Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1993 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 1995
• 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 OLIGOSANTHES; PANICUM PERLONGUM; POA PRATENSIS; LESPEDEZA CAPITATA; AMBROSIA ARTEMISIIFOLIA ELATIOR; BERTEROA INCANA; MISCELLANEOUS HERBS; RUDBECKIA SEROTINA; PHYSALIS HETEROPHYLLA; AGROSTIS SCABRA; ACER NEGUNDO; ACHILLEA MILLEFOLIUM(LANULOSA); ERIGERON CANADENSIS; ERIGERON STRIGOSUS; EUPHORBIA GLYPTOSPERMA; HEDEOMA HISPIDA; SILENE ANTIRRHINA; TRAGOPOGON DUBIUS (MAJOR); ANEMONE CYLINDRICA; ARABIS SP; ASCLEPIAS SYRIACA; POLYGONUM CONVOLVULUS; LYCHNIS ALBA; FORB SEEDLINGS; FUNGI; CYPERUS SP; POTENTILLA RECTA; PRUNUS PENSYLVANICA; SETARIA LUTESCENS (GLAUCA); PINUS STROBUS; ARABIS DIVARICARPA; CHENOPODIUM ALBUM; VERBASCUM THAPSUS; PANICUM PRAECOCIOUS; ARISTIDA BASIRAMEA; SOLIDAGO NEMORALIS; TRADESCANTIA OCCIDENTALIS; OENOTHERA BIENNIS; POLYGALA POLYGAMA; MISCELLANEOUS LEGUMES; SISYRINCHIUM CAMPESTRE; EQUISETUM LAEVIGATUM; SOLIDAGO RIGIDA; PHYSALIS VIRGINIANA; RUMEX ACETOSELLA; POLYGONUM TENUE; LEPIDIUM DENSIFLORUM; HIERACIUM LONGIPILUM; ANDROPOGON GERARDI; LIATRIS ASPERA; TRIFOLIUM SP; CAREX SP; GNAPHALIUM OBTUSIFOLIUM; ERAGROSTIS SPECTABILIS; LACTUCA SP; ROSA ARKANSANA; PRUNUS SP; RUBUS SP; AMBROSIA CORONOPIFOLIA; ARTEMISIA LUDOVICIANA; ASCLEPIAS TUBEROSA; ASTER AZUREUS; LITHOSPERMUM CAROLINIENSE; CAMPANULA ROTUNDIFOLIA; EUPHORBIA COROLLATA; SORGHASTRUM NUTANS; VIOLA PEDATIFIDA; OXYBAPHUS HIRSUTUS; LITHOSPERMUM CANESCENS; STIPA SPARTEA; LATHYRUS VENOSUS; HELIANTHEMUM BICKNELLII; PENSTEMON GRANDIFLORUS; ASTER ERICOIDES; SMILACINA RACEMOSA; ARTEMISIA (CAUDATA) CAMPESTRIS; PETALOSTEMUM PURPUREUM; DELPHINIUM VIRESCENS; RANUNCULUS RHOMBOIDEUS; HELIANTHUS LAETIFLORUS; CALAMAGROSTIS CANADENSIS; JUNCUS SP; STACHYS PALUSTRIS; RHUS GLABRA; SOLIDAGO GRAMINIFOLIA; MISCELLANEOUS GRASSES; CREPIS TECTORUM; QUERCUS BOREALIS-ELLIPSOIDALIS; COREOPSIS PALMATA; ASCLEPIAS SP; COMANDRA RICHARDSIANA; LEERSIA ORYZOIDES; HELIANTHUS GIGANTEUS; VIOLA SAGITTATA; VERONICASTRUM VIRGINICUM; POTENTILLA ARGUTA; VIOLA SP; ASTER SIMPLEX; QUERCUS MACROCARPA; Cedar Creek; Giganteus; Recta; Saint-Paul; Campanula rotundifolia
• Online Access: http://hdl.handle.net/10255/dryad.27365; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.799301.2/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.