# Soil solution chemistry in Detrital Input and Removal Treatments (DIRT) from the Andrews Experimental Forest, 1999-2019 ## Dataset - **Database Code:** TN021 - **Title:** Soil solution chemistry in Detrital Input and Removal Treatments (DIRT) from the Andrews Experimental Forest, 1999-2019 - **Abstract:** The Detrital Input and Removal Treatment (DIRT) Project was established to assess how rates and sources of plant litter inputs influence accumulations or losses of organic matter in forest soils. DIRT employs chronic additions and exclusions of aboveground litter inputs and exclusion of root ingrowth to permanent plots at eight forested and two shrub/grass sites in the northern hemisphere to investigate how soil organic matter (SOM) dynamics are influenced by plant detrital inputs across ecosystem and soil types. The long-term DIRT study at the H.J. Andrews Experimental Forest was established in an old-growth forest stand on the valley floor and aims to address how detrital quality and quantity control soil organic matter accumulation and stabilization. The DIRT plots consist of treatments that double leaf litter, double woody debris inputs, exclude aboveground litter inputs, remove root inputs via trenching, or remove all organic matter inputs. We measured changes in soil solution chemistry with depth, and conducted long-term incubations of bulk soils from different treatments in order to elucidate effects of detrital inputs on the relative amounts and lability of different soil C pools. These data include various properties of the DIRT plots obtained during re-measurements at various intervals. C and N concentrations and content in soil, CO2 efflux, and soil solution chemistry are measured from bulk samples to 1 m depth, field respiration measurements, and lysimeters at 2 depths, respectively, and assessed at Oregon State University. - **Keywords:** biogeochemistry; decomposition; carbon cycling; litterfall; nutrients; terrestrial ecosystems - **Temporal coverage:** 1999-12-01 to 2011-04-15 - **Principal Investigator:** Kate Lajtha ## Data Entities 1. TN02101 2. TN02102 3. TN02103 4. TN02104 5. TN02105 ## Entity 1: TN02101 ### Attribute list - **DBCODE** — varchar, enum Database Code (assigned by FSDB data manager) - **TN021** — FSDB database code TN021 - **ENTITY** — numeric(1), range 1.0000 1.0000, number Entity number (data table number) - **YEAR** — numeric(1), range 1999.0000 1999.0000, year (yyyy) Year of sampling - **FRACTION** — varchar, enum Density fraction of carbon in g/cm3 - **1.65** — 1.65 g/cm3 density fraction of carbon - **1.85** — 1.85 g/cm3 density fraction of carbon - **2.4** — 2.4 g/cm3 density fraction of carbon - **2.65** — 2.65 g/cm3 density fraction of carbon - **>2.65** — >2.65 g/cm3 density fraction of carbon - **2.0** — 2.0 g/cm3 density fraction of carbon - **SAMPLE_NO** — numeric(1), range 1.0000 18.0000, number Sample Code - **PLOT** — varchar, enum Plot Code - **DIRT_01** — HJA DIRT Plot 01 - **DIRT_02** — HJA DIRT Plot 02 - **DIRT_03** — HJA DIRT Plot 03 - **DIRT_04** — HJA DIRT Plot 04 - **DIRT_05** — HJA DIRT Plot 05 - **DIRT_06** — HJA DIRT Plot 06 - **DIRT_07** — HJA DIRT Plot 07 - **DIRT_08** — HJA DIRT Plot 08 - **DIRT_10** — HJA DIRT Plot 10 - **DIRT_11** — HJA DIRT Plot 11 - **DIRT_12** — HJA DIRT Plot 12 - **DIRT_13** — HJA DIRT Plot 13 - **DIRT_14** — HJA DIRT Plot 14 - **DIRT_16** — HJA DIRT Plot 16 - **DIRT_17** — HJA DIRT Plot 17 - **DIRT_19** — HJA DIRT Plot 19 - **DIRT_49** — HJA DIRT Plot 49 - **DIRT_69** — HJA DIRT Plot 69 - **TREAT** — varchar, enum Treatment - **2x litter** — Double litter - aboveground inputs are doubled by adding litter from No Litter plots. - **2x wood** — Double