Separating root and soil microbial contributions to soil respiration: A review of methods and observations View Full Text


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Article Info

DATE

2000-01

AUTHORS

P.J. Hanson, N.T. Edwards, C.T. Garten, J.A. Andrews

ABSTRACT

Forest soil respiration is the sum of heterotrophic (microbes, soil fauna) and autotrophic (root) respiration. The contribution of each group needs to be understood to evaluate implications of environmental change on soil carbon cycling and sequestration. Three primary methods have been used to distinguish hetero- versus autotrophic soil respiration including: integration of components contributing to in situ forest soil CO2 efflux (i.e., litter, roots, soil), comparison of soils with and without root exclusion, and application of stable or radioactive isotope methods. Each approach has advantages and disadvantages, but isotope based methods provide quantitative answers with the least amount of disturbance to the soil and roots. Published data from all methods indicate that root/rhizosphere respiration can account for as little as 10 percent to greater than 90 percent of total in situ soil respiration depending on vegetation type and season of the year. Studies which have integrated percent root contribution to total soil respiration throughout an entire year or growing season show mean values of 45.8 and 60.4 percent for forest and nonforest vegetation, respectively. Such average annual values must be extrapolated with caution, however, because the root contribution to total soil respiration is commonly higher during the growing season and lower during the dormant periods of the year. More... »

PAGES

115-146

References to SciGraph publications

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  • 1986-05. δ13C values of CO2 from soil respiration on sites with crops of C3 and C4 type of photosynthesis in OECOLOGIA
  • 1973. The Role of Soil Invertebrates in Turnover of Organic Matter and Nutrients in ANALYSIS OF TEMPERATE FOREST ECOSYSTEMS
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    http://dx.doi.org/10.1023/a:1006244819642

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