Item talk:Q301922
From geokb
{
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"name": "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 \u223c 360 ppm at present. Climatic conditions and atmospheric C02\u00a0concentration 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\u00a014C, 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 \u223c1 atom\u00a014\u00a0C per 1012\u00a0atoms\u00a012C. The most important factor affecting the measured\u00a014C 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\u00a014C signatures. As a result, the deviation of the measured\u00a014C age from the true age could differ significantly among different soils or soil horizons.",
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