Mr. Andersen from Bozeman Science explains the cycles for water, carbon, nitrogen, and phosphorus. A 10:06 minute YouTube video.

Another episode from Crash Course Ecology with the emphasis on cycling of energy and nutrients. A 10:09 minute YouTube video.

Stanford University scientists have complete genetic analysis of over 10,000 species of fungi, the primary decomposers of most ecosystems. A 2014 article from eScienceNews.com

Researchers have identified the percentages of denitrification and anammox that remove nitrogen from oceans and release it into the atmosphere. A 2014 article from eScienceNews.com

Tropical trees are releasing carbon dioxide in greater quantities than expected in response to increases in temperature, according to an international research team. A 2014 article from Scientific American.