scholarly journals Evaluation of regression models for above-ground biomass determination in Amazon rainforest

1994 ◽  
Vol 10 (2) ◽  
pp. 207-218 ◽  
Author(s):  
Johannes Petrus Maria Overman ◽  
Hendrik Johannes Louis Witte ◽  
Juan Guillermo Saldarriaga
Keyword(s):  
Regression Models ◽  
Ground Level ◽  
Dry Weight ◽  
Regression Coefficients ◽  
Above Ground Biomass ◽  
Terra Firme ◽  
Independent Variables ◽  
Ground Biomass ◽  
Random Manner ◽  
Biomass Determination

ABSTRACTIn a mature lowland ‘terra firme’ forest near Araracuara in Colombia, a study was conducted to determine the above-ground biomass by means of regression analysis. Dry weight, DBH (i.e. stem diameter at 1.3 m above ground level, or just above buttresses if these surpassed 1.3 m in height), total height and specific wood density were measured on 54 harvested trees, chosen in a ‘selected random’ manner. Nine different regression models were evaluated for statistical correctness, accuracy of the estimates and for practical use. The logarithmically transformed models with DBH2, and DBH2 × height as independent variables appeared to be the only models meeting the above criteria, the latter being the most accurate.The exclusion of big trees (DBH >45 cm) from the regression did not result in significant changes of the regression coefficients.

Biomass and above-ground productivity of salt-marsh plants in south-eastern Australia

1994 ◽  
Vol 45 (8) ◽  
pp. 1521 ◽  
Author(s):  
PJ Clarke ◽  
CA Jacoby
Keyword(s):  
Salt Marsh ◽  
Perennial Grass ◽  
Temporal Trends ◽  
Dry Weight ◽  
Spatial And Temporal Variation ◽  
Organic Carbon Content ◽  
Above Ground Biomass ◽  
Ground Biomass ◽  
Sporobolus Virginicus ◽  
Eastern Australia

The above-ground biomass of three dominant salt-marsh vascular plants (Juncus kraussii, Sarcocornia quinquejlora and Sporobolus virginicus) was measured to assess both spatial and temporal variation and to provide baseline data. Additionally, the culm dynamics of the rush J. kraussii were measured so that aboveground productivity could be estimated. No distinct seasonal patterns were detected in above-ground biomass in J. kraussii. Averaged over all sites and times, the above-ground biomass of J. kraussii was 1116 g dry weight m-2. Culms are replaced annually, hence standing crop approximated annual above-ground productivity. Much of the dead aboveground biomass appears to accumulate in the upper marsh, as evidenced by the elevated nutrient and organic carbon content of the soil there relative to the sediment in the mangrove zone. Above-ground biomass of the decumbent perennial grass Sporobolus virginicus and the procumbent perennial chenopod Sarcocornia quinqueflora showed no consistent spatial or temporal trends. The above-ground standing crops of these species were about one-third that of J. kraussii.

scholarly journals Estimation of above-ground biomass in forest stands from regression on their basal area and height

2016 ◽  
Vol 64 (1) ◽  
pp. 70-92 ◽  
Author(s):  
Mait Lang ◽  
Ando Lilleleht ◽  
Mathias Neumann ◽  
Karol Bronisz ◽  
Samir G. Rolim ◽  
...  
Keyword(s):  
Regression Models ◽  
Measurement Data ◽  
Basal Area ◽  
Growth Conditions ◽  
Repeated Measurements ◽  
Carbon Accounting ◽  
Published Data ◽  
Above Ground Biomass ◽  
Forest Stands ◽  
Ground Biomass

Abstract A generic regression model for above-ground biomass of forest stands was constructed based on published data (R2 = 0.88, RSE = 32.8 t/ha). The model was used 1) to verify two allometric regression models of trees from Scandinavia applied to repeated measurements of 275 sample plots from database of Estonian Network of Forest Research (FGN) in Estonia, 2) to analyse impact of between-tree competition on biomass, and 3) compare biomass estimates made with different European biomass models applied on standardized forest structures. The model was verified with biomass measurements from hemiboreal and tropical forests. The analysis of two Scandinavian models showed that older allometric regression models may give biased estimates due to changed growth conditions. More biomass can be stored in forest stands where competition between trees is stronger. The tree biomass calculation methods used in different countries have also substantial influence on the estimates at stand-level. A common database of forest biomass measurements from Europe in similar to pan-tropical tree measurement data may be helpful to harmonise carbon accounting methods.

scholarly journals Models for estimating macronutrients in Mimosa scabrella Bentham

