Estimation of above-ground biomass of trees and shrubs in a Eucalyptus populnea F. Muell. woodland by regression of mass on trunk diameter and plant height

1979 ◽  
Vol 27 (2) ◽  
pp. 135 ◽  
Author(s):  
G Harrington
Keyword(s):  
Standard Error ◽  
Correlation Coefficients ◽  
Common Species ◽  
Regression Equations ◽  
Above Ground Biomass ◽  
Trunk Diameter ◽  
Ground Biomass ◽  
Acacia Aneura ◽  
Trees And Shrubs ◽  
Eucalyptus Populnea

An estimate of the above-ground biomass of leaf and wood in the shrubs and trees of Eucalyptus populnea woodland near Cobar, N.S.W., was made, by regression of leaf and wood weight on height or trunk diameter of the most common species. A new double regression technique was used for E. populnea to avoid destructively sampling whole trees. The mass of branches was regressed on primary branch diameter and these equations were used to estimate the total mass of crowns of trees. The estimated crown mass was then regressed on trunk diameters. Regression equations for estimation of mass of wood and leaf are provided for Geijera parvifora, Cassia nemophila, Dodonaea viscosa, Eremophila mitchellii, E. sturtii, E. bowmanii, Myoporum deserti and young Acacia aneura. The error of the estimates varied between 3 and 18% for different species. Log transformation of the data usually improved the correlation coefficients obtained but sometimes increased the standard error of the estimate. Estimates based on canopy measurements were rarely more accurate than those from height or trunk diameter. The overall estimate of biomass was 3.4 t of leaf and 51.4 t of wood per ha with a standard error of < 15%.

scholarly journals Evaluation of the Sensitivity of SMOS L-VOD to Forest Above-Ground Biomass at Global Scale

2020 ◽  
Vol 12 (9) ◽  
pp. 1450
Author(s):  
Arnaud Mialon ◽  
Nemesio J. Rodríguez-Fernández ◽  
Maurizio Santoro ◽  
Sassan Saatchi ◽  
Stéphane Mermoz ◽  
...  
Keyword(s):  
Large Scale ◽  
Correlation Coefficients ◽  
Global Scale ◽  
Above Ground Biomass ◽  
Ground Biomass ◽  
Northern Latitudes ◽  
Ocean Salinity ◽  
Good Proxy ◽  
Using Data ◽  
The Tropics

The present study evaluates the L band Vegetation Optical Depth (L-VOD) derived from the Soil Moisture and Ocean Salinity (SMOS) satellite to monitor Above Ground Biomass (AGB) at a global scale. Although SMOS L-VOD has been shown to be a good proxy for AGB in Africa and Tropics, little is known about this relationship at large scale. In this study, we further examine this relationship at a global scale using the latest AGB maps from Saatchi et al. and GlobBiomass computed using data acquired during the SMOS period. We show that at a global scale the L-VOD from SMOS is well-correlated with the AGB estimates from Saatchi et al. and GlobBiomass with the Pearson’s correlation coefficients (R) of 0.91 and 0.94 respectively. Although AGB estimates in Africa and the Tropics are well-captured by SMOS L-VOD (R > 0.9), the relationship is less straightforward for the dense forests over the northern latitudes (R = 0.32 and 0.69 with Saatchi et al. and GlobBiomass respectively). This paper gives strong evidence in support of the sensitivity of SMOS L-VOD to AGB estimates at a globale scale, providing an interesting alternative and complement to exisiting sensors for monitoring biomass evolution. These findings can further facilitate research on biomass now that SMOS is providing more than 10 years of data.

Do elephants over-utilize mopane woodlands in northern Botswana?

1996 ◽  
Vol 12 (4) ◽  
pp. 505-515 ◽  
Author(s):  
Raphael Ben-Shahar
Keyword(s):  
Biomass Production ◽  
Growth Rates ◽  
Above Ground Biomass ◽  
Current Estimate ◽  
Rainfall Gradient ◽  
Ground Biomass ◽  
Biomass Removal ◽  
Elephant Population ◽  
Trees And Shrubs ◽  
Regional Rainfall

