[Effect of drainage on microbial transformation processes of soil organic carbon in two typical wetlands of China]. / æ水对æå½ä¸¤ç§å
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Ying Yong Sheng Tai Xue Bao
; 35(1): 133-140, 2024 Jan.
Article
in Zh
| MEDLINE
| ID: mdl-38511449
ABSTRACT
Wetlands store one third of global soil organic carbon (SOC) and are strongly affected by artificial drainage. The impact of drainage-induced water-table decline on carbon cycling in different wetlands, particularly microbial transformation processes, remains unclear. To address this knowledge gap, we collected soil samples from two typical wetlands of China (a nutrient-poor bog located in Dajiuhu and a nutrient-rich fen in Hongyuan) and conducted an incubation experiment with the addition of 13C-labeled glucose to analyze the effects of short- and long-term drainage on SOC decomposition, extracellular enzyme activity, microbial carbon use efficiency (CUE), and microbial carbon accumulation efficiency (CAE). The results showed that both short- and long-term drainage significantly increased SOC decomposition rates in both wetlands (from 1.47 µg C·g-1·h-1 in submerged soils to 2.47 µg C·g-1·h-1 in drained soils), microbial biomass carbon derived from glucose (from 0.21 mg C·g-1 to 1.00 mg C·g-1) and CAE (from 0.29 to 0.73), but did not alter CUE (ranging from 0.34 to 0.86). Long-term drainage increased α-glucosidase activity in the Dajiuhu wetland and decreased ß-glucosidase and phenol oxidase activities in the Hongyuan wetland. In conclusion, drainage enhanced the 'microbial carbon pump' and its efficiency in wetlands mainly via increasing microbial intracellular metabolism (including respiration), but also acce-lerated SOC decomposition.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Soil
/
Wetlands
Country/Region as subject:
Asia
Language:
Zh
Journal:
Ying Yong Sheng Tai Xue Bao
Journal subject:
SAUDE AMBIENTAL
Year:
2024
Document type:
Article
Affiliation country: