Nitrogen and phosphorus limitations of microbial respiration in a tropical phosphorus-fixing acrisol (ultisol) compared with organic compost

Sammanfattning

We studied the nutrient I imitations of microbial respiration over time after the addition of glucose (G), glucose + nitrogen (G + N) or glucose + phosphorus (G + P) to a phosphorus-fixing tropical acrisol down to a depth of 80 cm, compared with those from compost. In the acrisol, the initial rate of respiration increase was higher when P was added together with glucose than when P was excluded. Without N, respiration reached a plateau faster and at a lower level than when N was added in excess. With glucose alone, the respiration kinetics followed the lower of the curves with G + N or G + P at any given time. Thus, nitrogen limited the maximum level of microbial respiration in the acrisol if ample carbon was available, but the initial respiration rate was limited by phosphorus. In contrast, for compost respiration was always lowest when N was not added. In conclusion, microbial respiration depended on the P-fixing properties of the soil, the time scale and the carbon availability. © 2005 Elsevier Ltd. All rights reserved

Publicerad i

Soil Biology and Biochemistry
2005, volym: 37, nummer: 7, sidor: 1407-1410
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD

SLU författare

• Ilstedt, Ulrik

  • Institutionen för skogsekologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Miljö- och naturvårdsvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1016/j.soilbio.2005.01.002

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/5653