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- Title
The effect of spring water on the growth of a submerged macrophyte Egeria densa.
- Authors
Takahashi, Kazuya; Asaeda, Takashi
- Abstract
We elucidated the effect of spring water on the growth of Egeria densa Planch., a widespread submerged macrophyte in Japan. We observed the longitudinal distributions of physical (water temperature, particle diameter of the bed sediment, sediment layer thickness, etc.), chemical [pH, dissolved oxygen (DO), dissolved inorganic carbon (DIC), phosphate (PO-P), total nitrogen (TN), and total phosphorus (TP) content of the sediment, etc.], and biological (species composition, biomass, and growth rate) factors related to E. densa in the Kurohashi River, a spring-fed stream flowing into the Lake Biwa. It was found that E. densa growth rate from summer to autumn was negatively correlated to pH and DO, which implies that the low pH spring water increases the growth rate of the species. The growth rate was also positively correlated to the free carbon dioxide (CO) concentration ( r = 0.67, p = 0.02). These results indicate that the low pH spring water increases E. densa growth rate by affecting free CO concentration in water.
- Subjects
MACROPHYTES; PLANT growth; WATER springs; SEDIMENTS; SEASONAL physiological variations; CARBON dioxide content of plants; PLANTS
- Publication
Landscape & Ecological Engineering, 2014, Vol 10, Issue 1, p99
- ISSN
1860-1871
- Publication type
Article
- DOI
10.1007/s11355-012-0191-6