Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data
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 larg...
Format: | Dataset |
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Language: | unknown |
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1986
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Online Access: | http://hdl.handle.net/10255/dryad.29263 http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.798401.2/xml |
id |
ftdryad:oai:v1.datadryad.org:10255/dryad.29263 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
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 AGROSTIS SCABRA ARISTIDA BASIRAMEA MISCELLANEOUS GRASSES CYPERUS SP ACHILLEA MILLEFOLIUM(LANULOSA) AMBROSIA ARTEMISIIFOLIA ELATIOR BERTEROA INCANA ERIGERON CANADENSIS ERIGERON STRIGOSUS HEDEOMA HISPIDA LEPIDIUM DENSIFLORUM POLYGONUM CONVOLVULUS POTENTILLA RECTA SILENE ANTIRRHINA FRAGARIA VIRGINIANA VERBASCUM THAPSUS PANICUM OLIGOSANTHES CREPIS TECTORUM RUDBECKIA SEROTINA TRAGOPOGON DUBIUS (MAJOR) ARABIS HIRSUTA SCHIZACHYRIUM SCOPARIUM POA PRATENSIS EUPHORBIA GLYPTOSPERMA OENOTHERA BIENNIS LYCHNIS ALBA ANEMONE CYLINDRICA PANICUM PRAECOCIOUS RUMEX ACETOSELLA ARABIS GLABRA LECHEA STRICTA LESPEDEZA CAPITATA HIERACIUM LONGIPILUM POLYGONUM TENUE ERIGERON ANUUS MISCELLANEOUS HERBS ARTEMISIA (CAUDATA) CAMPESTRIS SOLIDAGO SPECIOSA ERAGROSTIS SPECTABILIS TRIFOLIUM REPENS PENSTEMON GRACILIS AMBROSIA CORONOPIFOLIA MOLLUGO VERTICILLATA MELILOTUS SP FUNGI MELILOTUS ALBA ANDROPOGON GERARDI PHYSALIS HETEROPHYLLA LIATRIS ASPERA SOLIDAGO NEMORALIS SOLIDAGO RIGIDA HIERACIUM SP GNAPHALIUM OBTUSIFOLIUM OENOTHERA SP TYPHA GLAUCA PHYSALIS VIRGINIANA CYPERUS SCHWEINITZII LITHOSPERMUM CAROLINIENSE EQUISETUM LAEVIGATUM POLYGALA POLYGAMA ROSA ARKANSANA SETARIA LUTESCENS (GLAUCA) CAREX SP HELIANTHEMUM BICKNELLII LITHOSPERMUM CANESCENS ARTEMISIA LUDOVICIANA ASTER AZUREUS PENSTEMON GRANDIFLORUS SORGHASTRUM NUTANS ASCLEPIAS TUBEROSA VIOLA PEDATIFIDA OXYBAPHUS HIRSUTUS PANICUM PERLONGUM CAMPANULA ROTUNDIFOLIA EUPHORBIA COROLLATA SISYRINCHIUM CAMPESTRE VIOLA SP PETALOSTEMUM PURPUREUM STIPA SPARTEA TRADESCANTIA OCCIDENTALIS CHENOPODIUM ALBUM VICIA VILLOSA LATHYRUS VENOSUS RHUS GLABRA RUBUS SP HELIANTHUS LAETIFLORUS SOLIDAGO GRAMINIFOLIA RANUNCULUS RHOMBOIDEUS CORYLUS AMERICANUS QUERCUS MACROCARPA MISCELLANEOUS SP ANTENNARIA NEGLECTA MUHLENBERGIA RACEMOSA VIOLA PEDATA COREOPSIS PALMATA COMANDRA RICHARDSIANA PRUNUS PUMILA ASCLEPIAS SYRIACA CALAMOVILFA LONGIFOLIA ARISTIDA SP ASCLEPIAS SP POTENTILLA SIMPLEX HELIANTHUS GIGANTEUS ASPARAGUS OFFICINALIS SCLERIA TRIGLOMERATA PHLOX PILOSA VIOLA SAGITTATA LOBELIA SPICATA SENECIO SP ASTER SIMPLEX VERONICASTRUM VIRGINICUM STACHYS PALUSTRIS CALAMAGROSTIS CANADENSIS CALAMOVILFA SP |
spellingShingle |
