[Effects of elevated CO2 concentration on the growth of submerged macrophyte Potamogeton malaianus in Taihu Lake].
An outdoor culture experiment was conducted to study the growth and nutrient contents of submerged macrophyte Potamogeton malaianus in Taihu Lake under different CO2 concentrations. As affected by elevated CO2 concentration (1000 micromol x 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 and 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. Elevated CO2 concentration decreased the N and P concentrations in water body by 7.9% and 5.1% (P < 0.05), respectively, but had less effects on the N and P contents in sediment. It was suggested that elevated CO2 concentration had definite effects on the growth and habitat of submerged macrophytes.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. jcdeng@niglas.ac.cn
Jian-Cai
JC
Deng
Shui-Jing
SJ
Zhai
Qiao
Q
Chen
D001272:Atmosphere / Q000032:analysis; D018533:Biomass; D002244:Carbon / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry; D009584:Nitrogen / Q000032:analysis; D063245:Plant Development; D010944:Plants / Q000737:chemistry; D031821:Potamogetonaceae / Q000254:growth & development* / Q000378:metabolism
D002245:Carbon Dioxide; D002244:Carbon; D009584:Nitrogen