Talk:Basal area

This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Ecology This article is within the scope of the WikiProject Ecology, an effort to create, expand, organize, and improve ecology-related articles.EcologyWikipedia:WikiProject EcologyTemplate:WikiProject EcologyEcology ??? This article has not yet received a rating on the importance scale. Forestry High‑importance This article is within the scope of WikiProject Forestry, a collaborative effort to improve the coverage of the profession and science of forestry on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ForestryWikipedia:WikiProject ForestryTemplate:WikiProject ForestryForestry High This article has been rated as High-importance on the project's importance scale. Plants Low‑importance This article is within the scope of WikiProject Plants, a collaborative effort to improve the coverage of plants and botany on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PlantsWikipedia:WikiProject PlantsTemplate:WikiProject Plantsplant Low This article has been rated as Low-importance on the project's importance scale.

the area of the cross-section of a tree at breast height (about 4.5 feet above ground) usually expressed in square feet. Often used to measure density. Can be used to describe a single tree or the sum of an entire area.

{categorization=ecology}

here are some maths for forestry notes, if someone has time they can use them and add them in here with links:

Volume=〖DBH〗^2*π/4*H*Formfactor +/- 10% Volume= 〖DBH〗^2/1000 +/- 30% DBH = PBH/π Cylinder r = 0 Paraboloid r = 1 Cone r = 2 Neiloid r = 3 g_x=p*x^r Tree Height Geometry Trigonometry b/((a-b))= B/((A-B)) a:b=A:B H=D*(tan⁡〖( α)+tan⁡〖( β))〗 〗 Apparent Height h^'=h_up-h_down

Real Height h=h^'*〖Cos〗^2 (α) Standard Deviation (s, sx, SD) also called quadratic mean and RMS SD=√((X┴- )^2-(X┴- )^2/n)/n Population Standard Deviation (s, sx, SD) SD=√((X┴- )^2-(X┴- )^2/n)/(n-1) IT IS REPORTED WITH THE MEAN AS X┴-±S_X X┴- = arithmetic mean (the mean of the sample) μ = true mean (the mean of the whole population) Standard Error (SE, S_(X┴- )) S_(X┴- )=〖S_X〗_ /√n Confidence Interval CI=n=(SX/(S X┴- ))^(2 )*((C%X)/(C%X┴- ))^2

r_"α" =(r*h)/(Cos α)

FIXED AREA PLOT Blow-up-Factor 〖BF〗_ha=n/〖ha〗_rep = (10 000)/〖Area〗_plot 10 000=1ha So 1 tree in the plot represents 10 000 〖Area〗_plottrees/ha 1m³ within the plot represents 10 000 〖Area〗_plotm³/ha ANGLE COUNT BAF = ((50 * DBH)/R)^2 LEADS TO R=(50*DBH)/√BAF

Basal Area of a Tree is the area of a given section of land that is occupied by the cross-section of tree trunks: BA = DBH²*π/4 (NB for DBH in cm BA=0.0000 7854 *DBH²) result in m² per ha The basal area of a forest stand can be found by adding the basal areas (as calculated above) of all of the trees in an area and dividing by the area of land in which the trees were measured. The plot area big enough for the tree to be counted is A=R²*π So the basal area density is the BAF

BAF[m²〖ha〗^(-1) ]=10 000*ba/A=10 000*(DBH^2*π/4)/((DBH/(W/L))^2*π)=(10 000)/4*(W/L)^2=((50*W)/L)^2 Each tree in ACS represents the same BAF m² per hectare. Represented number of trees

n_rep=BAF/BA=BAF/(DNH²*π/4)

Represented volume V_rep=n_rep*v_tree=BAF/BA*BA*h*ff=BAF*fh — Preceding unsigned comment added by 141.244.80.133 (talk) 18:43, 21 January 2013 (UTC)Reply