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 AGROSTIS SCABRA ARISTIDA BASIRAMEA MISCELLANEOUS GRASSES CYPERUS SP ACHILLEA MILLEFOLIUM(LANULOSA) AMBROSIA ARTEMISIIFOLIA ELATIOR BERTEROA INCANA ERIGERON CANADENSIS ERIGERON STRIGOSUS HEDEOMA HISPIDA LEPIDIUM DENSIFLORUM POLYGONUM CONVOLVULUS POTENTILLA RECTA SILENE ANTIRRHINA FRAGARIA VIRGINIANA VERBASCUM THAPSUS PANICUM OLIGOSANTHES CREPIS TECTORUM RUDBECKIA SEROTINA TRAGOPOGON DUBIUS (MAJOR) ARABIS HIRSUTA SCHIZACHYRIUM SCOPARIUM POA PRATENSIS EUPHORBIA GLYPTOSPERMA OENOTHERA BIENNIS LYCHNIS ALBA ANEMONE CYLINDRICA PANICUM PRAECOCIOUS RUMEX ACETOSELLA ARABIS GLABRA LECHEA STRICTA LESPEDEZA CAPITATA HIERACIUM LONGIPILUM POLYGONUM TENUE ERIGERON ANUUS MISCELLANEOUS HERBS ARTEMISIA (CAUDATA) CAMPESTRIS SOLIDAGO SPECIOSA ERAGROSTIS SPECTABILIS TRIFOLIUM REPENS PENSTEMON GRACILIS AMBROSIA CORONOPIFOLIA MOLLUGO VERTICILLATA MELILOTUS SP FUNGI MELILOTUS ALBA ANDROPOGON GERARDI PHYSALIS HETEROPHYLLA LIATRIS ASPERA SOLIDAGO NEMORALIS SOLIDAGO RIGIDA HIERACIUM SP GNAPHALIUM OBTUSIFOLIUM OENOTHERA SP TYPHA GLAUCA PHYSALIS VIRGINIANA CYPERUS SCHWEINITZII LITHOSPERMUM CAROLINIENSE EQUISETUM LAEVIGATUM POLYGALA POLYGAMA ROSA ARKANSANA SETARIA LUTESCENS (GLAUCA) CAREX SP HELIANTHEMUM BICKNELLII LITHOSPERMUM CANESCENS ARTEMISIA LUDOVICIANA ASTER AZUREUS PENSTEMON GRANDIFLORUS SORGHASTRUM NUTANS ASCLEPIAS TUBEROSA VIOLA PEDATIFIDA OXYBAPHUS HIRSUTUS PANICUM PERLONGUM CAMPANULA ROTUNDIFOLIA EUPHORBIA COROLLATA SISYRINCHIUM CAMPESTRE VIOLA SP PETALOSTEMUM PURPUREUM STIPA SPARTEA TRADESCANTIA OCCIDENTALIS CHENOPODIUM ALBUM VICIA VILLOSA LATHYRUS VENOSUS RHUS GLABRA RUBUS SP HELIANTHUS LAETIFLORUS SOLIDAGO GRAMINIFOLIA RANUNCULUS RHOMBOIDEUS CORYLUS AMERICANUS QUERCUS MACROCARPA MISCELLANEOUS SP ANTENNARIA NEGLECTA MUHLENBERGIA RACEMOSA VIOLA PEDATA COREOPSIS PALMATA COMANDRA RICHARDSIANA PRUNUS PUMILA ASCLEPIAS SYRIACA CALAMOVILFA LONGIFOLIA ARISTIDA SP ASCLEPIAS SP POTENTILLA SIMPLEX HELIANTHUS GIGANTEUS ASPARAGUS OFFICINALIS SCLERIA TRIGLOMERATA PHLOX PILOSA VIOLA SAGITTATA LOBELIA SPICATA SENECIO SP ASTER SIMPLEX VERONICASTRUM VIRGINICUM STACHYS PALUSTRIS CALAMAGROSTIS CANADENSIS CALAMOVILFA SP Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
topic_facet |
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 AGROSTIS SCABRA ARISTIDA BASIRAMEA MISCELLANEOUS GRASSES CYPERUS SP ACHILLEA MILLEFOLIUM(LANULOSA) AMBROSIA ARTEMISIIFOLIA ELATIOR BERTEROA INCANA ERIGERON CANADENSIS ERIGERON STRIGOSUS HEDEOMA HISPIDA LEPIDIUM DENSIFLORUM POLYGONUM CONVOLVULUS POTENTILLA RECTA SILENE ANTIRRHINA FRAGARIA VIRGINIANA VERBASCUM THAPSUS PANICUM OLIGOSANTHES CREPIS TECTORUM RUDBECKIA SEROTINA TRAGOPOGON DUBIUS (MAJOR) ARABIS HIRSUTA SCHIZACHYRIUM SCOPARIUM POA PRATENSIS EUPHORBIA GLYPTOSPERMA OENOTHERA BIENNIS LYCHNIS ALBA ANEMONE CYLINDRICA PANICUM PRAECOCIOUS RUMEX ACETOSELLA ARABIS GLABRA LECHEA STRICTA LESPEDEZA CAPITATA HIERACIUM LONGIPILUM POLYGONUM TENUE ERIGERON ANUUS MISCELLANEOUS HERBS ARTEMISIA (CAUDATA) CAMPESTRIS SOLIDAGO SPECIOSA ERAGROSTIS SPECTABILIS TRIFOLIUM REPENS PENSTEMON GRACILIS AMBROSIA CORONOPIFOLIA MOLLUGO VERTICILLATA MELILOTUS SP FUNGI MELILOTUS ALBA ANDROPOGON GERARDI PHYSALIS HETEROPHYLLA LIATRIS ASPERA SOLIDAGO NEMORALIS SOLIDAGO RIGIDA HIERACIUM SP GNAPHALIUM OBTUSIFOLIUM OENOTHERA SP TYPHA GLAUCA PHYSALIS VIRGINIANA CYPERUS SCHWEINITZII LITHOSPERMUM CAROLINIENSE EQUISETUM LAEVIGATUM POLYGALA POLYGAMA ROSA ARKANSANA SETARIA LUTESCENS (GLAUCA) CAREX SP HELIANTHEMUM BICKNELLII LITHOSPERMUM CANESCENS ARTEMISIA LUDOVICIANA ASTER AZUREUS PENSTEMON GRANDIFLORUS SORGHASTRUM