C.C.
Delwiche, ed., Denitrification, Nitrification,
and Atmospheric Nitrous Oxide (New York:
Wiley, 1981).
In the first chapter in this edited volume,
C.C. Delwiche wrote that "one of the facets
of human influence on the earth and on biological
process has been an alteration of some of the
mineral cycle.' Of special interest are "those
of the volatile elements of biological importance,
such as carbon, nitrogen, and sulphur. The resulting
influence on the nitrogen cycle has been extensive
and is reflected in such measurable phenomena
as the nitrate content of the surface and ground
waters. The biological world is energy-driven.
virtually all of the energy that serves to do
biological work--such as muscular contraction
and the concentration and movement of ions--comes
from the sun, directly or indirectly. Photosynthesis
of green plants and other organisms is the primary
energy-capturing process, and most biological
reactions are the consequence of some earlier
photosynthetic activity. |