wood - woody inputs are doubled by dding shredded course woody debris. - **control** — Control - normal litter inputs are allowed. - **no input** — No Inputs - combined treatments from No Litter and No Roots treatments. - **no root** — NoRoots - roots are excluded by inserting barriers around plots in backfilled trenches. - **no litter** — No Litter - Aboveground inputs are prevented by seasonal removals. - **SOIL_MASS_WET** — numeric(1), range 50.0000 50.0900, grams Mass of soil sample prior to drying - **SOIL_MASS_DRY** — numeric(1), range 0.0000 46.4600, grams Dry mass of soil sample at 50 degrees celcius - **PCT_C_ALL** — numeric(1), range 0.0000 100.0000, percent Average %C in all soil fractions of the soil sample - **PCT_N_ALL** — numeric(1), range 0.0000 100.0000, percent Average %N in all soil fractions of the soil sample - **SOIL_MASS_FRACTION** — numeric(1), range 0.8000 28.9000, grams Dry mass of soil subsample fraction at 50 degrees celcius - **PCT_C_FRACTION** — numeric(1), range 0.0000 100.0000, percent Percent C in the dried subsample fraction - **PCT_N_FRACTION** — numeric(1), range 0.0000 100.0000, percent Percent N in the dried subsample fraction - **MGC_GSOIL_FRACTION** — numeric(1), range 0.0100 53.5000, milligrams millgrams of C per gram of subsample fraction - **MGC_FRACTION_GSOIL_ALL** — numeric(1), range 0.2400 1160.3500, milligrams per gram milligrams of C in fraction per gram of bulk soil - **MGN_GSOIL_FRACTION** — numeric(1), range 0.0800 42.8200, milligrams milligrams of N per gram of subsample fraction - **MGN_FRACTION_GSOIL_ALL** — numeric(1), range 0.0200 934.4400, milligrams per gram milligrams of N in fraction per gram of bulk soil ## Entity 2: TN02102 ### Attribute list - **DBCODE** — varchar, enum Database Code (assigned by FSDB data manager) - **TN021** — FSDB database code TN021 - **ENTITY** — numeric(1), range 2.0000 2.0000, number Entity number (data table number) - **SAMPLE** — numeric(1), range 1.0000 18.0000, number randomly assigned sample number to determine uniqueness of dataset - **YEAR** — numeric(1), range 1999.0000 1999.0000, year (yyyy) Year of sampling - **SOIL_MASS_WET** — numeric(1), range 4.9000 5.9000, grams Mass of soil sample prior to drying - **SOIL_MASS_50C** — numeric(1), range 4.4000 5.5800, grams mass of the soil sample dried at 50 degrees C - **MOISTURE_50C** — numeric(1), range 0.0500 0.1400, number moisture of the soil sample dried at 50 degrees C (soil_mass_wet - soil_mass_50c/soil_mass_50c) - **SOIL_MASS_100C** — numeric(1), range 4.3000 5.4600, grams mass of the soil sample dried at 100 degrees C - **MOISTURE_100C** — numeric(1), range 0.0700 0.2000, number moisture of the soil sample dried at 100 degrees C (soil_mass_wet - soil_mass_100c/soil_mass_100c) ## Entity 3: TN02103 ### Attribute list - **DBCODE** — varchar, enum Database Code (assigned by FSDB data manager) - **TN021** — FSDB database code TN021 - **ENTITY** — numeric(1), range 3.0000 3.0000, number Entity number (data table number) - **YEAR** — numeric(1), range 1999.0000 1999.0000, year (yyyy) Year of sampling - **FRACTION** — varchar, enum Density fraction of carbon in g/cm3 - **1.65** — 1.65 g/cm3 density fraction of carbon - **1.85** — 1.85 g/cm3 density fraction of carbon - **2.4** — 2.4 g/cm3 density fraction of carbon - **2.65** — 2.65 g/cm3 density fraction of carbon - **>2.65** — >2.65 g/cm3 density fraction of carbon - **2.0** — 2.0 g/cm3 density fraction of carbon - **TREAT** — varchar, enum Treatment - **2x litter** — Double litter - aboveground inputs are doubled by adding litter from No Litter plots. - **2x wood** — Double wood - woody inputs are doubled by dding shredded course woody