scholarly journals The effects of chlorophyta on the growth of submersed macrophyte Vallisneria natans:a laboratory experiment

2007 ◽  
Vol 19 (2) ◽  
pp. 111-117
Author(s):  
LI Huijuan ◽  
◽  
NI Leyi
Keyword(s):  
Laboratory Experiment ◽  
Vallisneria Natans ◽  
Submersed Macrophyte

scholarly journals Effect of substrate grain size on the growth and morphology of the submersed macrophyte Vallisneria natans L.

Limnologica ◽  
2012 ◽  
Vol 42 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Z.Q. Li ◽  
L.Y. Kong ◽  
L.F. Yang ◽  
M. Zhang ◽  
T. Cao ◽  
...  
Keyword(s):  
Grain Size ◽  
Vallisneria Natans ◽  
Submersed Macrophyte

The role of NH+4 toxicity in the decline of the submersed macrophyte Vallisneria natans in lakes of the Yangtze River basin, China

2007 ◽  
Vol 58 (6) ◽  
pp. 581 ◽  
Author(s):  
Te Cao ◽  
Ping Xie ◽  
Leyi Ni ◽  
Aiping Wu ◽  
Min Zhang ◽  
...  
Keyword(s):  
Water Column ◽  
River Basin ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
The Yangtze River ◽  
Submersed Macrophytes ◽  
Vallisneria Natans ◽  
Submersed Macrophyte ◽  
N Concentration ◽  
The Yangtze River Basin

Experimental and field studies were conducted to evaluate the effects of NH4+ enrichment on growth and distribution of the submersed macrophyte, Vallisneria natans L, in lakes of the Yangtze River in China, based on the balance between free amino acids (FAA) and soluble carbohydrates (SC) in the plant tissue. Increase of NH4+ rather than NO3– concentrations in the water column caused FAA accumulation and SC depletion of the plant. The plant showed a unimodal pattern of biomass distribution along both FAA/SC ratios and external NH4+ concentrations, indicating that a moderate NH4-N concentration (<0.3 mg L–1) benefited the plant, whereas the high NH4-N concentration (>0.56 mg L–1) eliminated the plant completely. Therefore, 0.56 mg NH4-N mg L–1 in the water column was taken as the upper limit for V. natans in lakes of the Yangtze River basin. The mesocosm experiment showed that at a high external NH4-N (0.81 mg L–1), V. natans failed to propagate with a loss of half SC content (5 mg g–1 DW) in the rhizomes, indicating that the consumption of carbohydrates for detoxification of excess NH4+ into non-toxic FAA significantly diminished carbohydrate supply to the rhizomes. This might consequently inhibit the vegetative reproduction of the plant, and also might be an important cause for the decline and disappearance of the plant with eutrophication. The present study for the first time reports substantial ecophysiological evidences for NH4+ stress to submersed macrophytes, and indicates that NH4+ toxicity arising from eutrophication probably plays a key role in the deterioration of submersed macrophytes like V. natans.

Ammonium loading disturbed the microbial food webs in biofilms attached to submersed macrophyte Vallisneria natans

2019 ◽  
Vol 659 ◽  
pp. 691-698 ◽  
Author(s):  
Lingling Yan ◽  
Xiaoying Mu ◽  
Bing Han ◽  
Songhe Zhang ◽  
Changhao Qiu ◽  
...  
Keyword(s):  
Food Webs ◽  
Microbial Food Webs ◽  
Vallisneria Natans ◽  
Submersed Macrophyte

scholarly journals Remedial function of submersed macrophyte Vallisneria natans to PAHs-contaminated sediments

2018 ◽  
Vol 30 (4) ◽  
pp. 1012-1018 ◽  
Author(s):  
ZHANG Yu ◽  
◽  
YAN Zaisheng ◽  
WU Huifang ◽  
JIANG Helong ◽  
...  
Keyword(s):  
Contaminated Sediments ◽  
Vallisneria Natans ◽  
Submersed Macrophyte

Susceptibility of Angoff Method to Judgmental Errors: A Laboratory Experiment

2006 ◽  
Author(s):  
Daren S. Protolipac ◽  
Lisa Finkelstein ◽  
John Kulas
Keyword(s):  
Laboratory Experiment ◽  
Angoff Method

Investigation of discontinuous periodic signals using the measuring labview complex

2020 ◽  
pp. 72-79
Author(s):  
E.B. Solovyeva ◽  
◽  
Yu.M. Inshakov ◽  
Keyword(s):  
Fourier Series ◽  
Laboratory Experiment ◽  
Gibbs Phenomenon ◽  
Electrical Signals ◽  
Measuring Complex ◽  
Universal Measuring ◽  
Depth Study ◽  
Periodic Signals ◽  
Truncated Fourier Series

General approaches to the analysis of the Gibbs phenomenon for discontinuous periodic signals approximated by the truncated Fourier series are considered. Methods for smoothing the truncated Fourier series and improving its convergence are discussed. The software means for modeling is a universal measuring complex LabVIEW, which possesses a convenient environment for analyzing electrical signals, on the basis of this complex a laboratory experiment is carried out. The advantages of the measuring LabVIEW complex and its capabilities for in-depth study of discontinuous periodic signals are noted.

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