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
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.
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