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• W4254482039 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Present-day lake water phosphorus (<span class=inline-formula>P</span>) enrichment and accelerated <span class=inline-formula>P</span> cycling are changes superimposed on a dynamic Holocene history of landscape development following glaciation, changes in climate, and long-term low-intensity human activity. Knowledge of the history of long-term <span class=inline-formula>P</span> dynamics is essential for understanding present-day landscape <span class=inline-formula>P</span> export and for managing both terrestrial and aquatic environments. This study is the first attempt to constrain the timing and magnitude of terrestrial changes in Holocene <span class=inline-formula>P</span> dynamics across the Northern Hemisphere using lake sediment records. Here we reconstruct trajectories in terrestrial Holocene <span class=inline-formula>P</span> dynamics for the Northern Hemisphere. We apply a simple process model to published lake sediment geochemical <span class=inline-formula>P</span> records from 24 sites, producing records of landscape <span class=inline-formula>P</span> yield and reconstructing lake water total phosphorus (TP) concentrations. Individual site trajectories of landscape <span class=inline-formula>P</span> yield and lake water TP vary systematically, with differences attributable to local landscape development history. Three distinct traits are apparent. Mountain sites with minimal direct human impact show falling <span class=inline-formula>P</span> supply and conform to conceptual models of natural soil development (Trait 1). Lowland sites where substantial (pre-)historic agriculture was present show progressively increasing <span class=inline-formula>P</span> supply (Trait 2). Lowland sites may also show a rapid acceleration in <span class=inline-formula>P</span> supply over the last few centuries, where high-intensity land use, including settlements and farming, is present (Trait 3). Where data availability permitted comparison, our reconstructed TP records agree well with monitored lake water TP data, and our sediment-inferred <span class=inline-formula>P</span> yields are comparable to reported catchment export coefficients. Comparison with diatom-inferred TP reveals good agreement for recent records. Our reconstructions form the first systematic assessment of average terrestrial <span class=inline-formula>P</span> export for the Northern Hemisphere over the Holocene and provide the empirical data needed for constraining long-term landscape <span class=inline-formula>P</span> cycling models and values for terrestrial <span class=inline-formula>P</span> export that could be used for ocean <span class=inline-formula>P</span> cycling models. The long-term perspective provided by our sediment-inferred TP can be used to identify pre-disturbance baselines for lake water quality, information essential to target-driven lake management. We find the first detectable anthropogenic impacts on <span class=inline-formula>P</span> cycling ca. 6000 BP, with more substantial impacts as early as 3000 BP. Consequently, to characterize pre-disturbance lake <span class=inline-formula>P</span> conditions at Trait 2 and Trait 3 sites, it is necessary to consider time periods before the arrival of early farmers. Our use of trait classifications has a predictive power for sites without sediment records, allowing prediction of TP baselines and <span class=inline-formula>P</span> trajectories based on regional landscape development history." @default.
• W4254482039 created "2022-05-12" @default.
• W4254482039 creator A5055251398 @default.
• W4254482039 date "2021-06-10" @default.
• W4254482039 modified "2023-10-02" @default.
• W4254482039 title "Reply on RC1" @default.
• W4254482039 doi "https://doi.org/10.5194/bg-2021-86-ac1" @default.
• W4254482039 hasPublicationYear "2021" @default.
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