About Us | Help Videos | Contact Us | Subscriptions
 

Soil Science Society of America Journal Abstract -

Radiocarbon Signatures of Turnover Rates in Active Soil Organic Carbon Pools

 

This article in SSSAJ

  1. Vol. 57 No. 4, p. 1020-1022
     
    Received: Aug 21, 1992


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2136/sssaj1993.03615995005700040023x
  1. Yuch-Ping Hsieh 
  1. Wetland Ecology Program, Agricultural Research, Florida A&M Univ., Tallahassee, FL 32307

Abstract

Abstract

Identifying turnover rates in active soil organic carbon (SOC) pools is a critical step toward the understanding of soil nutrient cycling and global C cycles. The mean residence times (MRT) of the dominating active SOC pools in surface soils are usually less than a few decades. This range of MRT is difficult to determine because it is too short for radiocarbon dating and too long for most tracer techniques. I developed a procedure to construct radiocarbon signatures for identifying MRT in active SOC pools based on the residue bomb 14C in the atmosphere. The radiocarbon signature is specific to the year when a soil sample is taken. The sensitivity of the radiocarbon signatures is a function of MRT and the time when a soil sample is taken. This method is sensitive to MRT of active SOC pools in a range from 1 to 80 yr at the present time. Using those radiocarbon signatures, the MRT of active SOC pools in the Morrow Plots (Urbana, IL) and Sanborn Field (Columbia, MO) were estimated at 67 and 34 yr, respectively.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America