Weight and nutrient content of understorey vegetation in biomass subplots in August 2012 in the exploratory region in Finland

Usage Rights

This data is Free within projects.

FunDiv-intern

Dataset Abstract

Most of the plant diversity in European forests is found in the understorey, and despite its relatively low biomass compared to the forest overstorey, its functional importance is high (nectar source for pollinators, habitat for small mammals, affects tree regeneration, invasion resistance, decomposition and nutrient cycling (Gilliam 2007). Relationships between overstorey and understorey diversity and composition is tackled. For each of the plots per focal region, the core plot is divided in nine quadrants.For each of the plots per focal region, the core plot is divided in nine quadrants. In three quadrants (upper right, central, lower left), a vegetation subplot of 5 m x 5 m (as close as possible to the central quadrant; subplot in the central quadrant located in the upper half) is marked for identification and estimation of cover of understorey vascular plant species. Location of subplots exclude major heterogeneities at any scale of sampling (tree trunks, tracks and paths, streams and ponds, peaty pools, boulders and cliffs…). Thus, terricolous plants growing on mineral and organic soil of the undisturbed forest floor are represented. Within this subplot, understorey vegetation is identified (species, cover) and afterwards clipped in a zone of 0.5 m x 0.5 m (biomass subplot), where understorey vegetation is relatively abundant and where vegetation composition is representative for the whole subplot. Then, biomass is divided into 'woody' (woody juveniles, woody plants) and 'non-woody' (young seedlings, 'green' herbs). The woody fraction is further divided into 'woody-W' (part branches) and 'woody-L' (part leaves, needles).The biomass samples are dried for 24 to 48h at 70°C . Then they are weighed and analysed for P, Ca, K, Mg, C, N (Forest & Nature Lab, Ghent University).

Dataset Design

For each of the plots per focal region, the core plot is divided in nine quadrants. In three quadrants (upper right, central, lower left), a subplot of 5 m x 5 m (as close as possible to the central quadrant; subplot in the central quadrant located in the upper half) is marked for identification and estimation of cover of understorey vascular plant species. Within this subplot, understorey vegetation is identified (species, cover) and afterwards clipped in a zone of 0.5 m x 0.5 m, where understorey vegetation is relatively abundant and where vegetation composition is representative for the whole subplot. Then, biomass is divided into 'woody' (woody juveniles, woody plants) and 'non-woody' (young seedlings, 'green' herbs). The woody fraction is further divided into 'woody-W' (part branches) and 'woody-L' (part leaves, needles). Preparation of biomass samples for chemical analyses: dried at 70°C, grinded using a sieve of 1mm. Before analyses of Ca, Mg, K en P-content, grinded biomass samples are 'destroyed' with HNO3/HClO4, diluted with demineralised water and filtered according to the method of Varian Instruments at work, AA-24 (McKenzie T., 1982. Automated multielement analysis of plant material by flame atomic absorption spectroscopy. Varian Instruments at work, AA-24). Analysis for Ca-content: destruction of biomass sample with the above mentioned method. Then the sample is diluted, 10% CsCI is added as modifer on the AAS (Varian SpectrAA 220) and calibrated to 5mg Ca/l and atomized in a nitrous oxide-acetylene flame, absorption is measured at 422.7nm. The analytical quality of the analysis is verified by repeated measurement of blanco and control samples. Analysis for K-content: destruction of biomass sample with the above mentioned method. Then the sample is diluted, 10% CsCI is added as modifer on the AAS (Varian SpectrAA 220) and calibrated to 1mg K/l and atomized in a air-acetylene flame, absorption is measured at 766.5nm. The analytical quality of the analysis is verified by repeated measurement of blanco and control samples. Analysis for Mg-content: destruction of biomass sample with the above mentioned method. Then the sample is diluted, 10% CsCI is added as modifer on the AAS (Varian SpectrAA 220) and calibrated to 0.5mg Mg/l and atomized in a air-acetylene flame, absorption is measured at 258.2nm. The analytical quality of the analysis is verified by repeated measurement of blanco and control samples. Analysis for P-content: destruction of biomass sample with the above mentioned method, then reaction of the destroyed biomass sample with metholsulphite, ammoniumheptamolybdate and sodiumacetate solution. Finally, measurement of the total P-content with a spectrophotometer type Varian Cary 50 at 700nm (Chemical analysis of plants and soils. Cottenie, Verloo,... Laboratory of analytical and agrochemistry, RUG). Analyses for C, N: analysis is done using an Elementar analyzer, type Vario Macro Cube in configuration CNS, with Argon as carrier gas. Catalytic combustion of the sample (1.5g) is carried out at a permanent temperature of up to 1200°C. This is followed by reduction of the combustion gasses on hot copper in the refuction tube. The formed gasses N2, CO2, H2O, SO2 are separated via purge and trep chromatography and afterwards detected on a thermal conductivity detector (TCD). A connected PC computes the element concentration from the detector signal, and the sample weight on the basis of stored calibration curves.