debris. - **control** — Control - normal litter inputs are allowed. - **no input** — No Inputs - combined treatments from No Litter and No Roots treatments. - **no root** — NoRoots - roots are excluded by inserting barriers around plots in backfilled trenches. - **no litter** — No Litter - Aboveground inputs are prevented by seasonal removals. - **AVG_C** — numeric(1), range 0.4400 37.0200, milligrams per gram average mg C per gram of soil - **AVG_N** — numeric(1), range 0.0200 0.8200, milligrams per gram average mg N per gram of soil ## Entity 4: TN02104 ### Attribute list - **DBCODE** — varchar, enum Database Code (assigned by FSDB data manager) - **TN021** — FSDB database code TN021 - **ENTITY** — numeric(1), range 4.0000 4.0000, number Entity number (data table number) - **COLLDATE** — datetime, freetext date of collection - **DEPTH** — varchar, enum Lysimeter depth - **30** — 30 cm depth - **100** — 100 cm depth - **TREAT** — varchar, enum Treatment - **2x litter** — Double litter - aboveground inputs are doubled by adding litter from No Litter plots. - **2x wood** — Double wood - woody inputs are doubled by dding shredded course woody debris. - **control** — Control - normal litter inputs are allowed. - **no input** — No Inputs - combined treatments from No Litter and No Roots treatments. - **no root** — NoRoots - roots are excluded by inserting barriers around plots in backfilled trenches. - **no litter** — No Litter - Aboveground inputs are prevented by seasonal removals. - **DON** — numeric(1), range 0.0000 2.5500, milligrams per liter dissolved organic nitrogen - **TDN** — numeric(1), range 0.0000 6.1800, milligrams per liter total dissolved nitrogen - **NO3** — numeric(1), range 0.0000 14.1400, milligrams per liter nitrate - **NH4** — numeric(1), range 0.0000 0.5800, milligrams per liter ammonium - **DOC** — numeric(1), range 0.0000 16.9000, milligrams per liter dissolved organic carbon ## Entity 5: TN02105 ### Attribute list - **DBCODE** — varchar, enum Database Code (assigned by FSDB data manager) - **TN021** — FSDB database code TN021 - **ENTITY** — numeric(1), range 5.0000 5.0000, number Entity number (data table number) - **YEAR** — numeric(1), range 2006.0000 2010.0000, year (yyyy) Year of sampling - **PLOT** — varchar, enum Plot Code - **DIRT_01** — HJA DIRT Plot 01 - **DIRT_02** — HJA DIRT Plot 02 - **DIRT_03** — HJA DIRT Plot 03 - **DIRT_04** — HJA DIRT Plot 04 - **DIRT_05** — HJA DIRT Plot 05 - **DIRT_06** — HJA DIRT Plot 06 - **DIRT_07** — HJA DIRT Plot 07 - **DIRT_08** — HJA DIRT Plot 08 - **DIRT_10** — HJA DIRT Plot 10 - **DIRT_11** — HJA DIRT Plot 11 - **DIRT_12** — HJA DIRT Plot 12 - **DIRT_13** — HJA DIRT Plot 13 - **DIRT_14** — HJA DIRT Plot 14 - **DIRT_16** — HJA DIRT Plot 16 - **DIRT_17** — HJA DIRT Plot 17 - **DIRT_19** — HJA DIRT Plot 19 - **DIRT_49** — HJA DIRT Plot 49 - **DIRT_69** — HJA DIRT Plot 69 - **TREAT** — varchar, enum Treatment - **2x litter** — Double litter - aboveground inputs are doubled by adding litter from No Litter plots. - **2x wood** — Double wood - woody inputs are doubled by dding shredded course woody debris. - **control** — Control - normal litter inputs are allowed. - **no input** — No Inputs - combined treatments from No Litter and No Roots treatments. - **no root** — NoRoots - roots are excluded by inserting barriers around plots in backfilled trenches. - **no litter** — No Litter - Aboveground inputs are prevented by seasonal removals. - **ENZYME** — varchar, enum Enzyme measured using ester based assays - **Phosph** — Phosphatase - **BetaGlucos** — Beta Glucose - **PhenolOxy** — Phenol Oxidase - **Proteinase** — Proteinase (also termed protease or