DOI: 10.5061/dryad.b8gtht7kg
title: Data from: The effect of drainage on the fine root biomass, production, and turnover in hemiboreal old-growth forests on organic soils

description: Information on the capacity of organic soils to capture and store carbon
 in old-growth forests in the hemiboreal forest zone is scarce and
 fragmented. However, fine root data can provide valuable insights into
 soil carbon fluxes. Thus, the aim of the current study was to provide
 estimates of the fine root biomass (FRB), fine root production (FRP), and
 fine root turnover (FRT) rate by tree species and other functional groups
 in old-growth (stand age 131–179 years) forests on mesotrophic organic
 soils dominated by Scots pine (Pinus sylvestris L.), with (drained
 mesotrophic organic soil) and without (undrained mesotrophic organic soil)
 the effects of forest drainage. The sequential soil coring method was used
 to estimate the FRB and FRP. The total FRB (sum of the FRB of all
 functional groups) was significantly higher in the undrained sites
 (6.8±0.3 t ha 1) than in the drained sites (3.97±0.1 t ha 1). The FRB of
 Scots pine in the undrained forest was significantly higher (1.7±0.1 t ha
 1) than in the drained forest (0.5±0.1 t ha 1), supporting an extensive
 foraging strategy. The significantly higher mean FRB of Norway spruce
 (Picea abies [L.] Karst.) (1.4±0.1 t ha 1) in the drained sites than the
 undrained sites (0.7±0.2 t ha-1) can be explained by there being a higher
 proportion of spruce in the stand compositions, thus a higher standing
 volume (cubic meters per hectare) of this species and an increased FRB.
 The FRB of dwarf shrubs (2.43±0.2 t ha-1) formed the largest part of the
 total FRB in the undrained sites and the second largest (1.16±0.1 t ha-1),
 following Norway spruce, in the drained sites. The total FRP was similar
 between the undrained (2.05±0.31 t ha-1 yr-1) and drained (1.82±0.26 t
 ha-1 yr-1) stands. However, considerable variability in the FRP was
 observed between different sites of the same forest site type. The FRT
 rate of Scots pine was twice as high in the drained sites than the
 undrained sites, suggesting faster nutrient and carbon input into the
 drained soil compared to the undrained soil. Estimates of FRB, FRP, and
 FRT rate for different functional groups can be used in carbon-cycle
 modeling and in further calculations to estimate the carbon budget
 (balance) in forests on organic soils.
description: # The effect of drainage on the fine root biomass, production, and
 turnover in hemiboreal old-growth forests on organic soils
 ## #GWL\_temp.csv This
 file contains data on study site soil temperature and groundwater level ##
 Description of the data and file structure Date - Sampling date Site -
 Study object name FT - Forest type (ND - not drained, KS - drained) Year -
 Sampling year Cycle - Sampling campaign number in specific sampling year
 PL - Sample plot of study object (1-3) Groundwater - Groundwater level
 depth from the ground surface, cm Soil_temp_10cm - Soil temperature at
 10cm depth, °C Soil_temp_20cm - Soil temperature at 20cm depth, °C
 Soil_temp_30cm - Soil temperature at 30cm depth, °C Soil_temp_40cm - Soil
 temperature at 40cm depth, °C --- ## #Soil\_data.csv This file contains
 data of study site soil analysis ## Description of the data and file
 structure Year - Sampling year Date - Sampling date Place - Study objects
 name FT - Forest type (ND - not drained, KS - drained) Soil_cm - Soil
 sampling depth Repetition - Number of repetitions (1-2) Soil_density -
 Soil bulk density, g/kg C_g_kg - Carbon content in sample, g/kg N_g_kg -
 Nitrogen content in sample, g/kg C_N - Carbon and Nitrogen ratio in sample
 pHKCl - Soil pH Pkop_g_kg - Total Phosphorus content in sample, g/kg
 K_mg_kg - Total Potassium content in sample, g/kg Ca_mg_kg - Total Calcium
 content in sample, g/kg Mg_mg_kg - Total Magnesium content in sample, g/kg
 --- ## #FRP\_data.csv This file contains data of study site fine-root
