Exploratories microbial data 2012

Usage Rights

This data is Free within projects.

On request and only members of the project. Note that labile carbon and nitrogen, pH and potential nitrification were measured on own funds. The other variables were aquired within the project.

Dataset Abstract

The biogeochemical cycling in forest ecosystems is highly dependent on the interactions between plants and soil. Tree species affect element cycling through deposition in throughfall, litterfall, microbial activities in soil and rhizosphere processes. Tree species diversification has been suggested for maintaining forest ecosystem services and combining provisioning and supporting services with multifunctional and sustainable forestry. However, the understanding of the role of biodiversity in forests is unclear, in particular concerning the microbial diversity and activity in soils. This file contains data of bacterial metabolic diversity, microbial biomass, pH, labile carbon and nitrogen, and potential nitrification (upper layers only) in organic and upper mineral soil horizons sampled in 2012 in the 209 plots of the Exploratory Platform of the FunDivEUROPE project (http://www.fundiveurope.eu/). This Exploratory Platform is a network of comparative plots of 1-5 tree species established in existing mature forest in 6 countries. These six focal regions represent important European forest types along the gradient from boreal forest to Mediterranean forest.

Dataset Design

Samples were taken in the 209 plots (30x30 m) the Exploratory Platform of FunDivEUROPE. A soil sample was taken in 5 (corners and middle subplot) of the 9 10x10m subplots and mixed to obtain one representative composite sample from each plot.
Organic (if present) and mineral (5 cm) soil horizons were samples separately. Soils were sieved fresh (4mm), stored at 4°C and analysed within 2 weeks.

Spatial Extent

Exploratories FUnDivEurope: Finland, Germany, Italy, Poland, Spain, Romania

Temporal Extent

Soil sampling dates: Finland:18/06/2012-21/06/2012; Germany: 27/04/2012-29/04/2012; Italy: 26/03/2012-28/03/2012; Poland: 10/09/2012-12/09/2012; Spain: 12/11/2012-14/11/2012; Romania: 8/10/2012-10/10/2012

Data Analysis

Response variables:
NOTE: in this dataset, Cmic has been calculated with a kEC=0.35, but we now consider kEC=0.45 more adequate
Microbial biomass carbon (Cmic) and Nitrogen (Nmic)
Ctot .
Water-content ot.
qmicot.
pHH2O pHKCl ot.
NitPot ot.
NtotCW NtotHW
CCW ClabileCtot.

Planned data analyses: mixed models, strucutural equation modelling

Data columns available in the raw data part of this dataset

Sample
sample number
Data group: Helper
Values
10A
10B
12A
11B
11A
richness
tree species richness
Data group: Species richness
Values
5
1
3
4
2
season
sampling season (spring-autumn)
Data group: Samping season
Values
spring
autumn
PlotID
fundiv plot identity
Data group: Exploratory plot id
Values
FIN05
FIN01
FIN03
FIN02
FIN04
horizon
sampling horizon (organic-mineral)
Data group: Soil horizon
Values
Organic
Mineral
DW
coefficient to transform fresh weight into dry weight
Data group: Soil variable
Values
0.23256979
0.24040913
0.223181918
0.260981191
0.24
LOI
loss on ignition
Unit: %
Data group: Soil variable
Values
0.717922849
0.69056172
0.517466697
0.777003143
0.574481802
Cmic
microbial biomass carbon
Unit: mg kg-1
Data group: Microbial biomass
Keywords: C
Values
10201.37261
10178.58897
10139.43136
1004.837251
10213.40503
Nmic
microbial biomass nitrogen
Unit: mg kg-1
Data group: Microbial biomass
Keywords: N
Values
0.723912975
1014.891956
100.5504063
1001.138513
1005.354053
Ctot
total organic carbon content
Unit: %
Data group: Microbial biomass
Keywords: C
Values
0.300852731
0.417397005
0.334001048
0.451746013
0.401489372
Water-content
gravimetric water content
Unit: %
Data group: Soil variable
Keywords: water
Values
10.71383369
10.32763533
10.43877352
10.74453592
10.05489396
qmic
microbial quotient
Unit: mg Cmic.g-1 Ctot
Data group: Microbial biomass
Keywords: C
Values
10.10415184
10.6663036
10.79086254
10.21152904
10.18348237
pHH2O
pH of soil in water
Data group: Soil variable
Keywords: pH
Values
3.66
3.98
4.13
3.83
4
pHKCl
pH of soil in KCl solution
Data group: Soil variable
Keywords: pH
Values
2.98
2.9
2.86
2.76
3.05
Diversity
indicator of metabolic (functional) diversity of bacteria
Unit: %
Data group: Diversity measure
Keywords: diversity
Values
0.12903226
0
0.096774194
0.129032258
0.032258065
NitPot
potential nitrification
Unit: mg N-NO3 . g-1 dry soil . h-1
Data group: Soil variable
Keywords: nitrification
Values
0.01
0.004
0.0097
0
0.003
NtotCW
water soluble nitrogen (cold water nitrogen)
Unit: µg.g-1
Data group: Soil variable
Keywords: N
Values
10.08322746
10.22288127
100.3137391
100.8679355
10.17551049
NtotHW
hot water nitrogen
Unit: µg.g-1
Data group: Soil variable
Keywords: N
Values
1004.241814
1030.826506
101.6964246
1015.86289
1016.028906
CCW
water soluble carbon (cold water carbon)
Unit: mg.g-1
Data group: Soil variable
Keywords: C
Values
0.046344758
0.037542916
0.050482852
0.047913339
0.050736317
Clabile
hot water carbon (labile carbon)
Unit: mg.g-1
Data group: Soil variable
Keywords: C
Values
0.069676109
0.065257288
0.071673193
0.067519415
0.05777791