کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2025207 | 1069988 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve](/preview/png/2025207.png)
Radiocarbon analysis of soil CO2 can provide information on the age, source and turnover rate of soil organic C. We developed a new method for passively trapping respired CO2 on molecular sieve, allowing it to be returned to the laboratory and recovered for C isotope analysis. We tested the method on a soil at a grassland site, and using a synthetic soil created to provide a contrasting isotopic signature. As with other passive sampling techniques, a small amount of fractionation of the 13C isotope occurs during sampling, which we have quantified, otherwise the results show that the molecular sieve traps a sufficiently large and representative sample of CO2 for C isotope analysis. Since 14C results are routinely corrected for mass-dependent fractionation, our results show that passive sampling of soil respiration using molecular sieve offers a reliable method to collect soil-respired CO2 for 14C analysis.
Journal: Soil Biology and Biochemistry - Volume 41, Issue 7, July 2009, Pages 1450–1456