کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4570903 | 1629207 | 2016 | 6 صفحه PDF | دانلود رایگان |
• Drying-rewetting cycles significantly regulated C mineralization and N immobilization.
• C mineralization and N immobilization were greatly increased with litter addition.
• A significant positive relationship between C and N mineralization became more pronounced when litter was added.
• Drying-rewetting cycles can alter C and N mineralization, and such effect strongly depend on litter in alpine wetlands.
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.
Journal: CATENA - Volume 145, October 2016, Pages 285–290