CWT-LTER Data Set Summary

Accession: 4057 CWT Research Theme: Organic Matter/Decomposition
Contributors: Catherine Pringle, ,
Title: Terrestrial-Stream Biodiversity Litter Processing Datasets from Watershed 20 within the Coweeta Hydrologic Laboratory, Otto, NC
Abstract: Although litter decomposition is a fundamental ecological process, most of our understandings comes from studies of single-species decay. Recently, litter-mixing studies have tested whether monoculture data can be applied to mixed-litter systems. These studies have mainly attempted to detect non-additive effects of litter mixing, which address potential consequences of random species loss -- the focus is not on which species are lost, but the decline in diversity per se. Under global change, species loss is likely to be non-random, with some species more vulnerable to extinction than others. Under such scenarios, the effects of individual species (additivity) as well as of species interactions (non-additivity) on decomposition rates are of interest. To examine potential impacts of non-random species loss on ecosystems, we studied additive and non-additive effects of litter mixing on decomposition. A full-factorial litterbag experiment was conducted using four deciduous leaf species, from which mass loss and nitrogen content were measured. This study was conducted at the Coweeta Hydrologic Laboratory in Watershed 20 on Ball Creek that drains into Coweeta Creek, a tributary of the Little Tennessee River. Data were analyzed using a statistical approach that first looks for additive identiy effects based on the presence or absence of species and then significant species interactions occurring beyond those. It partitions non-additive effects into those caused by richness and/ or composition. This approach addresses questions key to understanding the potential effects of species loss on ecosystem processes. If additive effects dominate, the consequences for decomposition dynamics will be predictable based on our knowledge of individual species, but not statistically predictable if non-additive effects dominate.
Key Words: biodiversity, decomposition, ecosystem function, leaf litter, litter, litter decomposition, litter mixtures, litter quality, movement of organic matter, non-random species loss, species composition, species diversity
LTER Core Area: Movement of Organic Matter
CWT Themes: Organic Matter/Decomposition, Aquatic Invertebrate Ecology, Aquatic Macroinvetebrate Ecology, Fungal Productivity, General Nutrient Chemistry
Study Type: Coweeta Terrestrial Study
Study Period: 01-Oct-2003 to 31-Jul-2004
Site References:
BALLCRK -- Ball Creek, Macon County, North Carolina, USA
CWTBASIN -- Coweeta Basin, Macon County, North Carolina, USA
» View/Download data set geography: Google Maps, Google Earth
Downloads: 

Data Table: 4057_Biota_Data (Terrestrial-Stream Biodiversity Biota Data for dataset 4057, 240)

Access: Public (released 23-Jun-2014)

Metadata: Text (ESA FLED), Basic EML, Complete EML

Data Formats: Spreadsheet CSV Text Format, EML-described Text Format, Tab-delimited Text Report with Statistical Summary, GCE Data Toolbox Format, Standard MATLAB Variables Format

Column List:

Column Name Units Type Description (hide)
1 Time days floating-point Time in days; represents the sampling day from when leaf packs were deployed on January 10, 2004 along a 75-m reach of Ball Creek. Litter was incubated in Ball Creek from January 10, 2004 to July 31, 2004.
2 Block None alphanumeric string A block represents one of the four replicate blocks. A block is a stream location, and four stream locations were utilized in this study.
3 Richness None integer Richness is the number of species present in mixed species packs (2, 3, or 4). In a single-species pack, the richness is 1.
4 Treatment None integer Treatment; Packs within each experimental block were grouped in array of 15 treatments. Each treatment number directly corresponds to a particular species composition in a leaf pack. For instance, Treatment "1" corresponds to Composition "L" (Liriodendron tulipifera). There are 15 possible single species and mixed-species combinations.
5 Composition None alphanumeric string Tree species composition refers to which particular species are present together in mixed-species packs (tulip poplar, Liriodendron tulipifera [L]; red maple, Acer rubrum [A]; chestnut oak, Quercus prinus [Q]; and rhododendron, Rhododendron maximum [R]).
6 Bacteria_Biomass mg/g floating-point Bacteria biomass (mg/g AFDM)
7 Fungi_Biomass mg/g floating-point Fungi biomass (mg/g AFDM)
8 Invertebrate_Abundance number/g floating-point Invertebrate abundance (# per g AFDM)
9 Invertebrate_Richness None integer Invertebrate richness (per leaf pack)
10 Invertebrate_Shannons_Evenness None floating-point Invertebrate Shannon's Evenness (per leaf pack)
11 Invertebrate_Simpsons _Diversity None floating-point Invertebrate Simpson's Diversity (per leaf pack)

Data Table: 4057_Chemistry_Data (Terrestrial-Stream Biodiversity Chemistry Data for dataset 4057, 532)

Access: Public (released 23-Jun-2014)

Metadata: Text (ESA FLED), Basic EML, Complete EML

Data Formats: Spreadsheet CSV Text Format, EML-described Text Format, Tab-delimited Text Report with Statistical Summary, GCE Data Toolbox Format, Standard MATLAB Variables Format

Column List:

Column Name Units Type Description (hide)
1 Time days floating-point Time in days; represents the sampling day from when leaf packs were deployed on January 10, 2004 along a 75-m reach of Ball Creek. Litter was incubated in Ball Creek from January 10, 2004 to July 31, 2004.
2 Block None alphanumeric string A block represents one of the four replicate blocks.
3 Treatment None integer Treatment; Packs within each experimental block were grouped in array of 15 treatments. Each treatment number directly corresponds to a particular species composition in a leaf pack. For instance, Treatment "1" corresponds to Composition "L" (Liriodendron tulipifera). There are 15 possible single species and mixed-species combinations.
4 Richness None integer # of leaf litter species; Richness is the number of species present in mixed species packs (2, 3, or 4). In a single-species pack, the richness is 1.
5 Composition None alphanumeric string Tree species composition refers to which particular species are present together in mixed-species packs (tulip poplar, Liriodendron tulipifera [L]; red maple, Acer rubrum [A]; chestnut oak, Quercus prinus [Q]; and rhododendron, Rhododendron maximum [R]).
6 AFDM g floating-point Ash Free Dry Mass
7 Percent_AFDM % floating-point % Ash Free Dry Mass
8 C_N Ratio floating-point % Carbon:% Nitrogen ratio (both per unit AFDM)
9 Percent_C % floating-point % Carbon per unit AFDM
10 Percent_N % floating-point % Nitrogen per unit AFDM
11 Percent_P % floating-point % Total Phosphorus per unit AFDM
12 Percent_Cellulose % floating-point % Cellulose per unit AFDM
13 Percent_Hemicellulose % floating-point % Hemicellulose per unit AFDM
14 Percent_Lignin % floating-point % Lignin per unit AFDM
15 Percent_Condensed_Tannins % floating-point % Condensed Tannins per unit AFDM
16 Percent_Hydrolysable_Tannins % floating-point % Hydrolyzable Tannins per unit AFDM
17 Percent_Total_Phenolics % floating-point % Total Phenolics per unit AFDM