Spatial Extent

Finland

Temporal Extent

Summer 2012

Taxonomic Extent

Understorey vegetation: woody and non-woody vascular species (herbs, seedlings) < 1.3m

Measurement Circumstances

Overall dry weather

Data columns available in the raw data part of this dataset

plot number
unique number ascribed to each plot
Data group: Exploratory plot id
Values
FIN05
FIN02
FIN01
FIN03
FIN04
subplot number
indicates which subplot within the plot is considered
Data group: Sub plot id
Values
10c
11a
10a
11b
10b
diversity
Number of target tree species present in subplot
Data group: Species richness
Keywords: diversity
Values
1
3
2
target Picea abies
Absence/presence of Picea abies in overstorey as target tree species
Data group: Presence data
Values
0
1
target Pinus sylvestris
Absence/presence of Pinus sylvestris in overstorey as target tree species
Data group: Presence data
Values
1
0
target Betula pendula
Absence/presence of Betula pendula in overstorey as target tree species
Data group: Presence data
Values
0
1
Weight non-woody
Weight of non-woody biomass present in biomass sample
Unit: g
Data group: Biomass
Keywords: process, understorey productivity
Values
0.132
0.061
0
0.137
0.096
* These persons could not be matched within the portal: Maxime Eeraerts also contributed to this column.
K non-woody
K content of non-woody biomass present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, K
Values
12935.819327731093
14182.265774378586
14114.547837483615
11149.055555555557
10689.827689378486
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Ca non-woody
Ca content of non-woody biomass present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
10472.008781558727
10516.947565543074
1011.6731517509728
10244.905821917808
10343.16091954023
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Mg non-woody
Mg content of non-woody biomass present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Mg
Values
1057.3199527744982
1089.6341463414635
1000.0984251968507
1066.7584940312213
1144.9056603773586
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
P non-woody
P content of non-woody biomass present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, P
Values
1272.4704336399473
1186.626575028637
1306.5010351966876
1401.434034416826
1250.519957983193
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
C non-woody
C content of non-woody biomass present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
39.914
40.218
40.09
39.17
39.787
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
N non-woody
N content of non-woody biomass present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, N
Values
0.944
1.079
0.973
1.089
1.103
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Weight woody-L
Weight of woody biomass (part leaves, needles) present in biomass sample
Unit: g
Data group: Biomass
Keywords: process, understorey productivity
Values
0.065
0
0.067
0.004
0.151
* These persons could not be matched within the portal: Maxime Eeraerts also contributed to this column.
K woody-L
K content of woody biomass (part leaves, needles) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, K
Values
12434.078212290506
3793.7939110070256
3999.186046511628
2886.4640883977904
17907.078986587185
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Ca woody-L
Ca content of woody biomass (part leaves, needles) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
13376.367614879651
11217.416378316033
10578.715728715732
10205.040871934603
13158.850226928898
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Mg woody-L
Mg content of woody biomass (part leaves, needles) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Mg
Values
1351.5151515151517
1222.2159730033743
1289.3805309734516
1343.661971830986
1065.103448275862
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
P woody-L
P content of woody biomass (part leaves, needles) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, P
Values
1034.8484848484848
1016.0951834862385
1043.2413793103449
1010.9228650137742
1013.8249754178958
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
C woody-L
C content of woody biomass (part leaves, needles) present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
46.084
45.392
43.824
45.873
42.948
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
N woody-L
N content of woody biomass (part leaves, needles) present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, N
Values
0.927
0.936
0.962
0.993
0.95
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Weight woody-W
Weight of woody biomass (part branches) present in biomass sample
Unit: g
Data group: Biomass
Keywords: process, understorey productivity
Values
0.106
0.056
0.066
0
0.143
* These persons could not be matched within the portal: Maxime Eeraerts also contributed to this column.
K woody-W
K content of woody biomass (part branches) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, K
Values
2046.3696369636962
2614.7563176895305
2817.043399638336
2600.2844141069395
2683.3984375000005
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Ca woody-W
Ca content of woody biomass (part branches) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
2469.4161260426317
1881.925522252498
1759.7192224622033
2403.5846724351054
2069.7445972495093
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
Mg woody-W
Mg content of woody biomass (part branches) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, Mg
Values
1020.0086058519795
1010.048076923077
1001.4644351464435
1072.4999999999998
1002.959927140255
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
P woody-W
P content of woody biomass (part branches) present in biomass sample
Unit: mg/kg
Data group: Biomass nutrient concentration
Keywords: process, P
Values
1038.73417721519
1030.7207718501704
1036.8572778827977
1030.7013769363166
1011.4908722109534
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
C woody-W
C content of woody biomass (part branches) present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, Ca
Values
45.667
46.496
45.765
45.729
45.697
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.
N woody-W
N content of woody biomass (part branches) present in biomass sample
Unit: %
Data group: Biomass nutrient concentration
Keywords: process, N
Values
0.64
0.655
0.619
0.678
0.682
* These persons could not be matched within the portal: Luc Willem, Greet De bruyn also contributed to this column.