Changes in nutrient and fibre tissue contents in Nothofagus pumilio trees growing at site quality and crown class gradients

2022 ◽  
Vol 505 ◽  
pp. 119910
Author(s):  
Jimena E. Chaves ◽  
María V. Lencinas ◽  
Juan M. Cellini ◽  
Pablo L. Peri ◽  
Guillermo J. Martínez Pastur
Keyword(s):  
Site Quality ◽  
Nothofagus Pumilio ◽  
Tissue Contents

scholarly journals Stand growth model using volume increment/basal area ratios

2008 ◽  
Vol 54 (No. 3) ◽  
pp. 102-108 ◽  
Author(s):  
J. Martínez Pastur G ◽  
M. Cellini J ◽  
V. Lencinas M ◽  
L. Peri P
Keyword(s):  
Simple Model ◽  
Growth Models ◽  
Basal Area ◽  
Site Quality ◽  
Stand Age ◽  
Full Density ◽  
Nothofagus Pumilio ◽  
Stand Growth ◽  
Mean Error ◽  
Volume Increment

Estimation of stand growth is crucial for forest planning. Estimations were usually done using fixed values, and recently growth equations have been used. An alternative is through stand growth models. The objective was to develop a simple model for<I> Nothofagus pumilio</I> stands with full density along site quality and age gradients. The sample was obtained from 125 stands. Data on forest structure and samples for tree-ring measurement were taken in all trees to estimate growths using biometric models previously developed. The growth values of each plot during the last twenty years were calculated to fit the model, using the ratio of total volume increment/basal area as an independent variable. The developed model gives a ratio between stand volume increment and basal area (m/year) in relation to the site quality and stand age. The statistics (<I>r</I><sup>2</sup> = 0.819, mean error = 0.019, absolute mean error = 0.033), residual analysis and biological performance were satisfactory. The obtained stand growths varied between 1 and 20 m<sup>3</sup>/ha/year. This simple model allowed to estimate growth values at a stand level from easy field measurements from forest inventories.

scholarly journals Tree health influences diameter growth along site quality, crown class and age gradients in Nothofagus forests of southern Patagonia

2013 ◽  
Vol 59 (No. 8) ◽  
pp. 328-336 ◽  
Author(s):  
H. Attis Beltrán ◽  
G. Martínez Pastur ◽  
H. Ivancich ◽  
M.V. Lencinas ◽  
L.M. Chauchard
Keyword(s):  
Carbon Stocks ◽  
Site Quality ◽  
Tree Age ◽  
Diameter Growth ◽  
Nothofagus Pumilio ◽  
Tree Health ◽  
Qualitative Variable ◽  
Diameter Increment ◽  
Southern Patagonia ◽  
Nothofagus Forests

We examined the influence of tree health on annual diameter increment of trees along gradients in stand site quality, crown classes and tree age in Nothofagus pumilio forests of Southern Patagonia. Healthy trees had higher annual diameter increment than unhealthy trees along all gradients (site quality, crown class, tree age). We argue that tree health could be employed as a qualitative variable in models of tree growth to estimate aboveground biomass and carbon stocks in this forest system. &nbsp;

Coaching, Consultation and On-site Quality Improvement: Results from Recent Research

2011 ◽  
Author(s):  
Nicole Forry ◽  
Kathryn Tout ◽  
Martha Zaslow ◽  
Ivelisse Martinez-Beck
Keyword(s):  
Quality Improvement ◽  
Site Quality

Site Quality, Disturbance, and Vegetation Effects on Carbon Storage and Accumulation in Old, Mixed-Species Stands in Central Maine, USA

2019 ◽  
Vol 39 (4) ◽  
pp. 429 ◽  
Author(s):  
Joshua J. Puhlick ◽  
Shawn Fraver ◽  
Ivan J. Fernandez ◽  
Aaron Teets ◽  
Aaron R. Weiskittel ◽  
...  
Keyword(s):  
Carbon Storage ◽  
Site Quality ◽  
Mixed Species ◽  
Vegetation Effects

Evaluation of Nurse Crops for Weed Control and Plant Establishment in Prairie Restoration

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 485b-485
Author(s):  
Lisa M. Barry ◽  
Michael N. Dana
Keyword(s):  
Plant Biomass ◽  
Spring Barley ◽  
Dry Weight ◽  
Site Quality ◽  
Prairie Restoration ◽  
Plant Establishment ◽  
Significant Difference ◽  
Nurse Crops ◽  
Partridge Pea ◽  
Prairie Plant

Nurse crops are often recommended in prairie restoration planting. This work investigated several alternative nurse crops to determine their utility in prairie planting. Nurse crops were composed of increasing densities (900, 1800, or 2700 seeds/m2) of partridge pea, spring oats, spring barley, Canada wild rye, or equal mixtures of partridge pea and one of the grasses. The experimental design was a randomized complete-block set in two sites with three blocks per site and 48 treatments per block. Each 3 × 3-m plot contained 1 m2 planted in Dec. 1995 or Mar. 1996 with an equal mix of seven prairie species. The nurse crops were sown over each nine square meter area in April 1996. Plots lacking nurse crops served as controls. Evaluated data consisted of weed pressure rankings and weed and prairie plant dry weight. Nurse crop treatments had a significant effect on weed pressure in both sites. Barley (1800 and 2700 seeds/m2) as well as partridge pea + barley (2700 seeds/m2) were most effective at reducing weed pressure. When weed and prairie plant biomass values were compared, a significant difference was observed for site quality and planting season. Prairie plant establishment was significantly greater in the poorly drained, less-fertile site and spring-sown plots in both sites had significantly higher prairie biomass values. Overall, after two seasons, there was no advantage in using nurse crops over the control. Among nurse crop treatments, oats were most effective in reducing weed competition and enhancing prairie plant growth.

Site classification in a mixed hardwood forest (Hallerbos, Belgium) with a homogeneous ground vegetation dominated by Hyacinthoides non-scripta (L.) Chouard ex. Rothm.

1994 ◽  
Vol 59 ◽  
Author(s):  
D. Maddelein ◽  
B. Muys ◽  
J. Neirynck ◽  
G. Sioen
Keyword(s):  
Tree Species ◽  
Ph Value ◽  
Soil Analysis ◽  
Base Cation ◽  
Site Quality ◽  
Ground Vegetation ◽  
Site Classification ◽  
Species Classification ◽  
Tree Species Composition ◽  
Understorey Vegetation

The  forest of Halle (560 ha), situated 20 km south of Brussels is covered by a  beech (Fagus sylvatica)  forest, locally mixed with secundary species (Tilia,  Fraxinus, Acer, Quercus,... ). In almost all  stands, herbal vegetation is dominated by bluebell (Hyacinthoides  non-scripta).     The research intended to classify 36 plots of different tree species  composition according to their site quality. Three classification methods  were compared: the first one based on the indicator value of the understorey  vegetation, a second one on the humus morphology and a last one on some  quantitative soil characteristics. According to the plant sociological site  classification, the plots have the same site quality. However, humus forms  differ apparently and significant differences were found in pH value and base  cation saturation of the soil, abundance and biomass of earthworms and  biomass of the ectorganic horizon. Tree species proved to be the main cause  of these differences.     The results illustrate that the herbal vegetation is not always a reliable  indicator of site quality. In the case of a homogeneous vegetation dominated  by one or more indifferent species, classification on humus morphology or  soil analysis are more appropriate. In the forest of Halle, the tree species  is probably the main cause of the observed differences in site quality.

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