peptidase) - **ACTIVITY** — numeric(1), range 0.0000 35.0000, millimol per hour per gram millimols enzyme activity per gram*hour ## Attribute Definitions **ACTIVITY** millimols enzyme activity per gram*hour **AVG_C** average mg C per gram of soil **AVG_N** average mg N per gram of soil **COLLDATE** date of collection **DBCODE** Database Code (assigned by FSDB data manager) **DEPTH** Lysimeter depth **DOC** dissolved organic carbon **DON** dissolved organic nitrogen **ENTITY** Entity number (data table number) **ENZYME** Enzyme measured using ester based assays **FRACTION** Density fraction of carbon in g/cm3 **MGC_FRACTION_GSOIL_ALL** milligrams of C in fraction per gram of bulk soil **MGC_GSOIL_FRACTION** millgrams of C per gram of subsample fraction **MGN_FRACTION_GSOIL_ALL** milligrams of N in fraction per gram of bulk soil **MGN_GSOIL_FRACTION** milligrams of N per gram of subsample fraction **MOISTURE_50C** moisture of the soil sample dried at 50 degrees C (soil_mass_wet - soil_mass_50c/soil_mass_50c) **MOISTURE_100C** moisture of the soil sample dried at 100 degrees C (soil_mass_wet - soil_mass_100c/soil_mass_100c) **NH4** ammonium **NO3** nitrate **PCT_C_ALL** Average %C in all soil fractions of the soil sample **PCT_C_FRACTION** Percent C in the dried subsample fraction **PCT_N_ALL** Average %N in all soil fractions of the soil sample **PCT_N_FRACTION** Percent N in the dried subsample fraction **PLOT** Plot Code **SAMPLE** randomly assigned sample number to determine uniqueness of dataset **SAMPLE_NO** Sample Code **SOIL_MASS_50C** mass of the soil sample dried at 50 degrees C **SOIL_MASS_100C** mass of the soil sample dried at 100 degrees C **SOIL_MASS_DRY** Dry mass of soil sample at 50 degrees celcius **SOIL_MASS_FRACTION** Dry mass of soil subsample fraction at 50 degrees celcius **SOIL_MASS_WET** Mass of soil sample prior to drying **TDN** total dissolved nitrogen **TREAT** Treatment **YEAR** Year of sampling ## Enumerated Domains ### DBCODE - **TN021** — FSDB database code TN021 ### FRACTION - **1.65** — 1.65 g/cm3 density fraction of carbon - **1.85** — 1.85 g/cm3 density fraction of carbon - **2.4** — 2.4 g/cm3 density fraction of carbon - **2.65** — 2.65 g/cm3 density fraction of carbon - **>2.65** — >2.65 g/cm3 density fraction of carbon - **2.0** — 2.0 g/cm3 density fraction of carbon ### PLOT - **DIRT_01** — HJA DIRT Plot 01 - **DIRT_02** — HJA DIRT Plot 02 - **DIRT_03** — HJA DIRT Plot 03 - **DIRT_04** — HJA DIRT Plot 04 - **DIRT_05** — HJA DIRT Plot 05 - **DIRT_06** — HJA DIRT Plot 06 - **DIRT_07** — HJA DIRT Plot 07 - **DIRT_08** — HJA DIRT Plot 08 - **DIRT_10** — HJA DIRT Plot 10 - **DIRT_11** — HJA DIRT Plot 11 - **DIRT_12** — HJA DIRT Plot 12 - **DIRT_13** — HJA DIRT Plot 13 - **DIRT_14** — HJA DIRT Plot 14 - **DIRT_16** — HJA DIRT Plot 16 - **DIRT_17** — HJA DIRT Plot 17 - **DIRT_19** — HJA DIRT Plot 19 - **DIRT_49** — HJA DIRT Plot 49 - **DIRT_69** — HJA DIRT Plot 69 ### TREAT - **2x litter** — Double litter - aboveground inputs are doubled by adding litter from No Litter plots. - **2x wood** — Double wood - woody inputs are doubled by dding shredded course woody debris. - **control** — Control - normal litter inputs are allowed. - **no input** — No Inputs - combined treatments from No Litter and No Roots treatments. - **no root** — NoRoots - roots are excluded by inserting barriers around plots in backfilled trenches. - **no litter** — No Litter - Aboveground inputs are prevented by seasonal removals. ### DEPTH - **30** — 30 cm depth - **100** — 100 cm depth ### ENZYME - **Phosph** — Phosphatase - **BetaGlucos** — Beta Glucose - **PhenolOxy** — Phenol Oxidase - **Proteinase** — Proteinase (also termed protease or peptidase)