photosynthetically

Another category of radiation with longer wavelengths is absorbed and used by plants in photosynthesis, and is known as photosynthetically active radiation.

Antarctic ozone hole 2009

Another category of radiation with longer wavelengths is absorbed and used by plants in photosynthesis, and is known as photosynthetically active radiation.

Featured Articles - Encyclopedia of Earth 2010

Lichens, which are capable of surviving the harshest of environmental conditions, are frequently the most important photosynthetically active organisms in tundra ecosystems.

Human impacts on the biodiversity of the Arctic 2009

This period was also accompanied by significant increases in DOC in lakes, lower water transparency, and less exposure to photosynthetically active radiation (PAR) and UV radiation in the water column.

Historical changes in freshwater ecosystems in the Arctic 2009

The timing of the start of the snow-free period is of critical importance, and more important than the timing of autumn snowfall, because solar angles are already high when plants start growth and each extra snow-free day at the beginning of the growing season will enable plants to access high levels of photosynthetically active radiation (Fig. 7.8; see also section 7.5).

Phenotypic responses of arctic species to changes in climate and ultraviolet-B radiation 2009

A significant fraction of photosynthetically active radiation reaches Earth's surface, a condition that enables life to exist.

Antarctic ozone hole 2009

Canopy leaf area is low because low soil nutrient availability, particularly N, limits the ability of the vegetation to develop a large, photosynthetically efficient leaf area [43], and it also limits the ability of the vegetation to use newly fixed C for new growth, because growth requires adequate supplies of multiple elements in addition to C [44].

Effects of changes in climate and UV radiation levels on function of arctic ecosystems in the short and long term 2009

As in higher plants, carotenoids protect algae, fungi, and lichens from excessive photosynthetically active radiation [126] and perhaps also have a role in protecting them from ultraviolet radiation.

General characteristics of arctic species and their adaptations in the context of changes in climate and ultraviolet-B radiation levels 2009

The weather station collects temperature, barometric pressure, relative humidity, photosynthetically active radiation (PAR), and wind speed/direction.

Great Bay National Estuarine Research Reserve, New Hampshire 2008

The 10-foot tall aluminum tower serves as a backbone for the attachment of environmental sensors that record air temperature, relative humidity, barometric pressure, wind speed and direction, and photosynthetically active radiation (the solar energy that plants use in the process of photosynthesis).

Guana Tolomato Matanzas National Estuarine Research Reserve, Florida 2007