TY  - JOUR
AU  - Sohrt, Jakob
AU  - Uhlig, David
AU  - Kaiser, Klaus
AU  - von Blanckenburg, Friedhelm
AU  - Siemens, Jan
AU  - Seeger, Stefan
AU  - Frick, Daniel A.
AU  - Krüger, Jaane
AU  - Lang, Friederike
AU  - Weiler, Markus
TI  - Phosphorus Fluxes in a Temperate Forested Watershed: Canopy Leaching, Runoff Sources, and In-Stream Transformation
JO  - Frontiers in forests and global change
VL  - 2
SN  - 2624-893X
CY  - Lausanne
PB  - Frontiers Media
M1  - FZJ-2020-00797
SP  - 85
PY  - 2019
AB  - Declining foliar phosphorus (P) levels call increasing attention to the cycling of this element in temperate forests. We explored the fluxes of P in a temperate mixed deciduous forest ecosystem in six distinct hydrological compartments: Bulk precipitation and throughfall, soil water draining laterally from three different soil depths (0–15, 15–150, 150–320 cm below soil surface), groundwater, creek and spring discharge, which were sampled at daily to bi-weekly resolution from March 2015 to February 2016. Atmospheric P fluxes into the ecosystem were equally partitioned between wet and dry deposition. Approximately 10% of the foliar P stock was lost annually by foliar leaching during late summer. The concentrations of dissolved P in soil water from the forest floor and upper mineral topsoil followed a pronounced seasonal cycle with higher concentrations during the vegetation period. The concentrations of P dissolved in soil water decreased with increasing soil depth. Using an end member mixing analysis (EMMA) we found that P sources feeding the spring water were both soil water from greater depths or groundwater with season specific contributions. Atmospheric P fluxes into the ecosystem determined in this study and P-release from weathering reported for the research site were large enough to compensate P losses with runoff. This suggests that declining foliar P levels of forests are unlikely the result of a dwindling total P supply, but rather caused by tree nutrition imbalances or alternative stressors.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000504726300001
DO  - DOI:10.3389/ffgc.2019.00085
UR  - https://juser.fz-juelich.de/record/873529
ER  -