Sammanfattning

The LF at three sites were rather depleted in C-14, indicating the presence of fossil material such as coal and lignite, probably inherited from the parent material. At the other sites, modern Delta C-14 signatures and positive correlations between specific mineralization rates and fLF-OC indicate the fLF is a potentially available energy and nutrient source for subsurface microorganisms throughout the profile. Declining specific mineralization rates with soil depth confirm greater stability of OC in subsoils across sites. The overall importance of OC stabilization by binding to minerals was demonstrated by declining specific mineralization rates with increasing contributions of HF-OC to bulk soil OC, and the low Delta C-14 values of HF-OC. The stability of HF-OC was greater in subsoils than in topsoils; nevertheless, a portion of HF-OC was active throughout the profile. While quantitatively less important than OC in the HF, consistent older ages of oLF-OC than fLF-OC suggest that occlusion of LF-OC in aggregates also contributes to OC stability in subsoils. Overall, our results indicate that association of OC in soils, irrespective of vegetation, soil type, and land use.

Publicerad i

Biogeosciences
2013, Volym: 10, nummer: 3, sidor: 1675-1691
Utgivare: COPERNICUS GESELLSCHAFT MBH

SLU författare

• Persson, Tryggve

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

Globala målen

SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald


UKÄ forskningsämne

Ekologi
Annan geovetenskap och miljövetenskap
Markvetenskap


Publikationens identifierare

DOI: https://doi.org/10.5194/bg-10-1675-2013

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/52379