| Data Set Citation |
NCEAS 6840 : Harmon: Analysis of long-term litter decomposition experiments, National Center for Ecological Analysis and Synthesis, and Harmon M of Oregon State University.2007.Analysis of long-term litter decomposition experiments.
nceas.328.26
(http://knb.ecoinformatics.org/knb/metacat/nceas.328.26/nceas).
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| Data Tables, Images, and Other Entities: |
| Data Table: | predicted_pafrm_using_model_outputs_L_R.csv
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| Data Table: | int_k_coeff_and_eqn_type_L_R.csv
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| Data Table: | int_k_coeff_eqn_and_final_values_wood.csv
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| Data Table: | predicted_pafrm_using_model_outputs_wood.csv
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| Data Table: | output_from_nlin_model_runs_L_R.csv
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| Data Table: | output_from_nlin_model_runs_wood_r2.csv
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| Data Table: | integrated_k_values_leaf_root.csv
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| Offline Distribution Info: |
| Medium: | digital |
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| Data Set Owner(s): |
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Organization: | NCEAS 6840 : Harmon: Analysis of long-term litter decomposition experiments |
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Organization: | National Center for Ecological Analysis and Synthesis |
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Individual: | Mark Harmon |
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Organization: | Oregon State University |
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| Metadata Provider(s): |
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Individual: | Callie Bowdish |
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| Abstract: |
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| Although numerous short-term experiments have been used to develop conceptual and simulation models of decomposition, very little is known about the later stages of this process. Exclusion of this later stage has led, at best, to incomplete understanding of ecosystem carbon and nitrogen dynamics. This working group examined the wealth of litter and decomposition data that has been produced by several recent long-term field experiments. Our analysis will initially be based on data from LIDET (Long-term Intersite Decomposition Experiment Team), a 27-site experiment conducted over a 10-year period. |
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| Additional Information: |
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| The raw data used to generate this data set is at the TD023 - LTER Intersite Fine Litter Decomposition Experiment (LIDET) website. This site indcludes metadata that may be relevant to some of this data set.
http://www.fsl.orst.edu/lter/data/abstract.cfm?dbcode=TD023&topnav=1 |
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| Geographic Coverage: |
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Geographic Description: | Sites Ranging from British Columbia to Panama |
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Bounding Coordinates:
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| West: | -139.3308 degrees
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| East: | -79.8478 degrees
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| North: | 59.8456 degrees
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| South: | 9.1506 degrees
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| Access Control: |
| Auth System: | knb |
| Order: | denyFirst |
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| Contact: |
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Individual: | Mark Harmon |
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Organization: | Oregon State University |
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Address: |
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| Methods Info: |
| Step 1: |
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Description:
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| Experiment Design |
The major factors to be considered in this experiment will be site, species of and type of litter (leaves, vs. roots vs dowels), and time. Twenty-one sites, representing a wide array of moisture and temperature conditions, will be used for litter incubations. Ten types of 'standard' litters will be sent to each site. These include three types of fine roots (graminoid, hardwood, and conifer), six types of leaf litter (which range in lignin/nitrogen ratio from 5 to 75), and wooden dowels. Samples will be collected ten times; the time between samples will be one year for all sites except LaSelva and Luquillo which will collect samples every three months. There will be four replicates for each species, site and time.
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| Step 2: |
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Description:
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| Equations used in SAS proc NLIN to model decomp. Rate (k), m0 (intercept), s0 (stable portion) |
Input raw field data: MPAFRM=mean percent ashfree remaining mass
MTIMEOUT=years sample decomposed
Model 1 MPAFRM = (m0*EXP(-k*MTIMEOUT)); (no force intercept)
Model 2 MPAFRM = (m0*EXP(-k*mtimeout)); (forced intercept)
Model 3 MPAFRM = (m0*EXP(-k*TIMEout))+s0; (stable portion)
Model 4 MPAFRM = ((100 - s0)*EXP(-k*MTIMEOUT))+ s0; (stable portion forced intercept)
Model 5 MPAFRM = (m0f*EXP(-kf*MTIMEOUT))+(100-m0f)*exp(-ks*MTIMEOUT); (k fast and k slow, dual model)
Model 6 MPAFRM = (m0*EXP(-k*MTIMEOUT)); (last 4 years only)
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| Step 3: |
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Description:
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| Integrated-k calculations |
1. Calculate predicted remaining mass over long time period using best fit k and intercept from nlin output.
PredPAFRM = (M0F * exp(-KF*TIMEOUT)) + (100 - M0F) * exp(-KS * TIMEOUT);
run;
2. Sum the predicted masses
3. Calculate Integrated k: =100/sumpred*-1;
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Sampling Area And Frequency:
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| The data used for analysis is from TD023 Intersite Fine litter Decomposition Experiment (LIDET) More information on the methods of collecting the data is at: http://www.fsl.orst.edu/lter/data/abstractdetail.cfm?dbcode=TD023&topnav=1 |
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Sampling Description:
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| In addition to the standard litters, each site will be represented by a 'wildcard' litter which appears at one site for each sample collection. The purpose of the wildcard species is to verify the predictions from the standard species. There will be four replicates for each wildcard species, site and time. |
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