CERNE ◽  
2010 ◽  
Vol 16 (3) ◽  
pp. 323-334
Author(s):  
Saulo Jorge Téo ◽  
Sebastião do Amaral Machado ◽  
Afonso Figueiredo Filho ◽  
Carlos Bruno Reissmann
Keyword(s):  
Statistical Models ◽  
Metropolitan Region ◽  
Above Ground Biomass ◽  
Stem Biomass ◽  
Independent Variables ◽  
Macronutrient Content ◽  
Ground Biomass ◽  
The North ◽  
Dominant Height ◽  
Model Independent

The aim of this work was to adjust and test different statistical models for estimating macronutrient content in the above-ground biomass of bracatinga (Mimosa scabrella Bentham). The data were collected from 25 bracatinga trees, all native to the north of the metropolitan region of Curitiba, Paraná state, Brazil. To determine the biomass and macronutrient content, the trees were separated into the compartments leaves, branches < 4 cm, branches > 4 cm, wood and stem barks. Different statistical models were adjusted to estimate N, P, K, Ca and Mg contents in the tree compartments, using dendrometric variables as the model independent variables. Based on the results, the equations developed for estimating macronutrient contents were, in general, satisfactory. The most accurate estimates were obtained for the stem biomass compartments and the sum of the biomass compartments. In some cases, the equations had a better performance when crown and stem dimensions, age and dominant height were included as independent variables.

The effect of wastewater discharge on biomass production and nutrient content of Cyperus papyrus and Miscanthidium violaceum in the Nakivubo wetland, Kampala, Uganda

2003 ◽  
Vol 48 (5) ◽  
pp. 233-240 ◽  
Author(s):  
F. Kansiime ◽  
M. Nalubega ◽  
J.J.A. van Bruggen ◽  
P. Denny
Keyword(s):  
Biomass Production ◽  
Dry Weight ◽  
Nutrient Content ◽  
Flow Patterns ◽  
Above Ground Biomass ◽  
Cyperus Papyrus ◽  
Total Load ◽  
Plant Parts ◽  
Ground Biomass ◽  
Annual Total

The nutrient content of representative plant parts and biomass production in the Nakivubo wetland, correlation of these with the wastewater flow patterns and determination of nutrient uptake, storage and biomass production of Cyperus papyrus (papyrus) and Miscanthidium violaceum was studied. On average papyrus vegetation under the influence of wastewater had higher nutrient content in the above ground biomass (1.6% N and 0.23% P on dry weight basis) than those not affected (0.98% N and 0.18% P). The biomass varied between 3,529-5,844 g/m2 and 883-1,156 g/m2 in the two respective sites. The juvenile plants of papyrus and Miscanthidium had higher concentrations of P and N in their organs compared to the mature ones. Considering the nutrients stored by the dominant vegetation and the current flow patterns of wastewater in the Nakivubo wetland, harvesting of the above ground biomass once a year, would remove 7.7% of the N input and 15.8% of the P input of the annual total load entering the wetland. However, if the wetland is bio-manipulated and the wastewater flow distributed over the whole wetland, up to 70% nitrogen and 76% phosphorus would be removed by harvesting above ground papyrus biomass.

Seasonal changes in biomass and shoot characteristics of a Zostera capricorni Aschers. Dominant meadow in Cairns Harbour, northern Queensland

1994 ◽  
Vol 45 (7) ◽  
pp. 1337 ◽  
Author(s):  
LJ McKenzie
Keyword(s):  
Surface Area ◽  
Seasonal Pattern ◽  
Light Availability ◽  
Environmental Parameters ◽  
Dry Weight ◽  
Spatial And Temporal Variability ◽  
Above Ground Biomass ◽  
Ground Biomass ◽  
Leaf Surface Area ◽  
Below Ground

Spatial and temporal variability of Z. capricorni biomass, shoot characteristics (canopy height, surface area, flowering), distribution and detrital content were examined from December 1988 to December 1990. Between August 1987 and August 1991, 15% (2.0 ha) of the meadow was lost. Biomass of above- and below-ground structures showed a unimodal seasonal pattern with maxima in late spring (mean 194.92 g dry weight m-2 and 426.67 g DW m-2 respectively) and minima in winter (mean 28.72 g DW m-2 and 56.98 g DW m-2 respectively). Mean above-ground biomass (95.53 � 2.21 g DW m-2) was approximately half the mean below-ground biomass (177.28 � 4.49 g DW m-2). Leaf canopy heights were greatest between October and February (maximum 53.4 cm) and lowest around mid year (minimum 4.4 cm). Leaf surface area per square metre of seagrass meadow ranged from 10.28 to 1.39 m2 (mean 3,692 � 0.104 m2), and flowering occurred during September and October. Detrital biomass ranged from 339.73g DW m-2 to 11.83 g DW m-2 (mean 77.39 � 2.36 g DW m-2). Detrital biomass was higher during July-October and lower during February-May. The climate during the study was typical for the area, and all trials displayed similar seasonal patterns, although the amplitudes differed among some trials. The environmental parameters that may influence seagrass and detrital biomass were investigated. The best models explained only 14% of the variation in above-ground biomass, 15% of the variation in below-ground biomass, and 21% of the variation in detrital biomass. These models suggest that fluctuations in seagrass and detrital biomass in Cairns Harbour were influenced by changes in light availability, temperature, salinity and exposure.

Consistent Individuality in the Timing and Magnitude of Flowering by Adenanthos obovatus (Proteaceae)

1998 ◽  
Vol 46 (6) ◽  
pp. 595 ◽  
Author(s):  
R. D. Wooller ◽  
S. J. Wooller
Keyword(s):  
Western Australia ◽  
Ground Level ◽  
Above Ground Biomass ◽  
Ground Biomass ◽  
Flowering Season ◽  
Outcrossing Species ◽  
Rapid Regeneration

The patterns of flowering of 58 individually marked Adenanthos obovatus Labill. plants were recorded from 1983 to 1990 near Perth, Western Australia. Individuals started to flower asynchronously but most then continued to flower until the end of the nine-month flowering season each year. Individuals were highly consistent between years both in the numbers of flowers they produced and in their onset and peak of flowering relative to other members of the population. This consistency was retained after rapid regeneration by 24 plants cut back to ground level during one summer. The number of flowers borne by an individual was not related to its above-ground biomass but to its duration of flowering, and plants bearing more flowers set more seed. These traits may be related to the pollination of this modally outcrossing species by a resident small nectarivorous bird.

Above-Ground Biomass of a Mixed Eucalypt Forest in Eastern Victoria

1979 ◽  
Vol 27 (6) ◽  
pp. 725 ◽  
Author(s):  
HTL Stewart ◽  
DW Flinn ◽  
BC Aeberli
Keyword(s):  
Dry Weight ◽  
Stem Bark ◽  
Above Ground Biomass ◽  
Understorey Vegetation ◽  
Stem Wood ◽  
Ground Biomass ◽  
Eucalypt Forest ◽  
Sclerophyll Forest ◽  
Tree Component ◽  
Branch Wood

Eleven trees of Eucalyptus muellerana and 10 trees both of E. agglomerata and of E. sieberi growing in an uneven-aged mixed sclerophyll forest on duplex granitoid soils in eastern Victoria were felled, measured. separated into branch and stem components, sampled and weighed. Understorey vegetation and litter were also sampled for dry weight determination. Both linear and allometric regressions were developed for each species to predict branch and stem component dry weights from branch and tree dimensions. The predicted component weights for all branches on each tree were summed to estimate crown component dry weights, and regressions were then fitted for these crown component dry weights as functions of tree dimensions. Land area estimates of above-ground tree biomass were made by measuring tree diameters on sample plots. applying the appropriate regressions relating stem and crown component dry weights to tree diameter, and summing the predicted weights for each plot. The above-ground biomass of the forest ecosystem. which had a tree density of 123 stems per ha, was estimated to be 344.100 kg ha-1 of which 94.6% was in the forest overstorey. The proportions of each tree component in the overstorey were stem wood 60.1%, stem bark 15.8%. branch wood 16.5%, branch bark 3.9%, twigs 2.0%, and leaves 1.7%.

Size-biomass relationships for Australian populations of the invasive rangeland shrub Parkinsonia aculeata L.

2002 ◽  
Vol 24 (2) ◽  
pp. 207 ◽  
Author(s):  
A. C. Grice ◽  
S. D. Campbell ◽  
J. R. McKenzie ◽  
L. V. Whiteman ◽  
B. V. Lukitsch
Keyword(s):  
Ground Level ◽  
Dry Weight ◽  
Northern Territory ◽  
Above Ground Biomass ◽  
Cross Sectional ◽  
Site Specific ◽  
Parkinsonia Aculeata ◽  
North Eastern ◽  
Using Data ◽  
Reliable Methods

Parkinsonia aculeata is an invasive, introduced shrub that is found in all mainland states of Australia except Victoria. It is especially prevalent north of the tropic of Capricorn. Size-biomass relationships were established for this species using data from 167 shrubs spread across eight sites in the Northern Territory and north-eastern Queensland. Above-ground dry weight (W, kg) can be predicted from plant height (H, m), canopy diameter (D, m) or stem cross-sectional area (A, cm2) using the equations: W = 0.025 H4.47 W = 0.091 D3.64 W = 0.022 A1.61 These relationships are linear when plotted on log-log scales. Although there was a significant effect of "site" on the log-log relationships between above-ground dry weight and size variables, the amount of information lost by not using site-specific equations is relatively small. These results provide reliable methods for estimating above-ground biomass in this species, the most robust being based on measurements of stem diameter at 20 cm above ground level.