ABSTRACTEvidence from southern African semi-arid savannas suggests that high elephant densities in nature reserves cause the over-utilization of woodlands. Northern Botswana, with its prolific elephant population, is expected to follow such a pattern unless the densities of elephants which could be sustained by indigenous woodlands are determined and maintained at carrying capacity. Above ground biomass production was estimated for mopane (Colophospermum mopane) woodlands, a principal food source for elephants, which grows over much of northern Botswana. Densities of trees and shrubs, dimensions of plants and elephant densities were recorded within stratified plots situated according to a regional rainfall gradient. Mean estimates of above ground biomass (foliage and twigs) were 9.41 and 7.83 t ha−1 for shrubs and trees respectively. A logistic model described the maximum levels of biomass removal from plants before over-utilization of mopane occurred. Variables incorporated in the model included above ground biomass of mopane shrubs and trees, growth rates of plants and expected off-take by elephants. The model predicted a complete biomass regain within 10 y if no elephant browsing occurs. Intensive elephant browsing in woodlands containing 15 elephants km−2, however, can suppress biomass production if growth rates of plants fall below 70% of the maximum annual rate. Nonetheless, there was no substantial evidence to suggest that elephants will reduce the biomass of mopane woodlands in northern Botswana below a sustainable level if their numbers are allowed to increase considerably beyond the current estimate.

scholarly journals Carbon Sequestration of Above-Ground Biomass of Pinus Sylvestris L. in the Green Belt of the City of Astana

2018 ◽  
Vol 60 (3) ◽  
pp. 137-142
Author(s):  
Assel R. Tumenbayeva ◽  
Dani N. Sarsekova ◽  
Stanisław Małek
Keyword(s):  
Chemical Composition ◽  
Pinus Sylvestris ◽  
Carbon Content ◽  
Scots Pine ◽  
Pine Plantations ◽  
Regression Equations ◽  
Above Ground Biomass ◽  
Green Belt ◽  
Ground Biomass ◽  
The City

Abstract The article presents the results of research in the pine plantations located in the green belt of the city of Astana, the dry steppe zone of Northern Kazakhstan, and in the research, the data on biomass and carbon content in various fractions of Scots pine were obtained. Assessment of morphometric parameters of the pine stands was carried out by measuring tree height and trunk diameter at breast height (DBH); to determine the carbon content, laboratory analytical methods were used. Samples were taken from each element of biomass (branches, trunk, leaves, and bark) of Scots pine, in triplicate. After that, the green mass was weighed on the analytical scales to within 0.001 g. The samples were then dried to a constant weight at a temperature of 65°C. In laboratory samples without mineralization, the content of carbon was determined using element analyser. Regression equations were used to calculate the biomass of stocks. To measure the taxation indicators and sampling of plantations, trial plots were laid in triplicate for trial plots, the height of plantations varied on average from 5.8 m to 8.4 m on the plotted trial plots, and the diameter of the trunk varied from 7.7 cm to 8.8 cm. The correlation between plant height and stem diameter was 0.745. As the studies of chemical composition in needles, bark, trunk and branches of pine trees showed, the amount of carbon was from 50.03 to 51.33%. Thus, the study of the chemical composition of the pine plantations showed that the greatest content of chemical elements, such as carbon, was in tree needles. The accumulation plantations of Pinus sylvestris L. in the green belt of the city of Astana were sequestrated 973.3 tons of carbon in the above-ground biomass varied from 2.9 to 4.8 t/ha.

scholarly journals Development of allometric relationships for estimate above ground biomass of trees in the tropical abandoned land

2019 ◽  
Vol 20 (12) ◽  
Author(s):  
Karyati Karyati ◽  
Kusno Yuli Widiati ◽  
Karmini Karmini ◽  
Rachmad Mulyadi
Keyword(s):  
Correlation Coefficients ◽  
Tree Height ◽  
Allometric Equation ◽  
Allometric Relationships ◽  
Above Ground Biomass ◽  
Study Objective ◽  
Land Type ◽  
Ground Biomass ◽  
Abandoned Land ◽  
Abandoned Lands

Abstract. Karyati, Widiati KY, Karmini, Mulyadi R. 2019. Development of allometric relationships for estimate above ground biomass of trees in the tropical abandoned lands. Biodiversitas 20: 3508-3516. The abandoned lands have important role in the ecological function as well as carbon sequestration. The allometric equations to estimate above ground biomass in abandoned land are still limited available. This study objective was to develop allometric relationships between tree size variables (diameter at breast height (DBH) and tree height) and leaf, branch, trunk, and total above ground biomass (TAGB) in abandoned land in East Kalimantan, Indonesia. The correlation coefficients between stem DBH and tree height to leaf and branch indicating a relatively weak relationship. The moderately strong relationships were showed by DBH and tree height to trunk and TAGB. The specific allometric equation of above ground biomass for different land use and land type is needed to estimate the accurate TAGB in the site.

