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<p>Decomposition in temporary wetlands occurs under two alternating conditions: terrestrial (dry) and aquatic phases. We explored the environmental drivers of litter decomposition in Patagonian temporary wetlands from forest and steppe biomes with different hydroperiods. Litter from two dominant species, <i>Carex aematorhyncha</i> and <i>Juncus procerus</i> decomposed in litterbags during approx. 470 days, through aquatic and dry conditions. Both species decomposed faster in the forest wetlands but not at the longest but at intermediate hydroperiod, and <i>C. aematorhyncha</i> decomposed faster than <i>J. procerus</i>. Hydrological condition (dry or aquatic) strongly influenced both litter decomposition and nutrient dynamics (nitrogen and phosphorus). During the aquatic phase, higher decomposition was found in wetlands with higher temperature and dissolved phosphorus concentration, whereas during the dry phase both litter decomposition and nutrient accumulation were associated with longer hydroperiods, higher temperature, and higher soil moisture. Our findings imply that hydroperiod length is a crucial pathway determining decomposition rates and nutrient accumulation in litter. Under current climate change scenarios, declining precipitation in Patagonia will lead to shorten hydroperiods, potentially increasing organic matter accumulation in temporary wetlands and altering detritivore food webs.</p>

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Hydroperiod in Temporary Wetlands as Determinant of Macrophyte Decomposition and Nutrient Dynamics

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Candela Madaschi,
  • Verónica Diaz Villanueva

摘要

Decomposition in temporary wetlands occurs under two alternating conditions: terrestrial (dry) and aquatic phases. We explored the environmental drivers of litter decomposition in Patagonian temporary wetlands from forest and steppe biomes with different hydroperiods. Litter from two dominant species, Carex aematorhyncha and Juncus procerus decomposed in litterbags during approx. 470 days, through aquatic and dry conditions. Both species decomposed faster in the forest wetlands but not at the longest but at intermediate hydroperiod, and C. aematorhyncha decomposed faster than J. procerus. Hydrological condition (dry or aquatic) strongly influenced both litter decomposition and nutrient dynamics (nitrogen and phosphorus). During the aquatic phase, higher decomposition was found in wetlands with higher temperature and dissolved phosphorus concentration, whereas during the dry phase both litter decomposition and nutrient accumulation were associated with longer hydroperiods, higher temperature, and higher soil moisture. Our findings imply that hydroperiod length is a crucial pathway determining decomposition rates and nutrient accumulation in litter. Under current climate change scenarios, declining precipitation in Patagonia will lead to shorten hydroperiods, potentially increasing organic matter accumulation in temporary wetlands and altering detritivore food webs.