 biomass, stand taxation indices and soil analysis per study object sample
 plot and fine-root fraction ## Description of the data and file structure
 ID - Study site ID Place - Study object name FT - Forest type (ND - not
 drained, KS - drained) Cycle - Sampling campaign number in specific
 sampling year PL - Sampling plot number Fraction - Fine-root fraction by
 name FRB - Fine-root biomass, t/ha FRB_BA - Fine-root biomass per basal
 area Pine_yield - Pine tree growing stock, m3/ha N_ha - Tree count per ha
 Spruce_yield - Spruce tree growing stock, m3/ha Shrub_percentage -
 Percentage of shrubs in ground vegetation Herb_percentage - Percentage of
 herbacous plants in ground vegetation D - Diameter at breast height, cm
 G_m2ha - basal area, m2/ha CN - soil C and N ratio pHKCl - soil pH CgKg -
 Soil Carbon (C) content, g/kg NgKg - Soil Nitrogen (N) content, g/kg ---
 ## #Mean\_FRB\_pa\_frakcijam.csv This file contains data of study site
 average fine-root biomass per study object sample plot and fine-root
 fraction ## Description of the data and file structure ID - Study site ID
 Object - Study object name FT - Forest type (ND - not drained, KS -
 drained) PL - Sampling campaign number in specific sampling year Fraction
 - Fine-root fraction by name AvgFRB - Average fine-root biomass, t/ha
 FRB_BA - Average fine-root biomass per basal area Sd - Standarddeviation
 of average fine-root biomass n - sampling campaign count se -
 Standarderror of average fine-root biomass Basal_Area - basal area, m2/ha
 --- ## #PCA\_analize.csv This file contains data of study site for PCA
 analysis containing fine-root biomass, production and turnover, taxation
 indices and soil data per sample plot ## Description of the data and file
 structure ID - Study site ID Site - Study object name FT - Forest type (ND
 - not drained, KS - drained) Plot - - Sampling plot number SP_FRB - Scots
 pine fine-root biomass, t/ha SP_FRP - Scots pine fine-root production,
 t/ha/yr SP_T - Scots pine fine-root turnover, t/yr PineFRB_BA - Scots pine
 fine-root biomass per stand basal area, t/m2 NS_FRB - Norway spruce
 fine-root biomass, t/ha NS_FRP - Norway spruce fine-root production,
 t/ha/yr NS_T - Norway spruce fine-root turnover, t/yr SpurceFRB_BA -
 Norway spruce fine-root biomass per stand basal area, t/m2 H_FRB - Herb
 fine-root biomass, t/ha DS_FRB - Dwarf shrub fine-root biomass, t/ha
 DS_FRP - Dwarf shub fine-root production, t/ha/yr TOT_FRP - Total
 fine-root production, t/ha/yr SP_dFRB - Scots pine fine-root necromass,
 t/ha NS_dFRB - Norway spruce fine-root necromass, t/ha C_g_kg - Soil
 Carbon content, g/kg N_g_kg - Soil Nitrogen content, g/kg C_N - Carbon and
 Nitrogen ratio in sample pHKCl - Soil pH Pkop - Total soil Phosphorous
 content, g/kg Aug_bl - Soil bulk density, g/kg Dg - Diameter at breast
 height, cm Hg - Tree height, m G - basal area, m2/ha Yield_1st - First
 layer tree growing stock, m3/ha N_ha - Tree count per ha SP_m3ha - Pine
 tree growing stock, m3/ha NS_m3ha - Spruce tree growing stock, m3/ha DS_m2
 - Dwarf shrub coverage, m2 H_m2 - Herbacous plant coverage, m2 --- ##
 #R\_frb.csv This file contains raw data of fine-root samples per site,
 sample plot, fraction and sampling depth ## Description of the data and
 file structure Place - Study objects name ID - Sample ID CM - Sampling
 depth, cm Fraction - Fine-root fraction ID Species - Fine-root fraction by
 name Status - Fine-root status (living/dead) Weight_g - Sample weight FT -
 Forest type (ND - not drained, KS - drained) FRB - Fine-root biomass, t/ja
 Cycle - Sampling campaign number ID_cycle - Sample ID per sampling cycle
 PL - Sampling plot number Place_pl_cm_cycle - ID containing study object
 name, forest type, sampling depth and sampling cycle ## Sharing/Access
 information Correspondence: Valters Samariks, Latvian State Forest
 Research Institute "Silava", Latvia, Salaspils, Rīgas street
 111, LV-2169, Email: ; ORCID:
 0000-0001-9953-0455 ## Code Code for this data file is available in
 Fine_root_calculations_DRYAD.R