Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 2002 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 2004
• Subjects: Cedar Creek Natural History Area; Long Term; Ecology; Successional dynamics; Primary Productivity; Disturbance Patterns; Nutrient Budgets; Nutrient Cycles; Climatic Variation; Biodiversity; Ecosystem functioning; Nitrogen limitation; Fire Frequency; Plant Competition; Mosses and lichens; Agropyron repens; Schizachyrium scoparium; Poa pratensis; Achillea millefolium(lanulosa); Berteroa incana; Polygonum convolvulus; Physalis heterophylla; Tragopogon dubius (major); Asclepias ovalifolia; Setaria lutescens (glauca); Asclepias syriaca; Lychnis alba; Ambrosia artemisiifolia elatior; Carex sp; Monarda fistulosa; Chenopodium album; Andropogon gerardi; Lactuca canadensis; Asclepias tuberosa; Rosa arkansana; Equisetum laevigatum; Panicum oligosanthes; Crepis tectorum; Erigeron canadensis; Rumex acetosella; Solidago nemoralis; Cyperus sp; Antennaria neglecta; Solidago rigida; Panicum praecocious; Lespedeza capitata; Liatris aspera; Physalis virginiana; Eragrostis spectabilis; Hieracium longipilum; Fungi; Arabis sp; Ulmus americana; Rhus glabra; Lactuca sp; Silene antirrhina; Ambrosia coronopifolia; Tradescantia occidentalis; Rubus sp; Artemisia ludoviciana; Apocynum androsaemifolium; Chenopodium leptophyllum; Sorghastrum nutans; Euphorbia corollata; Lithospermum caroliniense; Aster azureus; Viola pedatifida; Campanula rotundifolia; Lithospermum canescens; Lathyrus venosus; Koeleria cristata; Polygonum tenue; Corylus americanus; Quercus ellipsoidalis; Helianthemum bicknellii; Solidago graminifolia; Oxybaphus hirsutus; Stipa spartea; Anemone cylindrica; Polygonatum canaliculatum; Panicum perlongum; Calamagrostis canadensis; Aster ericoides; Helianthus laetiflorus; Sisyrinchium campestre; Ranunculus rhomboideus; Stachys palustris; Cyperus schweinitzii; Setaria italica; Quercus macrocarpa; Coreopsis palmata; Mollugo verticillata; Comandra richardsiana; Taraxicum officinalis; Muhlenbergia racemosa; Rhus sp; Quercus sp; Parthenocissus sp; Helianthus giganteus; Veronicastrum virginicum; Aster simplex; Giganteus; Italica; Saint-Paul; Cedar Creek
• Online Access: http://hdl.handle.net/10255/dryad.15523; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.7902001.3/xml

The purpose of this experiment is to measure how adding nitrogen over a long time will affect the number of species, the type of species present, the amount of annual growth, and the change from year to year in the growth of each species in a plant community which is also relieved of grazing by large and small mammals. The experiment is being conducted within fields (A, B, C, and D) which were initially low in soil nutrients. There are 8 different levels of nitrogen addition with other nutrients added to ensure that nitrogen remains the limiting nutrient, and a control which receives no nutrients. There are 6 replicates of the 9 treatments in fields A, B, and C and 5 replicates in field D. The treatments were randomly assigned to the plots. In fields A, B, and C the plots are in 6 by 9 grid and are 4 by 4 meters in size with 1 meter aisles between plots. In field D the plots are 1.5 by 4 meters and are placed in a 3 by 17 grid. The plots are enclosed by a fence to keep out mammalian herbivores. Gophers are trapped and removed as they appear. Nitrogen fertilizer (NH4NO3) is applied twice per year, once in early May and once in late June. This experiment was begun in 1982 by David Tilman.