scholarly journals MICRONUTRIENTES DA BIOMASSA AÉREA DE BRACATINGA SOB DIFERENTES CLASSES DE SÍTIO, IDADE E DIÂMETRO

FLORESTA ◽  
2010 ◽  
Vol 40 (4) ◽  
Author(s):  
Saulo Jorge Téo ◽  
Sebastião Do Amaral Machado ◽  
Carlos Bruno Reissmann ◽  
Afonso Figueiredo Filho
Keyword(s):  
Statistical Design ◽  
Dry Weight ◽  
Metropolitan Region ◽  
Above Ground Biomass ◽  
Stem Wood ◽  
Ground Biomass ◽  
Field Samples ◽  
Micronutrient Concentration ◽  
Tree Component ◽  
Diameter Classes

Esta pesquisa teve como objetivo quantificar e analisar as concentrações e conteúdos de micronutrientes da biomassa aérea de bracatinga sob diferentes classes de sítio, idade e diâmetro, na região metropolitana de Curitiba, Estado do Paraná. Foram amostradas 25 árvores em diversas localidades da área de estudo, as quais foram separadas nos seguintes compartimentos da biomassa: folhas, galhos < 4 cm, galhos ≥ 4 cm, madeira e casca do fuste. Após o levantamento de biomassa no campo, amostras foram levadas para o laboratório para a determinação do peso da massa seca e dos micronutrientes. As árvores foram agrupadas por classe de sítio, de idade e de diâmetro, as quais constituíram os tratamentos de um delineamento estatístico inteiramente casualizado. De acordo com os resultados, as concentrações de micronutrientes assumiram a seguinte ordem decrescente: Mn > Fe > Cu > Zn. O compartimento da biomassa aérea que apresentou as maiores quantidades de micronutrientes foi a madeira. As concentrações de micronutrientes não apresentaram tendências claras de aumento ou diminuição com nenhum dos fatores analisados. Somente os diâmetros exerceram efeitos significativos e consistentes sobre os conteúdos de micronutrientes da biomassa aérea de bracatinga na região metropolitana de Curitiba.Palavras-chave: Mimosa scabrella; nutrientes; ciclagem de nutrientes; biomassa. AbstractMicronutrients of above-ground bracatinga biomass under different sites, ages and diameter classes.The aims of this research were to quantify and analyze the micronutrient concentration and content of Mimosa scabrella above-ground biomass under different sites, ages and diameter classes, in Curitiba metropolitan region, Paraná State, Brazil. Twenty five trees were sampled in several localities of the study area, which were separated in different biomass components, as follow: leaves, twigs, branches, stem wood and bark. After the biomass survey in the field, samples of each tree component were carried out to the laboratory for dry weight and micronutrient determination. The trees were grouped by site, age and diameter classes, which constituted the treatments of a completely random statistical design. According to the results, the micronutrient concentrations assumed a decreasing order as follow: Mn > Fe > Cu > Zn. The stem wood presented the highest quantity of micronutrient, considering the tree above-ground biomass. The micronutrient concentrations didn’t present clear tendencies according to site, age and diameter classes. Only the diameter classes had exerted significant and coherent effects on the micronutrient contents of the studied species.Keywords: Mimosa scabrella; nutrients; nutrient cycling; biomass.

scholarly journals An Allometric Model Based Approach For Estimating Biomass In Seven Indian Bamboo Species In Western Himalayan Foothills, India

2021 ◽  
Author(s):  
R. Kaushal ◽  
S. Islam ◽  
Salil Tewari ◽  
J. M.S. Tomar ◽  
S. Thapliyal ◽  
...  
Keyword(s):  
Biomass Production ◽  
Dry Weight ◽  
Allometric Equations ◽  
Bamboo Species ◽  
Above Ground Biomass ◽  
Fresh Weight ◽  
Allometric Model ◽  
Allometric Models ◽  
Ground Biomass ◽  
Himalayan Foothills

Abstract The rapid growth rate, high biomass production, and annual harvesting, makes bamboo as suitable species for commercial production. Allometric equations for many broadleaf and conifer tree species are available. However, knowledge on biomass production and allometric equations of bamboos are limited. This study aims at developing species specific allometric models for predicting biomass and synthetic height values as a proxy variable for seven bamboo species in Himalayan foothills. Two power form based allometric models were used to predict above ground and culm biomass using Diameter at breast height (D) alone and D in combination with culm height (H) as independent variable. This study also extended to establishing H-D allometric model that can be used to generate synthetic H values as proxy to missing H. In the seven bamboo species studied, among three major biomass component (culm, branch and foliage), culm is the most important component with highest share (69.56 to 78.71%).Distribution of percentage (%) share of culm, branch and foliage to above ground fresh weight varies significantly between different bamboo species. D. hamiltonii has highest productivity for above ground biomass components. Ratio of dry to fresh weight of seven bamboo species was estimated for culm, branch, foliage and above ground biomass to convert fresh weight to dry weight.

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