Nutrient concentrations in a Littorella uniflora community at higher CO2 concentrations and reduced light intensities

被引:13
作者
Andersen, T
Pedersen, O
Andersen, FO
机构
[1] Univ So Denmark, Inst Biol, DK-5230 Odense, Denmark
[2] Univ Copenhagen, Freshwater Biol Lab, DK-3400 Hillerod, Denmark
关键词
increasing atmospheric CO2; isoetids; Littorella uniflora; sediment-water nutrient fluxes; softwater lakes;
D O I
10.1111/j.1365-2427.2005.01390.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
1. Oligotrophic softwater lakes represent a special type of aquatic ecosystem with unique plant communities where generalisations from other aquatic plant communities to rising CO2 in the water column may not apply. 2. In the present study, we set up large in situ mesocosms and supporting laboratory experiments with isoetid vegetation (Littorella uniflora) where water column CO2 and light could be manipulated in order to test whether (i) light and CO2 availability affect nutrient concentrations in isoetid vegetation, and (ii) if changes in light and CO2 climate affect fluxes of inorganic nitrogen (N) and phosphorus (P) from sediment to water column, which potentially could result in increased growth of epiphytic algae. 3. The results showed that the standing stocks of phosphorus and nitrogen in the L. uniflora vegetation were significantly influenced by CO2 concentration and light intensity. Both standing stocks of P and N were significantly higher in the mesocosm treatments with high CO2 concentration than in those at low CO2 concentration. Similarly, standing stocks of P and N enhanced with increasing light intensity. 4. Measurements of nutrient fluxes both in the field and the laboratory did not show any significant release of nutrients to the water column from plants or sediments at any of the light or CO2 treatments. However, mats of epiphytic algae developed from the beginning of June to late September and caused a light reduction for the isoetid vegetation. 5. Increasing CO2 concentrations in the water column may over time potentially result in a change in soft water plant communities.
引用
收藏
页码:1178 / 1189
页数:12
相关论文
共 56 条
[1]   NUTRIENT CYCLING IN SHALLOW, OLIGOTROPHIC LAKE KVIE, DENMARK .2. EFFECTS OF ISOETIDS ON THE EXCHANGE OF PHOSPHORUS BETWEEN SEDIMENT AND WATER [J].
ANDERSEN, FO ;
OLSEN, KR .
HYDROBIOLOGIA, 1994, 275 :267-276
[2]   Interactions between light and CO2 enhance the growth of Riccia fluitans [J].
Andersen, T ;
Pedersen, O .
HYDROBIOLOGIA, 2002, 477 (1-3) :163-170
[3]  
[Anonymous], 2004, Trends: A compendium of data on global climate change
[4]  
[Anonymous], ACTA BOT NEERL
[5]  
Bjorkman O, 1981, ENCY PLANT PHYSL A, V12A, P57
[6]   UTILIZATION OF SEDIMENT CO2 BY SELECTED NORTH-AMERICAN ISOETIDS [J].
BOSTON, HL ;
ADAMS, MS ;
PIENKOWSKI, TP .
ANNALS OF BOTANY, 1987, 60 (05) :485-494
[7]   A DISCUSSION OF THE ADAPTATIONS FOR CARBON ACQUISITION IN RELATION TO THE GROWTH STRATEGY OF AQUATIC ISOETIDS [J].
BOSTON, HL .
AQUATIC BOTANY, 1986, 26 (3-4) :259-270
[8]  
BOWER CE, 1980, CANADIAN J FISHERIES, V37, P798
[9]  
BOWES G, 1993, ANNU REV PLANT PHYS, V44, P309, DOI 10.1146/annurev.pp.44.060193.001521
[10]  
BOWES G, 1985, PLANT LIFE AQUATIC A, P79