caa a22 4500 467885753 CHVBK 20180406152733.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s10021-006-0162-6 doi (NATIONALLICENCE)springer-10.1007/s10021-006-0162-6 Tree Harvest in an Experimental Sand Ecosystem: Plant Effects on Nutrient Dynamics and Solute Generation [Elektronische Daten] [C. Keller, R. O'Brien, J. R. Havig, J. L. Smith, B. T. Bormann, D. Wang] The hydrochemical signatures of forested ecosystems are known to be determined by a time-variant combination of physical-hydrologic, geochemical, and biologic processes. We studied subsurface potassium (K), calcium (Ca), and nitrate (NO3) in an experimental red -pine mesocosm to determine how trees affect the behavior of these nutrients in soil water, both during growth and after a harvest disturbance. Solution chemistry was monitored for 2 years at the end of a 15-year period of tree growth, and then for 3 more years after harvest and removal of aboveground biomass. Concentrations were characterized by three distinct temporal patterns that we ascribe to changes in solute generation mechanisms. Prior to harvest, K soil-water concentrations were relatively uniform with depth, whereas Ca soil-water concentrations doubled with depth. Nitrate concentrations were below detection in soil water and discharge (drainage) water. Plant uptake and water/nutrient cycling exerted strong control during this interval. During the 1st year after harvest, K concentrations tripled in shallow soil water, relative to preharvest levels, and showed a strong seasonal peak in discharge that mimicked soil temperature. Summer soil temperatures and annual water flux also increased. Decomposition of labile litter, with complete nitrogen (N) immobilization, characterized this interval. In the third interval (years 2 and 3 after harvest), decomposition shifted from N to carbon (C) limitation, and Ca and NO3 concentrations in discharge spiked to nearly 200 and 400μM, respectively. Relatively stable ionic strength and carbonate chemistry in discharge, throughout the study period, indicate that carbonic-acid weathering was sustained by belowground decomposition long after the harvest. This stable chemical weathering regime, along with the persistence of N limitation for a long period after disturbance, may be characteristic of early-phase primary-successional systems. Springer Science+Business Media, Inc., 2006 biocycling nationallicence nutrient cycling nationallicence ecosystem disturbance nationallicence ecosystem regulation nationallicence mesocosm nationallicence calcium nationallicence potassium nationallicence Keller C. Department of Geology, Washington State University, 99164, Pullman, Washington, USA aut O'Brien R. Department of Geology, Allegheny College, 520 N. Main Street, 16335, Meadville, Pennsylvania, USA aut Havig J. R. Department of Geology, Washington State University, 99164, Pullman, Washington, USA aut Smith J. L. Department of Crop and Soil Sciences/US Department of Agriculture, Washington State University, 99164, Pullman, Washington, USA aut Bormann B. T. USDA Forest Service, Pacific Northwest Research Station, 3200 SW Jefferson Way, 97331, Corvallis, Oregon, USA aut Wang D. Rubenstein School of Environment and Natural Resources, University of Vermont, 323 Aiken Center, 05405, Burlington, Vermont, USA aut Ecosystems Springer-Verlag; www.springer-ny.com 9/4(2006-06-01), 634-646 1432-9840 9:4<634 2006 9 10021 https://doi.org/10.1007/s10021-006-0162-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-006-0162-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Keller C. Department of Geology, Washington State University, 99164, Pullman, Washington, USA aut NATIONALLICENCE 700 1- O'Brien R. Department of Geology, Allegheny College, 520 N. Main Street, 16335, Meadville, Pennsylvania, USA aut NATIONALLICENCE 700 1- Havig J. R. Department of Geology, Washington State University, 99164, Pullman, Washington, USA aut NATIONALLICENCE 700 1- Smith J. L. Department of Crop and Soil Sciences/US Department of Agriculture, Washington State University, 99164, Pullman, Washington, USA aut NATIONALLICENCE 700 1- Bormann B. T. USDA Forest Service, Pacific Northwest Research Station, 3200 SW Jefferson Way, 97331, Corvallis, Oregon, USA aut NATIONALLICENCE 700 1- Wang D. Rubenstein School of Environment and Natural Resources, University of Vermont, 323 Aiken Center, 05405, Burlington, Vermont, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/4(2006-06-01), 634-646 1432-9840 9:4<634 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer