Journal
CATENA
Volume 145, Issue -, Pages 285-290Publisher
ELSEVIER
DOI: 10.1016/j.catena.2016.06.026
Keywords
Alpine wetland; C mineralization; Drying-rewetting cycles; Litter addition; N mineralization; Soil organic C
Funding
- Fundamental Research Funds for the Central Universities [TD-JC-2013-1]
- National Natural Science Foundation of China [41571084, 41071329]
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Wetting-drying cycles can influence decomposition of litter and soil organic carbon (SOC) and their mineralization, but such effects have seldom been explored in alpine wetland soils. We conducted a 120-day incubation experiment with alpine wetland soils to which we added litter or not. These soil samples were assigned to two constant moisture treatments (60% or 100% soil water-holding capacity, WHC) or to a wetting-drying treatment that cycled between 60% and 100% WHC. Drying-rewetting cycles significantly accelerated carbon (C) mineralization and nitrogen (N) immobilization compared to soil under saturated soil moisture conditions. Litter addition greatly increased C mineralization and N immobilization, but the intensity of mineralization was regulated by soil moisture through microbial biomass. A significantly negative relationship between C and N mineralization became more pronounced when litter was added. Thus, drying-rewetting cycles can alter C and N mineralization, and this effect can strongly depend on litter in alpine wetlands. This indicates that future climate change could affect C stocks in alpine wetland soil through altering moisture and litter production. (C) 2016 Elsevier B.V. All rights reserved.
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