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- W2891863488 abstract "Abstract The realization that anthropogenic nitrogen (N) deposition is causing significant environmental change in many ecosystems has led to lower emissions of reactive N and deposition rates in many regions. However, the impacts of N deposition on terrestrial ecosystems can be long lasting, with significant inertia in the return of the biota and biogeochemical processes to baseline levels. To better understand patterns of recovery and the factors that may contribute to slow or no responses following declines in N deposition, we followed plant species composition, microbial abundance, N cycling rates, soil pH , and pools of NO 3 − and extractable cations in an impacted alpine ecosystem following cessation of 12‐yr experiment increasing N deposition rates by 0, 20, 40, and 60 kg N·ha −1 ·yr −1 . Simulated N deposition had resulted in a tripling in the cover of the nitrophilic species Carex rupestris , while the dominant sedge Kobresia myosuroides had decreased by more than half at the highest N input level. In addition, nitrification rates were elevated, soil extractable magnesium (Mg 2+ ) and pH decreased, and aluminum (Al 3+ ) and manganese (Mn 2+ ) were elevated at the highest N treatment inputs. Over the nine years following cessation of N additions to the impacted plots, only the cover of the nitrophilic C. rupestris showed any recovery to prior levels. Abundances of both bacteria and fungi were lower with N addition in both treatment and recovery plots. Rates of nitrification and pools of NO 3 − remained elevated in the recovery plots, likely contributing to the lack of biotic response to the cessation of N inputs. In addition, nutrient base cations (Ca 2+ and Mg 2+ ) and soil pH remained depressed, and the toxic metal cations (Al 3+ and Mn 2+ ) remained elevated in recovery plots, also potentially influencing biotic recovery. These results emphasize the importance of considering long‐term environmental impacts of N deposition associated with legacy effects, such as elevated N cycling and losses of base cations, in determining environmental standards such as the metrics used for critical loads." @default.
- W2891863488 created "2018-09-27" @default.
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- W2891863488 date "2018-09-04" @default.
- W2891863488 modified "2023-09-27" @default.
- W2891863488 title "Limited ecosystem recovery from simulated chronic nitrogen deposition" @default.
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- W2891863488 doi "https://doi.org/10.1002/eap.1783" @default.
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