Chemical and botanical composition of the diets of oesophageally fistulated sheep, cattle and goats in a semi-arid Eucalyptus populnea woodland community.

1980 ◽  
Vol 2 (1) ◽  
pp. 94 ◽  
Author(s):  
VR Squires
Keyword(s):  
Diet Quality ◽  
In Vitro Digestibility ◽  
Nutritional Needs ◽  
Low Levels ◽  
Time Of Year ◽  
Acacia Aneura ◽  
Trees And Shrubs ◽  
Herbage Layer ◽  
Eucalyptus Populnea

Diet samples collected from oesophageally fistulated sheep, cattle and goats on six occasions over a 12 month period were analysed for botanical and chemical composition. Angus steers, Merino wethers and feral goats were used in the study which was conducted in a poplar box (Eucalyptus populnea) woodland community near Cobar in northern N.S.W. Over 90 species, including trees and shrubs, were available to the livestock but only 18 species were eaten and of these, only five were of major consequence. These were the grasses, Eragrostis lacunaria and Stipa variabilis and the chenopods, Bassia diacantha, B. convexula and Chenopodium anidiophyllum. Other species to figure prominently in the diet were the composite forbs Calotis spp. and the shrub Acacia aneura. Diet quality was generally low with percent N in the range 0.98-2.10% and in vitro digestibility values ranging from 42-61%. The diet quality varied throughout the year and between animal species at any one time of year. Sheep selected diets which were higher in nitrogen and which were more digestible than those selected by either cattle or goats. Shrubs and trees were a major component of the diets of all three livestock species when the herb layer plants had been reduced to low levels of availability (< 180 kg/ha). Goats ate more trees and shrubs than either sheep or cattle at all times (P < 0.05) and these plants contributed up to 55 per cent of the goat's diet on occasion. The maximum contribution of shrubs to sheep and cattle diets was 22% and 34% respectively. Management implications are discussed in the light of the ephemeral nature of the herbage layer and the nutritional needs of the livestock.

scholarly journals Harmony concept of craniofacial morphology among young Serbian population on Kosovo and Metohia

2021 ◽  
pp. 45-45
Author(s):  
Aleksandrija Djordjevic ◽  
Jasna Pavlovic ◽  
Vladanka Vukicevic ◽  
Amila Vujacic ◽  
Sanja Simic ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Linear Regression ◽  
Standard Error ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Craniofacial Morphology ◽  
Regression Equations ◽  
Aim Analysis ◽  
Individual Values ◽  
The Individual

Background/Aim. Analysis of cephalometric value of profile radiographs are very important for orthodontic diagnosis and planning of therapy. These values differ morphologically in dependence of ethic and racial affiliation. Aim of this study was to confirm variations of cephalometric norms and extent of their value, and according to them confirm the harmony concept of craniofacial morphology among young Serbian population on Kosovo and Metohia. Methods. This retrospective study comprised 183 profile radiograms from Kosovo and Metohia, aged 8-33, from which Class I was ascertained among 82 patients (53 female and 29 male). Five cephalometric angles were measured and analysed. Pearson correlation coefficients was used to define the strength of correlation between the five variables. Bivariable linear regression was used to form harmonious combinations of individual values in insight of craniofacial harmonious form. Multiple regression and standard error were used to form harmonious schema. Results. Linear regression equations were used to define cephalometric floating norms. They have helped us form a harmonious box and harmonious schema of craniofacial norms of the participants. Extent of harmonious value for orthognathic profile varies for SNA 78? - 81?, SNB 75.1? - 78.1?, NL-NSL 11.5? - 5.5?, NSBa 134.7? - 125.8? and ML-NSL 40.5? - 30.6?. Conclusion. Cephalometric floating norms that describe the individual craniofacial pattern among young Serbian population on Kosovo and Metohia, determined and defined of five cephalometric variables, are presented in the form of harmonious box and harmonious schema and can accurately determine the craniofacial pattern.

scholarly journals Development of Prediction Regression Equations for Biomass Estimation in Eucalyptus Forest Plantations in the Punjab State of India

