Carbon cycling in terrestrial environments: Chapter 17

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Abstract

This chapter reviews a number of applications of isotopic techniques for the investigation of carbon cycling processes. Carbon dioxide (C02) is an important greenhouse gas. Its concentration in the atmosphere has increased from an estimated 270 ppm at the beginning of the industrial revolution to ∼ 360 ppm at present. Climatic conditions and atmospheric C02 concentration also influence isotopic discrimination during photosynthesis. Natural and anthropogenically induced variations in the carbon isotopic abundance can be exploited to investigate carbon transformations between pools on various time scales. It also discusses one of the isotopes of carbon, the 14C, that is produced in the atmosphere by interactions of cosmic-ray produced neutrons with stable isotopes of nitrogen (N), oxygen (O), and carbon (C), and has a natural abundance in the atmosphere of ∼1 atom 14 C per 1012 atoms 12C. The most important factor affecting the measured 14C ages of soil organic matter is the rate of organic carbon cycling in soils. Differences in the dynamics of soil carbon among different soils or soil horizons will result in different soil organic 14C signatures. As a result, the deviation of the measured 14C age from the true age could differ significantly among different soils or soil horizons.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Carbon cycling in terrestrial environments: Chapter 17
DOI 10.1016/B978-0-444-81546-0.50024-0
Year Published 1998
Language English
Publisher Elsevier
Contributing office(s) Fort Collins Science Center
Description 34 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Isotope tracers in catchment hydrology
First page 577
Last page 610
Online Only (Y/N) N
Additional Online Files (Y/N) N