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.  

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 Potensi Simpanan Karbon pada Tegakan Revegetasi Lahan Pasca Tambang PT Holcim Indonesia Tbk

2020 ◽  
Vol 11 (2) ◽  
pp. 89-95
Author(s):  
Omo Rusdiana ◽  
Syidik Fahmi
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Effect ◽  
Carbon Stock ◽  
Total Carbon ◽  
Site Quality ◽  
Earth’S Atmosphere ◽  
Diameter Increment ◽  
Average Temperature ◽  
Earth's Atmosphere ◽  
Destructive Methods

Global warming is a gradual increase in the average temperature of the Earth’s atmosphere caused by the increased volumes of greenhouse gases such as carbon dioxide, methane, and nitrous oxide. Greenhouse gases is trapped inside the atmosphere and caused UV radiation difficulty passing through Earth’s atmosphere, a processed is often referred to as the greenhouse effect. Reclamation and revegetation activities were expected could decrease the greenhouse effect. The aims of the research is to estimate total carbon stock in Pine Forest age 2005 or 11 years and 2012 or 4 years, and also to compare the result with former research in post mining revegetation site PT Holcim Indonesia Tbk. Biomass measurement of trees, poles, and saplings is conducted with non-destructive methods meanwhile biomass measurements of understorey, litter, and necromassa used destructive methods. The result showed that the value of biomass and carbon stock on the 2005 pine stand is acquired 75.31 tons/ha and 35.39 tons/ha. The value of the biomass and carbon stock on the 2012 pine stand is acquired 12.72 tons/ha and 5.98 ton/ha or increased from the previous year's measurement. Increasing of biomass content and carbon stocks is caused several factors such as increasing of diameter increment dan site quality. Keywords: biomass, carbon, reclamation

Assessment of sugar maple health based on basal area growth pattern

2003 ◽  
Vol 33 (11) ◽  
pp. 2074-2080 ◽  
Author(s):  
Louis Duchesne ◽  
Rock Ouimet ◽  
Claude Morneau
Keyword(s):  
Growth Pattern ◽  
Acer Saccharum ◽  
Radial Growth ◽  
Sugar Maple ◽  
Basal Area ◽  
Tree Age ◽  
Tree Health ◽  
Health Decline ◽  
Area Growth ◽  
Natural Range

The first tree health decline symptoms usually observed are foliar deficiency symptoms, foliage loss, and dieback. To improve the subjective nature and unspecificity of these assessments, we examined sugar maple (Acer saccharum Marsh.) radial growth and health to develop an indicator of sugar maple tree health status based on radial growth pattern. We used the basal area increment (BAI) of 328 tree-ring collections from 16 sites located in southern Quebec, throughout the sugarbush natural range, that were categorized by defoliation class. BAI of trees with decline symptoms was significantly lower than that of healthy trees in 9 of the 16 stands. BAI trends since 1955 showed an inverse relationship with tree decline class measured in 1989, irrespective of tree age. The results indicate that declining trees in these stands have not recovered based on BAI. They also suggest that the decrease in slope of BAI predated the observed symptoms of sugar maple decline by at least one decade. Results suggest that sugar maple vigor and health can be assessed by measuring tree's BAI trend, an indicator that may be useful for the diagnosis of sugar maple health and status years before the appearance of visible canopy symptoms.

scholarly journals Proposals for Nothofagus antarctica diameter growth estimation: simple vs. global models

2014 ◽  
Vol 60 (No. 8) ◽  
pp. 307-317 ◽  
Author(s):  
H. Ivancich ◽  
G.J. Martínez Pastur ◽  
M.V. Lencinas ◽  
J.M. Cellini ◽  
P.L. Peri
Keyword(s):  
Tree Growth ◽  
Growth Models ◽  
Site Quality ◽  
Diameter Growth ◽  
Wide Range ◽  
Nothofagus Antarctica ◽  
Simple Growth ◽  
Simple Equations ◽  
Diameter Growth Models ◽  
Stand Conditions

Tree growth is one of the main variables needed for forest management planning. The use of simple models containing traditional equations to describe tree growth is common. However, equations that incorporate different factors (e.g. site quality of the stands, crown classes of the trees, silvicultural treatments) may improve their accuracy in a wide range of stand conditions. The aim of this work was to compare the accuracy of tree diameter growth models using (i) a family of simple equations adjusted by stand site quality and crown class of trees, and (ii) <br /> a unique global equation including stand and individual tree variables. Samplings were conducted in 136 natural even-aged Nothofagus antarctica (Forster f.) Oersted stands in Southern Patagonia (Argentina) covering age (20&ndash;200 years), <br /> crown class and site quality gradients. The following diameter growth models were fitted: 16 simple equations using two independent variables (age and one equation for each stand site quality or crown class) based on Richards model, plus a unique global equation using three independent variables (age, stand site quality and crown class). Simple equations showed higher variability in their accuracy, explained between 54% and 92% of the data variation. The global model presented similar accuracy like the better equations of the simple growth models. The unification of the simple growth models into a unique global equation did not greatly improve the accuracy of estimations, but positively influenced the biological response of the model. Another advantage of the global equation is the simple use under a wide range of natural stand conditions. The proposed global model allows to explain the tree growth of N. antarctica trees along the natural studied gradients. &nbsp; &nbsp;

