Title：
The response of Vallisneria spinulosa (Hydrocharitaceae) and plankton to pulse addition of inorganic nitrogen with different loading patterns
Authors：
Corresponding
Author：
Zhao Zhang, Yu Cao*, Erik Jeppesen, Wei Li
Pubyear：
2016
Title of
Journal：
Hydrobiologia
Paper
Code：
Volume：
767
Number：
Page：
175-184
Others：
Classification：
Source：
Abstract：
The global climate change may lead to more extreme climate events such as severe flooding creating excessive pulse-loading of nutrients, including nitrogen (N), to freshwaters. We conducted a 3-month mesocosm study to investigate the responses of phytoplankton, zooplankton and Vallisneria spinulosa to different N loading patterns using weekly and monthly additions of in total 14 g N m(-2) month(-1) during the first 2 months. The monthly additions led to higher phytoplankton chlorophyll a and total phytoplankton biomass than at ambient conditions as well as lower leaf biomass and a smaller ramet number of V. spinulosa. Moreover, the biomass of cyanobacteria was higher during summer (August) in the monthly treatments than those with weekly or no additions. However, the biomass of plankton and macrophytes did not differ among the N treatments at the end of the experiment, 1 month after the termination of N addition. We conclude that by stimulating the growth of phytoplankton (cyanobacteria) and reducing the growth of submerged macrophytes, short-term extreme N loading may have significant effects on shallow nutrient-rich lakes and that the lakes may show fast recovery if they are not close to the threshold of a regime shift from a clear to a turbid state.
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