Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1998 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 1910
• 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; Schizachyrium scoparium; Poa pratensis; Achillea millefolium(lanulosa); Anemone cylindrica; Agropyron repens; Berteroa incana; Rudbeckia serotina; Physalis heterophylla; Monarda fistulosa; Lychnis alba; Solidago rigida; Carex sp; Chenopodium album; Ambrosia artemisiifolia elatior; Verbascum thapsus; Polygonum convolvulus; Asclepias syriaca; Oenothera biennis; Potentilla recta; Setaria sp; Panicum oligosanthes; Lespedeza capitata; Setaria lutescens (glauca); Lactuca canadensis; Tragopogon dubius (major); Andropogon gerardi; Hedeoma hispida; Medicago sativa; Equisetum laevigatum; Cyperus sp; Physalis virginiana; Solidago nemoralis; Agrostis scabra; Ceanothus americanus; Rumex acetosella; Hieracium longipilum; Liatris aspera; Silene sp; Mosses and lichens; Panicum praecocious; Fungi; Panicum perlongum; Eragrostis spectabilis; Solidago sp; Digitaria ischaemum; Artemisia (caudata) campestris; Polygonum tenue; Erigeron canadensis; Arabis sp; Rosa arkansana; Rhus glabra; Panicum virgatum; Rubus sp; Ambrosia coronopifolia; Artemisia ludoviciana; Aster azureus; Equisetum sp; Euphorbia corollata; Asclepias ovalifolia; Sorghastrum nutans; Lithospermum canescens; Asclepias tuberosa; Oxybaphus hirsutus; Viola pedatifida; Apocynum androsaemifolium; Campanula rotundifolia; Polygala polygama; Petalostemum purpureum; Stipa spartea; Lathyrus venosus; Lithospermum caroliniense; Corylus americanus; Tradescantia sp; Viola sp; Quercus sp; Tradescantia occidentalis; Polygonum cilinode; Sisyrinchium campestre; Koeleria cristata; Viola sagittata; Aster ericoides; Fragaria virginiana; Helianthemum bicknellii; Helianthus laetiflorus; Solidago graminifolia; Ranunculus rhomboideus; Calamagrostis canadensis; Stachys palustris; Digitaria sp; Coreopsis palmata; Comandra richardsiana; Panicum sp; Bromus inermis; Muhlenbergia racemosa; Apocynum sp; Leersia oryzoides; Helianthus giganteus; Bouteloua hirsuta; Viola pedata; Parthenocissus sp; Veronicastrum virginicum; Quercus macrocarpa; Aster simplex; Cedar Creek; Giganteus; Recta; Saint-Paul
• Online Access: http://hdl.handle.net/10255/dryad.10437; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.7998001.3/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.