Exam 19: Nutrient Cycling and Retention

The largest reservoir of phosphorus in most ecosystems is phosphorus

Phosphorus is an important constituent of

The rate of decomposition of leaf litter in woodlands can be strongly influenced by

Likens and Bormann found that over 90% of the nutrients in the Hubbard Brook Experimental Forest were in the soil organic matter.

The release of ammonium (NH₄⁺)from decaying organic material is called ____________.

In aquatic ecosystems,leaves with high lignin content decompose

A major perturbation of the carbon cycle by human activity is associated with

The "denitrification" reaction converts nitrate (NO₃^-)to nitrogen gas (N₂)under aerobic conditions.

The major pool of nitrogen in the atmosphere is the direct source of nitrogen for most organisms.

Nitrogen enrichment of ecosystems by human activity is largely driven by

The process of denitrification is

"Nitrogen fixation" refers to the conversion of Rev: 12_06_2013_QC_42091

Streams with higher densities of stream invertebrates would be expected to have shorter spiraling lengths.

Clearcutting at Hubbard Brook Experimental Forest sharply

Nitrogen fixation is an energy-demanding process because of the strong _____ bond between the two nitrogen atoms in the N₂ molecule.

Nitrate is converted to molecular nitrogen,N₂,in a process called

________________ is the process of increased nutrient inputs into an ecosystem resulting in increased primary productivity and reduced biodiversity.

A normal distribution is assumed for which of the following statistical tests?

Nitrogen export was greatest in streams draining watersheds from

High soil nutrient content usually leads to slower decomposition,because soil organisms have less need for nutrients of organic origin.