桥1,2   

  1. 1中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京210008;2中国科学院研究生院, 北京 100049
  • 收稿日期:2008-11-17 修回日期:1900-01-01 出版日期:2009-06-20 发布日期:2009-06-20

Effects of elevated CO2 concentration on the growth of submerged macrophyte Potamogeton malaianus in Taihu Lake.

DENG Jian-cai1;ZHAI Shui-jing1,2;CHEN Qiao1,2   

  1. 1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-11-17 Revised:1900-01-01 Online:2009-06-20 Published:2009-06-20

摘要: 通过室外培养试验,研究不同CO2浓度条件下沉水植物马来眼子菜的生长及生理变化.结果表明:CO2浓度升高(1000 μmol·mol-1)条件下,马来眼子菜单株的平均生物量增加了44.3%(P<0.01),茎生物量比重下降了5.5%(P<0.05);根和叶中氮含量分别下降了18.1%和6.4%(P<0.05),而茎中氮含量变化不明显(P>0.05);根、茎、叶中磷含量分别增加了22.2%(P<0.05)、26.6%(P>0.05)和38.8%(P<0.05);可溶性糖含量增加了27.3%、18.3%和37.5%(P<0.05);根、茎和叶中全碳含量增加了4.6%、5.3%和2.0%;CO2浓度升高使水体中氮、磷含量分别下降了7.9%和5.1%(P<0.05),但对底泥中氮、磷的含量影响不明显.CO2浓度升高将对沉水植物生长及其生境有一定影响.

关键词: 林火烈度, 归一化火烧指数(NBR), 环境因子, 过火面积, 遥感, 大兴安岭呼中林区

Abstract: An outdoor culture experiment was conducted to study the growth and nutrient con tents of submerged macrophyte Potamogeton malaianus in Taihu Lake unde r different CO2 concentrations. As affected by elevated CO2 concentration (1 000 μmol·mol-1), the biomass per plant increased by 443% (P<001) , but the shoot biomass decreased by 55% (P<0.05). The N content in root a nd leaf decreased by 181% (P<005) and 64% (P<005), respectively, but that in stem was less affected (P>005). The P content in root, shoot, and leaf increased by 222% (P<005), 266% (P>005) and 388% ( P<005), soluble sugar content increased by 273%, 183% and 375% (P< 005), and total C content increased by 46%, 53% and 20%, respectively. E levated CO2 concentration decreased the N and P concentrations in w ater body by 79% and 51% (P<005), respectively, but had less effects o n the N and P contents in sediment. It was suggested that elevated CO2 concent ration had definite effects on the growth and habitat of submerged macrophytes.

Key words: forest fire severity, normalized burn ratio (NBR), environmental factor, burnt area, remote sensing, Huzhong forest region of Great Xing’an Mountains.