Long-term soil warming decreases soil microbial necromass carbon by adversely affecting its production and decomposition.
Glob Chang Biol
; 30(6): e17379, 2024 Jun.
Article
en En
| MEDLINE
| ID: mdl-39031669
ABSTRACT
Microbial necromass carbon (MNC) accounts for a large fraction of soil organic carbon (SOC) in terrestrial ecosystems. Yet our understanding of the fate of this large carbon pool under long-term warming is uncertain. Here, we show that 14 years of soil warming (+4°C) in a temperate forest resulted in a reduction in MNC by 11% (0-10 cm) and 33% (10-20 cm). Warming caused a decrease in the content of MNC due to a decline in microbial biomass carbon and reduced microbial carbon use efficiency. This reduction was primarily caused by warming-induced limitations in available soil phosphorus, which, in turn, constrained the production of microbial biomass. Conversely, warming increased the activity of soil extracellular enzymes, specifically N-acetylglucosaminidase and leucine aminopeptidase, which accelerated the decomposition of MNC. These findings collectively demonstrate that decoupling of MNC formation and decomposition underlie the observed MNC loss under climate warming, which could affect SOC content in temperate forest ecosystems more widespread.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Suelo
/
Microbiología del Suelo
/
Carbono
/
Bosques
Idioma:
En
Revista:
Glob Chang Biol
Año:
2024
Tipo del documento:
Article
País de afiliación:
Austria