Variation in summer nitrogen and phosphorus uptake among Siberian headwater streams

Polar research

William V. Sobczak¹  Karen E. Frey²  John D. Schade³  Travis Drake⁴  Erin C. Seybold⁵  Nikita Zimov⁶  Seth Spawn⁷  Robert M. Holmes⁷ 

[1] Biology Department College of the Holy Cross, 1 College Street, Worcester, MA 01610, USA;Department of Geography Clark University, 950 Main Street, Worcester, MA 01610, USA;Environmental Studies Department St. Olaf College, 1520 St. Olaf Avenue, Northfield, MN 55057, USA;Environmental Studies Program University of Colorado, 1201 17th Street, Boulder, CO 80309, USA;Nicholas School of the Environment Duke University, PO Box 90328, Durham, NC 27708, USA;Northeast Science Station, P.O. Box 18, Cherskiy, Sakha Republic, RussiaCorrespondence;Wood Hole Research Center, 149 Woods Hole Road, Falmouth, MA 02540, USA

关键词: Arctic streams;    nutrient uptake;    hydrologic transient storage;    phosphorus sorption;    coupled N and P cycling;   

DOI  :  10.3402/polar.v35.24571

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Arctic streams are likely to receive increased inputs of dissolved nutrients and organic matter from thawing permafrost as climate warms. Documenting how Arctic streams process inorganic nutrients is necessary to understand mechanisms that regulate watershed fluxes of permafrost-derived materials to downstream ecosystems. We report on summer nitrogen (N) and phosphorus (P) uptake in streams draining upland soils from the Pleistocene, and lowland floodplain soils from the Holocene, in Siberia's Kolyma River watershed. Uptake of N and P differed between upland and floodplain streams, suggesting topographic variation in nutrient limitation. In floodplain streams, P uptake rate and uptake velocity were higher than N, while upland streams had similar values for all N and P uptake metrics. Phosphorus uptake velocity and size of the transient hydrologic storage zone were negatively related across all study streams, indicating strong influence of hydrologic processes on nutrient fluxes. Physical sorption of P was...

【 授权许可】

CC BY-NC