Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1991 Aboveground biomass data

• Format: Dataset
• Language: unknown
• Published: 1993
• 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; ARISTIDA BASIRAMEA; AMBROSIA ARTEMISIIFOLIA ELATIOR; BERTEROA INCANA; ERIGERON CANADENSIS; EUPHORBIA (SUPINA) MACULATA; HEDEOMA HISPIDA; LEPIDIUM DENSIFLORUM; POLYGONUM CONVOLVULUS; POTENTILLA RECTA; MISCELLANEOUS HERBS; PANICUM OLIGOSANTHES; PHYSALIS HETEROPHYLLA; ASCLEPIAS SYRIACA; SILENE ANTIRRHINA; POA COMPRESSA; MONARDA FISTULOSA; LYCHNIS ALBA; HIERACIUM LONGIPILUM; CAREX SP; TRAGOPOGON DUBIUS (MAJOR); ANEMONE CYLINDRICA; SETARIA LUTESCENS (GLAUCA); RUDBECKIA SEROTINA; MISCELLANEOUS GRASSES; EUPHORBIA GLYPTOSPERMA; PINUS SP; ACHILLEA MILLEFOLIUM(LANULOSA); PENSTEMON GRACILIS; ERAGROSTIS SPECTABILIS; ERIGERON STRIGOSUS; OENOTHERA BIENNIS; SISYRINCHIUM CAMPESTRE; EQUISETUM LAEVIGATUM; CYPERUS SP; PHYSALIS VIRGINIANA; RUMEX ACETOSELLA; CHENOPODIUM ALBUM; PANICUM PRAECOCIOUS; ANTENNARIA NEGLECTA; SOLIDAGO NEMORALIS; POLYGONUM TENUE; LESPEDEZA CAPITATA; SOLIDAGO RIGIDA; ANDROPOGON GERARDI; AGROSTIS SCABRA; ARABIS GLABRA; GNAPHALIUM OBTUSIFOLIUM; LACTUCA SP; VERBASCUM THAPSUS; ROSA ARKANSANA; LIATRIS ASPERA; RUBUS SP; AMBROSIA CORONOPIFOLIA; ARTEMISIA LUDOVICIANA; TRADESCANTIA OCCIDENTALIS; CAMPANULA ROTUNDIFOLIA; ASTER AZUREUS; VIOLA PEDATIFIDA; SORGHASTRUM NUTANS; OXYBAPHUS HIRSUTUS; EUPHORBIA COROLLATA; CHENOPODIUM LEPTOPHYLLUM; ASCLEPIAS TUBEROSA; POLYGALA POLYGAMA; ARTEMISIA (CAUDATA) CAMPESTRIS; LITHOSPERMUM CAROLINIENSE; STIPA SPARTEA; LITHOSPERMUM CANESCENS; LATHYRUS VENOSUS; CORYLUS AMERICANUS; HELIANTHEMUM BICKNELLII; FUNGI; RHUS GLABRA; MOLLUGO VERTICILLATA; RANUNCULUS RHOMBOIDEUS; CALAMAGROSTIS CANADENSIS; STACHYS PALUSTRIS; SOLIDAGO GRAMINIFOLIA; HELIANTHUS LAETIFLORUS; SPOROBOLUS CRYPTANDRUS; SETARIA ITALICA; PANICUM CAPILLARE; COMANDRA RICHARDSIANA; PRUNUS SP; LEERSIA ORYZOIDES; PARTHENOCISSUS INSERTA; HELIANTHUS SP; PRENANTHES RACEMOSA; POTENTILLA SIMPLEX; VERONICASTRUM VIRGINICUM; POTENTILLA ARGUTA; SOLIDAGO SP; Cedar Creek; Italica; Recta; Saint-Paul; Campanula rotundifolia
• Online Access: http://hdl.handle.net/10255/dryad.10193; http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.799101.2/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.