Rodriguez2003
Data contributor: Rolando Rodríguez
Email: rorodrig@udec.cl
Address:
- Facultad Ciencias Forestales, Universidad de Concepción. Victoria 631, Barrio Universitario, Concepción, Región del Biobío, Chile
Citation: Rodríguez R, Espinosa M, Hofmann G and Marchant M (2003). 'Needle mass, fine root and stem wood production in response to silvicultural treatment, tree size and competitive status in radiata pine stands.' Forest Ecology and Management, 186(1-3), pp. 287-296.
DOI: 10.1016/S0378-1127(03)00300-1
Abstract: The effect of silvicultural regime, tree size and competitive status on needle mass, root fine production and allocation of carbon to stem wood was analyzed. Three stands with different agroforestry treatments were compared with one managed traditionally. Data were obtained through destructive sampling of 36 trees and analyzed by {ANOVA} and regression analysis. The analysis allowed us to conclude that foliage mass was not affected by the silvicultural treatment, tree size or competitive status. Fine root biomass showed an inverse relationship with fertilization. Growth efficiency was not affected by the management treatment, tree size, or intraspecific competition. The greater stem wood allocation recorded in the agroforestry treatment than in the forestry regime, is interpreted as a response to two different types of competition. Competition for light appears to induce growth in height and diameter as a function of local environment conditions. Competition for nutrients appears to reduce allocation to fine roots and increase allocation to stem wood.
The dataset includes records for 36 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 | 36 | -34 | -34 | -34 |
| longitude | Longitude | deg | 36 | -72 | -72 | -72 |
| a.ssbh | Sapwood area at breast height | m2 | 36 | 0.024 | 0.1 | 0.67 |
| a.stbh | Stem area at breast height | m2 | 36 | 0.026 | 0.1 | 0.23 |
| h.t | Height | m | 36 | 16 | 24 | 29 |
| d.bh | Dbh | m | 36 | 0.18 | 0.36 | 0.54 |
| h.bh | Height of d.bh measurement | m | 36 | 1.3 | 1.3 | 1.3 |
| m.lf | Leaf mass | kg | 36 | 13 | 68 | 179 |
| m.sb | Bark mass | kg | 36 | 10 | 46 | 166 |
| m.st | Total stem mass | kg | 36 | 81 | 439 | 1172 |
| m.so | Aboveground mass | kg | 36 | 94 | 510 | 1351 |
| m.br | Branch mass | kg | 36 | 20 | 123 | 434 |
| m.rf | Fine root mass | kg | 16 | 5.8 | 14 | 20 |
| m.rc | Coarse root mass | kg | 16 | 1.9 | 3.6 | 12 |
| m.rt | Total root mass | kg | 16 | 9.7 | 19 | 25 |
| m.to | Total mass | kg | 16 | 116 | 487 | 1369 |
And locally within the country:
The sites sampled are:
| Location | Longitude | Latitude | Vegetation |
|---|---|---|---|
| Corporacion Nacional Forestal, in Tanume, community of Pichilemu, VI Region, Chile | -71.88 | -34.15 | Temperate forest |
The growing conditions of sampled plants was:
| Location | Grouping | growingCondition |
|---|---|---|
| Corporacion Nacional Forestal, in Tanume, community of Pichilemu, VI Region, Chile | Treatment = T1 | field experimental |
| Corporacion Nacional Forestal, in Tanume, community of Pichilemu, VI Region, Chile | Treatment = T2 | field experimental |
| Corporacion Nacional Forestal, in Tanume, community of Pichilemu, VI Region, Chile | Treatment = T3 | field experimental |
| Corporacion Nacional Forestal, in Tanume, community of Pichilemu, VI Region, Chile | Treatment = T4 | field experimental |
| Species | Family | Pft |
|---|---|---|
| Pinus radiata | missing | evergreen gymnosperm |
Sampling strategy: In permanent plots, diameter at breast height was measured in all trees to obtain diametric amplitude in each treatment. The trees of each treatment were then divided into three equal amplitude classes, representing the intermediate, codominant and dominant crown classes. For each treatment and crown classes, three trees were selected randomly. This gives nine trees per treatment, making a total of 36 trees in the entire sample.
Leaf area: Leaf area was determined with a Li-Cor 3100 measuring device, using a subsample of 12 needles which were subsequently dried at 100oC for 24 hours and weighed with a precision of 0.01 g. The sum of the sections constitutes the leaf area of the tree (projected leaf area).
Stem cross sectional area: Disks of 2 to 3 cm of width at diameter at breast height (Dbh), and after that every 3.5 m, include a disk at the base of the live crown. The disks were photographed with a digital camera in the laboratory. Each disk was placed on an aluminum platform, where the digital camera was mounted. Measurements of hertwood and total area were made using digital photographs and georeferred using Arcinfo 7.2 NT software. This allowed to estimate the sapwood area at Dbh level by difference.
Height: Felling trees were measured directely using instrument.
Crown area: Before felling crown projection in all four cardinal direction were measured. Crown areas were estimated assuming a conic shape of the crowns with a height H and a radius equal to the mean crown radius where the crown was widest.
Biomass: Dry mass of the crown was estimated from the proportions of dry mass of each crown component and the total green mass of each section measured of the crown in the field. Wood and bark biomass as the product between the volume and anhydride density. Root biomass as the product of the potentially available areas for root mass and soil area samples. The sum of all trees components gives the dry mass of the tree.
Traits: Silvopastoral in cluster and bands and 185 trees/ha. Forestry plantations at 490 trees/ha.
Growth environment: Field experimental.
Other variables: Prairies
Year collected: 2002
This is how the study Rodriguez2003 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.
