# Estimates the wood biomass of logs and truncated branches

### Description

Estimates the wood biomass of logs and truncated branches by computing their volume (using Smalian's formula) and converting it to fresh weight using wood fresh density.

Smalian's formula: *V=\frac{Sb+Sd}{2}l* where *V* is the log volume,
*Sb* is the aerea of the basal (lower) section, *Sd* is the
area of the higher section and *l* is the length of the log.

### Usage

1 | ```
logBiomass(x, lowerD, higherD, logLength, density)
``` |

### Arguments

`x` |
the data frame holding the measures needed to perform the estimation |

`lowerD` |
The name of the data frame column holding diameter of the lower section in cm |

`higherD` |
The name of the data frame column holding the diameter of the higher section (usually smaller!) in cm |

`logLength` |
The name of the data frame column holding the length of the log or branch in m |

`density` |
The name of the data frame column holding the fresh density of the wood, defined as |

### Note

Diameters used to compute section areas should be measured under the bark layer! When this is not the case (scarcely ever!) and diameters include bark thickness the log biomass is somewhat over-estimated!

### References

la Marca, O. *Elementi di dendrometria* 2004, Patron Editore (Bologna), p. 119

### See Also

Other Biomass: `allometryABDC`

,
`allometryAsca2011`

,
`allometryCutini2009`

,
`allometryPorte2002`

,
`powerEquation`

,
`pureQuadraticEquation`

,
`treeBiomass`

, `treeTotalBiomass`