Extracting environmentally driven growth trends from diameter increment series based on a multiplicative decomposition model

2011 ◽  
Vol 41 (8) ◽  
pp. 1577-1589 ◽  
Author(s):  
Chaofang Yue ◽  
Ulrich Kohnle ◽  
Marc Hanewinkel ◽  
Joachim Klädtke
Keyword(s):  
Conceptual Framework ◽  
Least Squares ◽  
Environmental Changes ◽  
Nonlinear Least Squares ◽  
Additive Models ◽  
Site Quality ◽  
Multiplicative Decomposition ◽  
Growth Trends ◽  
Diameter Increment

The study developed a conceptual framework for partitioning the components of diameter increment to potentially detect the influence of environmental changes. This process consisted of two steps. First, a multiplicative decomposition diameter increment model was introduced to evaluate the influence of ageing, site quality, competition status, and thinning effects on individual tree growth. Second, generalized additive models were applied to identify the nonlinear dynamic of growth trends caused by environmental changes. The conceptual framework was then applied to Norway spruce ( Picea abies (L.) Karst.) growing in southwest Germany. The database consisted primarily of tree ring series collected from trees cut from long-term experimental stands. Also, stand-level data were available from periodical remeasurements of these plots. The developed analytical technique effectively removed non-environment-related effects (ageing, site quality, and stand dynamic) from the growth signal provided in the diameter increment series. Growth trends deducted from estimates based on either nonlinear least squares, generalized nonlinear least squares, or nonlinear mixed-effects approaches displayed quite similar patterns. In general, the trend in diameter increment showed a long-term increase from the 1920s into the 1990s with a midterm depression in the 1940s that was followed by a significant decrease in the recent past.

Climatic significance of intra-annual bands in the wood of Nothofagus pumilio in southern Patagonia

Trees ◽  
2004 ◽  
Vol 18 (6) ◽  
pp. 696-704 ◽  
Author(s):  
Mariano Masiokas ◽  
Ricardo Villalba
Keyword(s):  
Nothofagus Pumilio ◽  
Southern Patagonia

scholarly journals Variable retention harvesting influences belowground plant-fungal interactions of Nothofagus pumilio seedlings in forests of southern Patagonia

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5008 ◽  
Author(s):  
Rebecca E. Hewitt ◽  
Donald Lee Taylor ◽  
Teresa N. Hollingsworth ◽  
Christopher B. Anderson ◽  
Guillermo Martínez Pastur
Keyword(s):  
Soil Moisture ◽  
Community Composition ◽  
Conservation Status ◽  
Tierra Del Fuego ◽  
Primary Forest ◽  
Nothofagus Pumilio ◽  
Variable Retention ◽  
Seedling Biomass ◽  
Rdna Sequencing ◽  
Southern Patagonia

Background The post-harvest recovery and sustained productivity of Nothofagus pumilio forests in Tierra del Fuego may be affected by the abundance and composition of ectomycorrhizal fungi (EMF). Timber harvesting alters EMF community structure in many managed forests, but the impacts of harvesting can vary with the management strategy. The implementation of variable retention (VR) management can maintain, increase, or decrease the diversity of many species, but the effects of VR on EMF in the forests of southern Patagonia have not been studied, nor has the role of EMF in the regeneration process of these forests. Methods We evaluated the effects of VR management on the EMF community associated with N. pumilio seedlings. We quantified the abundance, composition, and diversity of EMF across aggregate (AR) and dispersed (DR) retention sites within VR managed areas, and compared them to primary forest (PF) unmanaged stands. EMF assemblage and taxonomic identities were determined by ITS-rDNA sequencing of individual root tips sampled from 280 seedlings across three landscape replicates. To better understand seedling performance, we tested the relationships between EMF colonization, EMF taxonomic composition, seedling biomass, and VR treatment. Results The majority of EMF taxa were Basidiomycota belonging to the families Cortinariaceae (n = 29), Inocybaceae (n = 16), and Thelephoraceae (n = 8), which was in agreement with other studies of EMF diversity in Nothofagus forests. EMF richness and colonization was reduced in DR compared to AR and PF. Furthermore, EMF community composition was similar between AR and PF, but differed from the composition in DR. EMF community composition was correlated with seedling biomass and soil moisture. The presence of Peziza depressa was associated with higher seedling biomass and greater soil moisture, while Inocybe fibrillosibrunnea and Cortinarius amoenus were associated with reduced seedling biomass and lower soil moisture. Seedling biomass was more strongly related to retention type than EMF colonization, richness, or composition. Discussion Our results demonstrate reduced EMF attributes and altered composition in VR treatments relative to PF stands, with stronger impacts in DR compared to AR. This suggests that VR has the potential to improve the conservation status of managed stands by supporting native EMF in AR. Our results also demonstrate the complex linkages between retention treatments, fungal community composition, and tree growth at individual and stand scales.

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