Effects of submerged macrophytes on kinetics of alkaline phosphatase in Lake Donghu - I. Unfiltered water and sediments

Citation
Yy. Zhou et al., Effects of submerged macrophytes on kinetics of alkaline phosphatase in Lake Donghu - I. Unfiltered water and sediments, WATER RES, 34(15), 2000, pp. 3737-3742
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
WATER RESEARCH
ISSN journal
0043-1354 → ACNP
Volume
34
Issue
15
Year of publication
2000
Pages
3737 - 3742
Database
ISI
SICI code
0043-1354(200010)34:15<3737:EOSMOK>2.0.ZU;2-U
Abstract
The impacts of submerged macrophytes on kinetics of alkaline phosphatase we re studied in two 680 m(2) enclosures in a shallow Chinese freshwater lake (Donghu Lake) from April to October 1996, and two experimental pools (120 m (2)) built inland in 1998. The submerged macrophytes were Vallisneria sp, P otamogeton crispus. In the presence of macrophytes, the concentration of or thophosphate was significantly lower, coupled with the decreasing function of organic P hydrolysis, in terms of lower V-max and higher K-m values of a Ikaline phosphatase in water, filtered and unfiltered (0.45 mu m); in the i nterstitial water, the V-max values of the enzyme in sediments were signifi cantly lower, exhibited by a spatial and vertical profile. The results impl ied the key role of submerged macrophytes was the retention of P nutrients. (C) 2000 Elsevier Science Ltd. All rights reserved.