DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/1971 str. 16     <-- 16 -->        PDF

LITERATURA


Loetsc h F. i Halle r E., 1964: Forest inventory, Vol. I, München.


Loetsc h F., 1968: Zur zukünftigen Entwicklung der Forsteinrichtung unter besonderer
Bericksichtigung der Waldinventur. Forstarchiv, 39, 11—12 str. 237—244.
Loetsc h F., 1969: Grossräumige Waldinventur durch Listenstichproben mit va


riablen Wahrscheinlichkeiten. Forstarchiv, 40, 12, str. 229—239.
Loetsc h F., 1971: Waldinventuren mit Hilfe von Listenstichproben. Forstwissenschaftliches
Centralblatt, 90, 1, str. 3—41.
Sukhatme P. V. i Sukhatme B. V., 1970: Sampling Theory of Surveys with
Applications, Rome str. 1—452.


VOLUME INVENTORY BY MEASURING SAMPLE BASED ON THE VARYING
PROBABILITY BY MEANS OF A LIST WITH MENSURATIONAL INFORMATION
(NEW POSSIBILITIES FOR AN EFFICIENT USE OF AERIAL PHOTOGRAPHS)


Summary


Inventory of forests o larger areas (several managements units) on the basis
of lists with mensurational information collected »a priori« through a rapid preliminary
procedure (by means of yield tables, relascopy, ocular estimate, photo interpretation,
etc., and partly with supplemental exact measurement in the field)
exhibits the following advantages:


a) It yields quick data with sufficient reliability;
b) The method is a »self-weighting one«; larger members (of a stand) have a
greater chance randomly to be determined as a sample element to be exactly


measured in the field than smaller-sized members;
c) The method is free from systematic errors;
d) At selection of members for terrestrial inventory, when stand areas are


determined photogrammetrically, the systematically distributed sample plots
(which sometimes are difficult to be located) do not come into consideration,
but the defined parts of forest or stand which are readily traceable in the
field.


For a rapid volume inventory of exploitable stem populations or an estimate of
their value in the U. S. A. and tropical woods an efficient method is applied with lists
copmosed »a posteriori«. During the same phase an ocular estimate of the volume
(or value) of each individual stem is made, and by random sampling are determined
those stems whose volume will be found by measuring standing trees or after their
felling.