NUTANS ASCLEPIAS TUBEROSA VIOLA PEDATIFIDA OXYBAPHUS HIRSUTUS PANICUM PERLONGUM CAMPANULA ROTUNDIFOLIA EUPHORBIA COROLLATA SISYRINCHIUM CAMPESTRE VIOLA SP PETALOSTEMUM PURPUREUM STIPA SPARTEA TRADESCANTIA OCCIDENTALIS CHENOPODIUM ALBUM VICIA VILLOSA LATHYRUS VENOSUS RHUS GLABRA RUBUS SP HELIANTHUS LAETIFLORUS SOLIDAGO GRAMINIFOLIA RANUNCULUS RHOMBOIDEUS CORYLUS AMERICANUS QUERCUS MACROCARPA MISCELLANEOUS SP ANTENNARIA NEGLECTA MUHLENBERGIA RACEMOSA VIOLA PEDATA COREOPSIS PALMATA COMANDRA RICHARDSIANA PRUNUS PUMILA ASCLEPIAS SYRIACA CALAMOVILFA LONGIFOLIA ARISTIDA SP ASCLEPIAS SP POTENTILLA SIMPLEX HELIANTHUS GIGANTEUS ASPARAGUS OFFICINALIS SCLERIA TRIGLOMERATA PHLOX PILOSA VIOLA SAGITTATA LOBELIA SPICATA SENECIO SP ASTER SIMPLEX VERONICASTRUM VIRGINICUM STACHYS PALUSTRIS CALAMAGROSTIS CANADENSIS CALAMOVILFA SP |
description |
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. |
format |
Dataset |
title |
Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
title_short |
Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
title_full |
Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
title_fullStr |
Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
title_full_unstemmed |
Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data |
title_sort |
long-term nitrogen deposition: effects on plant diversity, composition, productivity and stability. year 1984 aboveground biomass data |
publishDate |
1986 |
url |
http://hdl.handle.net/10255/dryad.29263 http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.798401.2/xml |
op_coverage |
The Cedar Creek Natural History Area is located in Anoka and Isanti counties, approximately 30 miles north of Saint Paul, MN. CCNHA lies at the boundary between prairie and forest. It is a mosaic of uplands dominated by oak savanna, prairie, hardwood forest, pine forests,and abandoned agricultural fields and of lowlands comprised of ash and cedar swamps, acid bogs, marshes, and sedge meadows. Large tracts of the pre-agricultural ecosystems of the region are preserved within its boundaries, as is a successional chronosequence of more than 80 old fields of known history. -93.22445 W -93.16289 E 45.44138 N 45.384865 S 1982 to 2006 1984 |
long_lat |
ENVELOPE(-129.954,-129.954,54.598,54.598) ENVELOPE(62.500,62.500,-67.567,-67.567) ENVELOPE(-60.515,-60.515,-62.932,-62.932) ENVELOPE(-57.715,-57.715,51.467,51.467) |
geographic |
Cedar Creek Giganteus Recta Saint-Paul |
geographic_facet |
Cedar Creek Giganteus Recta Saint-Paul |
genre |
Campanula rotundifolia |
genre_facet |
Campanula rotundifolia |
op_relation |
http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.798401.2/xml knb-lter-cdr.798401.2 http://hdl.handle.net/10255/dryad.29263 |
op_rights |
Code of Ethics and Rules for Use of Cedar Creek LTER and Related DataAs a condition for access to data provided by researchers of the Cedar Creek LTER, I, the data user, agrees to abide by the following code of ethics.I agree to notify the Cedar Creek LTER scientists who gathered data if I would like to use those data in any publication. I acknowledge that these data were gathered by Cedar Creek scientists because they had already perceived the importance of these data for a variety of scientific and societal issues. I will provide them with formal recognition that, at their discretion, may include co-authorship or acknowledgements on publications. I realize that the researchers who gathered these data may be using them for scientific analyses, papers or publications that are currently planned or in preparation, and that such activities have precedence over any that I might wish to prepare. In this case, my preparation of any work may be delayed, at the option of the Cedar Creek researchers involved, until their work is completed. Because it may be possible to misinterpret a data set if it is taken out of context, I will seek the assistance and opinion of those Cedar Creek researchers involved in the design of a study and the collection of the data as I analyze the data. Moreover, I realize that this computer data set is not complete, and it may contain errors. The complete data set includes extensive written documentation, which should be referenced to reduce the chance of errors in data and errors of interpretation. |
_version_ |
1766383858077401088 |
spelling |
ftdryad:oai:v1.datadryad.org:10255/dryad.29263 2023-05-15T15:48:45+02:00 Long-Term Nitrogen Deposition: Effects on Plant Diversity, Composition, Productivity and Stability. Year 1984 Aboveground biomass data The Cedar Creek Natural History Area is located in Anoka and Isanti counties, approximately 30 miles north of Saint Paul, MN. CCNHA lies at the boundary between prairie and forest. It is a mosaic of uplands dominated by oak savanna, prairie, hardwood forest, pine forests,and abandoned agricultural fields and of lowlands comprised of ash and cedar swamps, acid bogs, marshes, and sedge meadows. Large tracts of the pre-agricultural ecosystems of the region are preserved within its boundaries, as is a successional chronosequence of more than 80 old fields of known history. -93.22445 W -93.16289 E 45.44138 N 45.384865 S 1982 to 2006 1984 1986 text/plain http://hdl.handle.net/10255/dryad.29263 http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.798401.2/xml unknown http://metacat.lternet.edu/knb/metacat/knb-lter-cdr.798401.2/xml knb-lter-cdr.798401.2 http://hdl.handle.net/10255/dryad.29263 Code of Ethics and Rules for Use of Cedar Creek LTER and Related DataAs a condition for access to data provided by researchers of the Cedar Creek LTER, I, the data user, agrees to abide by the following code of ethics.I agree to notify the Cedar Creek LTER scientists who gathered data if I would like to use those data in any publication. I acknowledge that these data were gathered by Cedar Creek scientists because they had already perceived the importance of these data for a variety of scientific and societal issues. I will provide them with formal recognition that, at their discretion, may include co-authorship or acknowledgements on publications. I realize that the researchers who gathered these data may be using them for scientific analyses, papers or publications that are currently planned or in preparation, and that such activities have precedence over any that I might wish to prepare. In this case, my preparation of any work may be delayed, at the option of the Cedar Creek researchers involved, until their work is completed. Because it may be possible to misinterpret a data set if it is taken out of context, I will seek the assistance and opinion of those Cedar Creek researchers involved in the design of a study and the collection of the data as I analyze the data. Moreover, I realize that this computer data set is not complete, and it may contain errors. The complete data set includes extensive written documentation, which should be referenced to reduce the chance of errors in data and errors of interpretation. 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 AGROSTIS SCABRA ARISTIDA BASIRAMEA MISCELLANEOUS GRASSES CYPERUS SP ACHILLEA MILLEFOLIUM(LANULOSA) AMBROSIA ARTEMISIIFOLIA ELATIOR BERTEROA INCANA ERIGERON CANADENSIS ERIGERON STRIGOSUS HEDEOMA HISPIDA LEPIDIUM DENSIFLORUM POLYGONUM CONVOLVULUS POTENTILLA RECTA SILENE ANTIRRHINA FRAGARIA VIRGINIANA VERBASCUM THAPSUS PANICUM OLIGOSANTHES CREPIS TECTORUM RUDBECKIA SEROTINA TRAGOPOGON DUBIUS (MAJOR) ARABIS HIRSUTA SCHIZACHYRIUM SCOPARIUM POA PRATENSIS EUPHORBIA GLYPTOSPERMA OENOTHERA BIENNIS LYCHNIS ALBA ANEMONE CYLINDRICA PANICUM PRAECOCIOUS RUMEX ACETOSELLA ARABIS GLABRA LECHEA STRICTA LESPEDEZA CAPITATA HIERACIUM LONGIPILUM POLYGONUM TENUE ERIGERON ANUUS MISCELLANEOUS HERBS ARTEMISIA (CAUDATA) CAMPESTRIS SOLIDAGO SPECIOSA ERAGROSTIS SPECTABILIS TRIFOLIUM REPENS PENSTEMON GRACILIS AMBROSIA CORONOPIFOLIA MOLLUGO VERTICILLATA MELILOTUS SP FUNGI MELILOTUS ALBA ANDROPOGON GERARDI PHYSALIS HETEROPHYLLA LIATRIS ASPERA SOLIDAGO NEMORALIS SOLIDAGO RIGIDA HIERACIUM SP GNAPHALIUM OBTUSIFOLIUM OENOTHERA SP TYPHA GLAUCA PHYSALIS VIRGINIANA CYPERUS SCHWEINITZII LITHOSPERMUM CAROLINIENSE EQUISETUM LAEVIGATUM POLYGALA POLYGAMA ROSA ARKANSANA SETARIA LUTESCENS (GLAUCA) CAREX SP HELIANTHEMUM BICKNELLII LITHOSPERMUM CANESCENS ARTEMISIA LUDOVICIANA ASTER AZUREUS PENSTEMON GRANDIFLORUS SORGHASTRUM NUTANS ASCLEPIAS TUBEROSA VIOLA PEDATIFIDA OXYBAPHUS HIRSUTUS PANICUM PERLONGUM CAMPANULA ROTUNDIFOLIA EUPHORBIA COROLLATA SISYRINCHIUM CAMPESTRE VIOLA SP PETALOSTEMUM PURPUREUM STIPA SPARTEA TRADESCANTIA OCCIDENTALIS CHENOPODIUM ALBUM VICIA VILLOSA LATHYRUS VENOSUS RHUS GLABRA RUBUS SP HELIANTHUS LAETIFLORUS SOLIDAGO GRAMINIFOLIA RANUNCULUS RHOMBOIDEUS CORYLUS AMERICANUS QUERCUS MACROCARPA MISCELLANEOUS SP ANTENNARIA NEGLECTA MUHLENBERGIA RACEMOSA VIOLA PEDATA COREOPSIS PALMATA COMANDRA RICHARDSIANA PRUNUS PUMILA ASCLEPIAS SYRIACA CALAMOVILFA LONGIFOLIA ARISTIDA SP ASCLEPIAS SP POTENTILLA SIMPLEX HELIANTHUS GIGANTEUS ASPARAGUS OFFICINALIS SCLERIA TRIGLOMERATA PHLOX PILOSA VIOLA SAGITTATA LOBELIA SPICATA SENECIO SP ASTER SIMPLEX VERONICASTRUM VIRGINICUM STACHYS PALUSTRIS CALAMAGROSTIS CANADENSIS CALAMOVILFA SP dataset 1986 ftdryad 2020-01-01T14:50:50Z 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. Dataset Campanula rotundifolia Dryad Digital Repository (Duke University) Cedar Creek ENVELOPE(-129.954,-129.954,54.598,54.598) Giganteus ENVELOPE(62.500,62.500,-67.567,-67.567) Recta ENVELOPE(-60.515,-60.515,-62.932,-62.932) Saint-Paul ENVELOPE(-57.715,-57.715,51.467,51.467) |