Successional and physical controls on the retention of nitrogen in an undisturbed boreal forest ecosystem
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View abstract on PubMed
Summary
This summary is machine-generated.Boreal forest succession impacts nutrient cycling. River water influx confounded nitrogen (N) leaching studies, suggesting climate warming may increase these inputs to Alaskan forests.
Area Of Science
- Ecology
- Forest Science
- Biogeochemistry
Background
- Floristic succession in boreal forests significantly influences ecosystem nutrient cycling.
- Nitrogen (N) demand by plants and microbes changes during forest succession.
- Understanding nutrient dynamics is crucial for boreal forest management.
Purpose Of The Study
- To investigate how changes in nitrogen (N) demand during boreal forest succession affect nitrogen leaching.
- To test the hypothesis that decreased N demand in late-succession forests increases dissolved inorganic nitrogen (DIN) leaching relative to dissolved organic nitrogen (DON).
- To assess the role of soil water movement and potential confounding factors like riverine inputs.
Main Methods
- Collected and analyzed soil solution chemistry from mid- and late-succession boreal forests in interior Alaska.
- Examined soil solution within and below the main rooting zones.
- Utilized hydrological and chemical analyses, including isotopic analysis (δ18O), to track water movement and sources.
Main Results
- No significant difference in the proportion of dissolved inorganic nitrogen (DIN) below the rooting zone between forest types.
- Nitrate comprised 84-98% of DIN, with higher concentrations in deeper mineral soil.
- Dissolved organic nitrogen (DON) constituted 79-92% of total dissolved nitrogen.
- Evidence indicated significant influx of water and nutrients from the glacially-fed Tanana River into the soil active layer, confounding biological controls on N retention.
Conclusions
- Riverine nutrient inputs significantly influenced soil solution chemistry, challenging initial assumptions about biological control over nitrogen retention during forest succession.
- Soil water potential correlated positively with river discharge, and isotopic signatures matched river water, confirming riverine influence.
- Climatic warming may exacerbate riverine nutrient inputs into forests adjacent to glacially-fed rivers, impacting ecosystem nutrient cycling.
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