Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1996 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 1998
• 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; POA PRATENSIS; LESPEDEZA CAPITATA; ACHILLEA MILLEFOLIUM(LANULOSA); POTENTILLA RECTA; PHYSALIS VIRGINIANA; MONARDA FISTULOSA; POLYGONUM CONVOLVULUS; AMBROSIA ARTEMISIIFOLIA ELATIOR; BERTEROA INCANA; LYCHNIS ALBA; CYPERUS SP; ASCLEPIAS SYRIACA; ANEMONE CYLINDRICA; MISCELLANEOUS HERBS; ANDROPOGON GERARDI; HEDEOMA HISPIDA; CHENOPODIUM ALBUM; MELILOTUS ALBA; PANICUM PRAECOCIOUS; EQUISETUM LAEVIGATUM; AGROSTIS SCABRA; PANICUM OLIGOSANTHES; RUDBECKIA SEROTINA; RUMEX ACETOSELLA; VERBASCUM THAPSUS; PHYSALIS HETEROPHYLLA; POLYGONUM TENUE; CEANOTHUS AMERICANUS; SOLIDAGO NEMORALIS; CAREX SP; ANTENNARIA NEGLECTA; LEPIDIUM DENSIFLORUM; LIATRIS ASPERA; LITHOSPERMUM CAROLINIENSE; SILENE ANTIRRHINA; SOLIDAGO RIGIDA; ERIGERON STRIGOSUS; ERAGROSTIS SPECTABILIS; CREPIS TECTORUM; FUNGI; COREOPSIS PALMATA; HIERACIUM LONGIPILUM; SETARIA LUTESCENS (GLAUCA); ROSA ARKANSANA; RUBUS SP; OXYBAPHUS HIRSUTUS; ARTEMISIA LUDOVICIANA; ASCLEPIAS TUBEROSA; ASTER AZUREUS; LITHOSPERMUM CANESCENS; FORB SEEDLINGS; APOCYNUM ANDROSAEMIFOLIUM; SORGHASTRUM NUTANS; VIOLA PEDATIFIDA; EUPHORBIA COROLLATA; PANICUM PERLONGUM; AMBROSIA CORONOPIFOLIA; TRAGOPOGON DUBIUS (MAJOR); PETALOSTEMUM PURPUREUM; VIOLA SAGITTATA; PRUNUS SP; STIPA SPARTEA; LATHYRUS VENOSUS; ASCLEPIAS OVALIFOLIA; CHENOPODIUM LEPTOPHYLLUM; ERIGERON CANADENSIS; ASTRAGALUS CANADENSIS; ARTEMISIA (CAUDATA) CAMPESTRIS; QUERCUS ELLIPSOIDALIS; RHUS GLABRA; SISYRINCHIUM CAMPESTRE; CALAMAGROSTIS CANADENSIS; QUERCUS MACROCARPA; HELIANTHEMUM BICKNELLII; HELIANTHUS LAETIFLORUS; STACHYS PALUSTRIS; HELIANTHUS GIGANTEUS; SOLIDAGO GRAMINIFOLIA; SETARIA ITALICA; TRADESCANTIA OCCIDENTALIS; COMANDRA RICHARDSIANA; LEERSIA ORYZOIDES; PRUNUS PUMILA; DIGITARIA SANGUINALIS; OENOTHERA BIENNIS; MUHLENBERGIA RACEMOSA; MISCELLANEOUS GRASSES; POLYGALA POLYGAMA; POTENTILLA ARGUTA; CAMPANULA ROTUNDIFOLIA; ASCLEPIAS SP; ASTER SIMPLEX; VERONICASTRUM VIRGINICUM; Cedar Creek; Giganteus; Italica; Recta; Saint-Paul; Campanula rotundifolia
• Online Access: http://hdl.handle.net/10255/dryad.29619; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.799601.2/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.