Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1999 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; Agropyron repens; Schizachyrium scoparium; Poa pratensis; Cyperus sp; Lespedeza capitata; Anemone cylindrica; Physalis heterophylla; Arabis hirsuta; Achillea millefolium(lanulosa); Asclepias syriaca; Euphorbia glyptosperma; Lychnis alba; Mosses and lichens; Fungi; Chenopodium album; Polygonum convolvulus; Solidago rigida; Carex sp; Stachys palustris; Asclepias tuberosa; Andropogon gerardi; Berteroa incana; Hedeoma hispida; Setaria lutescens (glauca); Solidago sp; Oenothera biennis; Panicum capillare; Liatris aspera; Eragrostis spectabilis; Tradescantia occidentalis; Equisetum laevigatum; Agrostis scabra; Polygala polygama; Rumex acetosella; Panicum oligosanthes; Cyperus filiculmis; Antennaria neglecta; Silene antirrhina; Erigeron strigosus; Panicum praecocious; Solidago nemoralis; Aristida basiramea; Physalis virginiana; Hieracium longipilum; Artemisia (caudata) campestris; Polygonum tenue; Rosa arkansana; Rhus glabra; Rubus sp; Artemisia ludoviciana; Viola pedatifida; Apocynum androsaemifolium; Sorghastrum nutans; Euphorbia corollata; Ambrosia coronopifolia; Rudbeckia serotina; Asclepias ovalifolia; Chenopodium leptophyllum; Aster azureus; Lathyrus venosus; Campanula rotundifolia; Lithospermum canescens; Apocynum cannabinum; Lithospermum caroliniense; Petalostemum purpureum; Stipa spartea; Aster ericoides; Panicum perlongum; Poa sp; Sisyrinchium campestre; Ranunculus rhomboideus; Calamagrostis canadensis; Quercus ellipsoidalis; Lechea stricta; Solidago graminifolia; Helianthus giganteus; Quercus macrocarpa; Muhlenbergia racemosa; Helianthus laetiflorus; Setaria italica; Ambrosia artemisiifolia elatior; Leersia oryzoides; Comandra richardsiana; Polygonatum canaliculatum; Oxybaphus nyctaginea; Lactuca canadensis; Helianthemum bicknellii; Fragaria virginiana; Pedicularis canadensis; Giganteus; Italica; Saint-Paul; Cedar Creek
• Online Access: http://hdl.handle.net/10255/dryad.11986; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.7999001.3/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.