Greenhouse gas emissions and extracellular enzyme activity variability during decomposition of native versus invasive riparian tree litter

摘要: Invasive plants alter riparian vegetation communities and shift biogeochemical processes by changing decomposition rates the soil chemical environment created leaf litter. It is unclear if this mechanism shifts nutrient dynamics favoring invasive dominance; areas in Southwestern USA invaded salt cedar Russian olive often still host mixed stands of native plants. To test hypothesis that plant success related to altered litter inputs, microbial activity cycling, we performed laboratory incubations examining greenhouse gas emissions extracellular enzyme (EEA). The responses GHG flux EAA were measured from decomposing translocated woody perennials between soils where they growing. Litter two species (salt olive) trees (coyote willow Fremont cottonwood) tracked for 3 months. Soil respiration, carbon content EEA all more closely origin than species. highest rate was soil. nitrate at end experiment collected under cottonwood. Nitrous oxide (N2O) significantly greater other species, on types. Patterns observed here suggest (1) influences local properties over lifetime a have control short-term input source, (2) strongly available C resources, (3) shrub may be responsible previously undocumented large N2O systems USA.