NDLI: The Presence of Nitrates and the Impact of Ultraviolet Radiation as Factors that Determine Nitrate Reductase Activity and Nitrogen Concentrations in Deschampsia antarctica Desv. Around Penguin Rookeries on King George Island, Maritime Antarctica

Content Provider	Springer Nature Link
Author	Krywult, Marek Smykla, Jerzy Wincenciak, Adam
Copyright Year	2013
Abstract	Plant communities around penguin rookeries were studied during the Antarctic summer. Antarctic hair grass Deschampsia antarctica was examined. The abundance of this grass around penguin rookeries demonstrated a characteristic distribution. Eight UV screens were installed on a transect leading away from the rookeries. Nitrate reductase activity was measured below and outside of the screens. The activity varied between the measurement sites and also changed with the distance from rookeries. Fifteen cycles of nitrate reductase activity were conducted during the experiment. The highest values of nitrate reductase in the leaves of plants protected from UV radiation, which occurred in well-fertilized sites close to the rookery, reached 743.1 (SD = 789.7) nmol of nitrite synthesized g$^{−1}$ of dry mass h$^{−1}$; the lowest occurred in the poorly fertilized sites 77.2 (SD = 41.2) nmol g$^{−1}$ of dry mass h$^{−1}$. Nitrate reductase activity in unprotected plants growing in ambient conditions reached up to 843.8 (SD = 894.5) in well-fertilized sites and 159.5 (SD = 257.6) nmol g$^{−1}$ of dry mass h$^{−1}$, respectively. The greatest abundance of D. antarctica occurred in the middle of the transect. The influence of ultraviolet radiation caused the induction of NR activity in poorly fertilized sites, but this effect was not visible in sites that were well fertilized. Total nitrogen concentrations in the plant tissues varied between 1.4 % in poor sites and 3.4 % in sites that were situated close to the rookeries. In addition, the concentrations of total nitrogen in the soil varied between the sites and ranged from 0.2 to 3.3 %.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	224
Issue Number	5
e-ISSN	15732932
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-04-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrate reductase activity Ultraviolet radiation Deschampsia antarctica King George Island Maritime Antarctic Environment Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Soil Science & Conservation Hydrogeology Climate Change
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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