Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1994 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 1996
• 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 & LICHENS; MISCELLANEOUS LITTER; AGROPYRON REPENS; SCHIZACHYRIUM SCOPARIUM; PANICUM PERLONGUM; POA PRATENSIS; CYPERUS SP; LESPEDEZA CAPITATA; ACHILLEA MILLEFOLIUM(LANULOSA); ERIGERON STRIGOSUS; POTENTILLA RECTA; PANICUM OLIGOSANTHES; BERTEROA INCANA; ERIGERON CANADENSIS; PENSTEMON GRACILIS; PHYSALIS HETEROPHYLLA; SETARIA LUTESCENS (GLAUCA); CHENOPODIUM ALBUM; TRAGOPOGON DUBIUS (MAJOR); MONARDA FISTULOSA; VERBASCUM THAPSUS; HIERACIUM LONGIPILUM; LYCHNIS ALBA; AMBROSIA ARTEMISIIFOLIA ELATIOR; HEDEOMA HISPIDA; POLYGONUM CONVOLVULUS; RUMEX ACETOSELLA; PANICUM PRAECOCIOUS; ERAGROSTIS SPECTABILIS; ASCLEPIAS SYRIACA; ANEMONE CYLINDRICA; MISCELLANEOUS HERBS; RUDBECKIA SEROTINA; SILENE ANTIRRHINA; EQUISETUM LAEVIGATUM; GNAPHALIUM OBTUSIFOLIUM; POLYGONUM TENUE; LACTUCA SP; CAREX SP; ANTENNARIA NEGLECTA; SOLIDAGO NEMORALIS; SOLIDAGO RIGIDA; POLYGONUM SP; FUNGI; AGROSTIS SCABRA; CHRYSOPSIS VILLOSA; CREPIS TECTORUM; LACTUCA CANADENSIS; ARISTIDA BASIRAMEA; ANDROPOGON GERARDI; FORB SEEDLINGS; ARABIS SP; LEPIDIUM DENSIFLORUM; PHYSALIS VIRGINIANA; ROSA ARKANSANA; RUBUS SP; ARTEMISIA LUDOVICIANA; ASTER AZUREUS; LITHOSPERMUM CAROLINIENSE; EUPHORBIA COROLLATA; SORGHASTRUM NUTANS; VIOLA PEDATIFIDA; ASCLEPIAS TUBEROSA; AMBROSIA CORONOPIFOLIA; LIATRIS ASPERA; APOCYNUM ANDROSAEMIFOLIUM; PENSTEMON GRANDIFLORUS; SISYRINCHIUM CAMPESTRE; TRADESCANTIA OCCIDENTALIS; CAMPANULA ROTUNDIFOLIA; HELIANTHEMUM BICKNELLII; OENOTHERA BIENNIS; STIPA SPARTEA; ARTEMISIA (CAUDATA) CAMPESTRIS; POLYGALA POLYGAMA; PETALOSTEMUM PURPUREUM; LATHYRUS VENOSUS; CORYLUS AMERICANUS; OXYBAPHUS HIRSUTUS; LITHOSPERMUM CANESCENS; CHENOPODIUM LEPTOPHYLLUM; PANICUM CAPILLARE; QUERCUS ELLIPSOIDALIS; RHUS GLABRA; HELIANTHUS LAETIFLORUS; CALAMAGROSTIS CANADENSIS; STACHYS PALUSTRIS; SOLIDAGO GRAMINIFOLIA; SPOROBOLUS SP; SPOROBOLUS CRYPTANDRUS; MOLLUGO VERTICILLATA; ASCLEPIAS SP; COREOPSIS PALMATA; MISCELLANEOUS GRASSES; LEERSIA ORYZOIDES; PRUNUS SP; POTENTILLA ARGUTA; QUERCUS MACROCARPA; MUHLENBERGIA RACEMOSA; QUERCUS SP; MISCELLANEOUS WOODY PLANTS; SOLANUM SP. (AMERICANUS); HELIANTHUS GIGANTEUS; VERONICASTRUM VIRGINICUM; ASTER SIMPLEX; Cedar Creek; Giganteus; Recta; Saint-Paul; Campanula rotundifolia
• Online Access: http://hdl.handle.net/10255/dryad.28265; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.799401.2/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.