2020 ◽  
Vol 8 (10S2) ◽  
pp. 20-32
Keyword(s):  
Biomass Estimation ◽  
Total Biomass ◽  
Regression Equations ◽  
Above Ground Biomass ◽  
Prediction Equations ◽  
Breast Height ◽  
Ground Biomass ◽  
Eucalyptus Forest ◽  
Below Ground ◽  
Predicted Values

Prediction equations have been worked out on the basis of 17 trees felled for Eucalyptus hybrid for different tree components on the basis of diameter and height (D2 H) which was found to be best suited as depended variable over D & D2 (Diameter at Breast Height 1.37 m). The correlation coefficient (r2 ) values of all the tree components are significant where as these values for AGB (Above Ground Biomass), BGB (Below Ground Biomass) and Total Biomass (TB) is highly significant. These developed prediction equations are validated by comparing the predicted values of total biomass of overall average trees felled with their actual / calculated biomass. The differences of predicted and actual biomass ranged from 6.8 to 38.5 % of different diameter classes in the felled Eucalyptus trees. Generally differences between predicted and actual biomass in percentages of 10 – 30 % is universally acceptable in forest management.

Preferential use of casing (girth) measures for estimating body volume and density

1975 ◽  
Vol 38 (3) ◽  
pp. 560-563 ◽  
Author(s):  
A. Weltman ◽  
V. Katch
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Standard Error ◽  
Correlation Coefficients ◽  
Body Volume ◽  
Regression Equations ◽  
Body Density ◽  
Theoretical Justification ◽  
Total Body ◽  
Total Body Volume

Theoretical justification for the preferential use of casing (circumference) measurements for estimating total body volume (TBV) and body density (Db) was studied in 24 female subjects (mean age 20 yr, mean wt 58 kg). Multiple linear regression equations resulted in R = On-0.99 with a standard error no larger than 1.69 liters for predicting TBV and R = Oa-Oh with a standard error no larger than 0.0084 g/ml for predicting Db. Validations of these regression equations using two additional samples of subjects resulted in validity coefficients of r = 0 –0.99. All the correlation coefficients were statistically significant (P less than 0.01).

scholarly journals Primary and Secondary Igapó Forests in the Peruvian Amazon: Floristics, Physical Structure and the Predictive Value of Soil Bulk Density

2019 ◽  
Vol 8 (1) ◽  
pp. 20
Author(s):  
Randall W. Myster
Keyword(s):  
Species Richness ◽  
Bulk Density ◽  
Basal Area ◽  
Soil Bulk Density ◽  
Common Species ◽  
Physical Structure ◽  
Stem Density ◽  
Above Ground Biomass ◽  
Stem Size ◽  
Ground Biomass

Igap&oacute; forests are a key part of the Amazon.&nbsp; And so, it is important to know their floristics and physical structure, and how they may be influenced by their soil.&nbsp; The floristics and physical structure of 16 primary [1o] and secondary [2o] igap&oacute; forest plots in Loreto Province, Peru was described and linear regressions were computed to explore whether soil bulk density could predict structural parameters. In the 1o forest, Fabaceae, Malvaceae and Rubiaceae were the most common families and Calycophyllum spruceanum, Ceiba samauma, Inga spp., Cedrela odorata, Copaifera reticulata, Phytelephas macrocarpa, Guazuma rosea, and Piptadenia pteroclada were the most common species. And as flooding increased, bulk density, stem density, stem size, species richness, Fishers &alpha;, basal area and above-ground biomass all decreased. In the 2o forest, Urticaceae, Rubiaceae and Euphorbiaceae were the most common families and Cecropia membranacea, Sapium glandulosum, Pourouma guianensis and Byrsonima arthropoda were the most common species. The number of stems was greatest in the island 2o forest and lowest in the 1o forest under water for more than four months, and mean stem size, species richness, Fishers &alpha;, basal area and above-ground biomass was lowest in the sandy beach 2o forest and highest in the 1o forest under water one to two months. Soil bulk density predicted mean stem size, species richness and Fishers &alpha; well, where all three decreased as soils became more sandy. I conclude that as soil becomes less sandy with more clay content there is an increase in forest structural complexity, unpredictable flooding in 2o forests reduces structure more than the predictable flood pulse 1o forests receive, and soil bulk density may have a causal role for diversity in igap&oacute; forests.

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