Although we say that trees have feet, I don't think it sounds too good if, for example, you have to mention the number of feet in a forest! 'Standing trees' is the only thing that occurs to me right now.

For the optimum exploitation of commercial forests, it is necessary know the volume of the standing trees as precisely as possible. The problem: some morphologically 'extreme’ trunks aren’t easy to measure using traditional techniques.

http://reflexions.ulg.ac.be/cms/c_366245/en/tropical-forests...

a map showing the location of mature and veteran standing trees and standing and fallen deadwood

https://www.gov.uk/countryside-stewardship-grants/creation-o...

Clearcutting, or clearfelling, is a method of harvesting that removes essentially all the standing trees in a selected area.

https://en.wikipedia.org/wiki/Logging

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Note added at 1 hr (2015-10-24 21:28:40 GMT)
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Relació entre peus de llavors i peus de rebrot:

Nombre de peus arboris centenaris o extrafusters:

http://www.forestal.cat/bdds/imatges_db/ajuts/document_1/AJU...

Els treballs consisteixen en l’estassada de peus arboris i arbustius en zones potencials de pastura, i que havien format part de l'antiga l’estructura d’espais oberts de l’Alta Garrotxa:
Desbrossades del sotabosc
Estassada de peus arbustius
Tala de peus arboris de mida més petita o bé torts o malformats

http://www.ddgi.cat/lportal/web/medi-ambient/noticies/-/asse...

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Note added at 1 hr (2015-10-24 21:32:05 GMT)
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I think it refers to what English-speaking people simply call trees! It doesn't include bushes or suckers.

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Note added at 1 hr (2015-10-24 21:39:29 GMT)
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Neither does it include trees that have 'planted themselves' from seeds: pine nuts, acorns, etc.