Portsmuth2005
Data contributor: Angelika Portsmuth
Email: angelika.portsmuth@gmail.com
Address:
- Institute of Ecology, Tallinn University, Uus-Sadama 5, Tallinn 10120, Estonia
Citation: Portsmuth A, Niinemets U, Truus L and Pensa M (2005). 'Biomass allocation and growth rates in Pinus sylvestris are interactively modified by nitrogen and phosphorus availabilities and by tree size and age.' Canadian Journal of Forest Research, 35(10), pp. 2346-2359.
DOI: 10.1139/x05-155
Abstract: Biomass allocation and growth of Scots pine, Pinus sylvestris L., of various sizes (height 0.03-20m) and ages (1-151years) were investigated in two infertile sites (raised bog and sand dunes) to determine relative nitrogen and phosphorus limitations on productivity and their interactions and size-dependent controls. Dry mass weighted average nitrogen ({NW)} and phosphorus ({PW)} contents were higher in P. sylvestris in sand dunes than in those in the raised bog, but {PW/NW} ratios overlapped between the sites. Leaf dry mass ratio ({FL)} and leaf-area ratio ({LAR)} increased with {NW}, and {FL} increased with {PW.} The relative growth rate ({RG)} was more strongly associated with {PW} than with {NW.} The net assimilation rate per leaf dry mass ({NARM)} scaled positively with {PW} but not with {NW}, demonstrating that the stronger effect of {PW} on growth was due to modified biomass allocation and physiology ({RG} = {NARM} * {FL)}, while {NW} affected growth via biomass allocation. Partitioning and growth characteristics were poorly related to the {PW/NW} ratio. The overall decrease of growth in larger trees resulted from their lower {LAR} and {FL.} Increases in size further led to a lower {NW} but higher {PW.} We conclude that optimum productivity at a given {NW} requires a certain minimum {PW}, not a specific {"}non-limiting{"} {PW/NW} ratio. While nutrients affect growth by changing biomass allocation and physiological activity, size primarily modifies biomass allocation.
The dataset includes records for 55 individuals from 1 species belonging to 1 family(ies), presenting 1 functional type(s), growing in 1 condition(s) within 1 major type(s) of habitat, with data included for the following variables:
| Variable | Label | Units | N | Min | Median | Max |
|---|---|---|---|---|---|---|
| latitude | Latitude | deg | 55 | 59 | 59 | 59 |
| longitude | Longitude | deg | 55 | 25 | 25 | 26 |
| a.lf | Leaf area | m2 | 52 | 0.0013 | 0.066 | 3.5 |
| a.stba | Stem area at base | m2 | 53 | 0.0000015 | 0.000032 | 0.0016 |
| h.t | Height | m | 53 | 0.032 | 0.26 | 1.6 |
| d.ba | Basal diameter | m | 53 | 0.0014 | 0.0064 | 0.045 |
| m.lf | Leaf mass | kg | 55 | 0.000083 | 0.0051 | 0.38 |
| m.st | Total stem mass | kg | 55 | 0.000049 | 0.0031 | 0.85 |
| m.so | Aboveground mass | kg | 55 | 0.00016 | 0.0096 | 1.2 |
| m.rf | Fine root mass | kg | 54 | 0.0000078 | 0.00086 | 0.026 |
| m.rc | Coarse root mass | kg | 55 | 0.000032 | 0.0037 | 0.62 |
| m.rt | Total root mass | kg | 55 | 0.000044 | 0.0045 | 0.63 |
| m.to | Total mass | kg | 55 | 0.00031 | 0.013 | 1.5 |
| ma.ilf | Leaf mass per area | kg m-2 | 51 | 0.049 | 0.073 | 0.14 |
| n.lf | Leaf [nitrogen] | kg kg-1 | 52 | 0.0044 | 0.0088 | 0.013 |
| n.rc | Coarse root [nitrogen] | kg kg-1 | 51 | 0.0023 | 0.004 | 0.0098 |
And locally within the country:
The sites sampled are:
| Location | Longitude | Latitude | Vegetation |
|---|---|---|---|
| Kalevi-Liiva | 25.02 | 59.47 | Temperate forest |
| Mannikjarve raba | 26.25 | 58.86 | Temperate forest |
The growing conditions of sampled plants was:
| Location | growingCondition |
|---|---|
| Kalevi-Liiva | field wild |
| Mannikjarve raba | field wild |
| Species | Family | Pft |
|---|---|---|
| Pinus sylvestris | Pinaceae | evergreen gymnosperm |
Sampling strategy: 2005 paper 'Biomass allocation and growth rates in Pinus sylvestris are interactively modified by nitrogen and phosphours availabilities and by tree size and age' in the journal 'Canadian Journal of Forest Research'
Leaf area: Total leaf area for each needle age-class (current, 1 year, 2 year) was calculated as the total dry mass of the needles in a specific age class divided by the age-class specific estimate of LMA. Individual needle areas were calculated from needle length and circumference, assuming a needle cross section geometry as a half-ellipse.
Stem cross sectional area: trunk diameter from soil level cm measured with caliper
Height: trunk height cm from soil level to the trunk top
Biomass: ALL DRY MASS at least 48 H at 75oC
Traits: projected leaf area from above (cm2) - measured from photograph taken above the tree; projected leaf area from side (cm2) measured from the photograph taken from the side of the tree; projected trunk area from above (cm2)-measured from photograph taken above the tree; projected trunk area from side (cm2) measured from the photograph taken from the side of the tree; projected crown area from above (cm2) measured from photograph taken above the tree leaves and woody parts together; projected crown area from side (cm2) measured from the photograph taken from the side of the tree -leaves and woody parts together; coarse root N% - method described in paper.
Growth environment: Field, wild
Year collected: 2000
Acknowledgements: Estonian Science Foundation (grant 5702) and the Estonian Ministry of Education and Science (grant 0182468As03)
This is how the study Portsmuth2005 fits in the entire dataset (grey). each colour represents a species. A legend of species names with colours is included at the end for reports with 1 < n < 20 species.
