DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 11-12/1970 str. 60     <-- 60 -->        PDF

SOME CHARACTERISTICS OF THE ORGANIC MATTER OF SOILS
IN NORWAY SPRUCE FORESTS OF CROATIA


Summary


In the natural stands of Norway Spruce in the region of Gorski Kotar and Velebit
were performed investigations concerning the content of organic matter in the
osil of humus group composition, as well as the percentage and total contents of N,
P, K, Ca and Mg in the organic layers of soil (Ao horizont).


The region represents the main part of the Spruce area in Croatia, is distinguished
by a perhumid climate and built up of limestones and dolomites along with
smaller penetrations of compact or redeposited clastic sediments, predominantly
sandstones.


The investigations included all the more significant soils on which Norway Spruce
occurs naturally in Croatia (Tab. 1).
In the article are presented skeleton data on the investigated properties of soil.


Established vas a wide range of amounts of humus in the soil. In soils of the
A-C structure of the profile were established the highest amounts of humus, while
in the soils of the ABC profile structure the lowest ones. The data about the group
composition of humus (Tab. 3) show the greatest differences if grouped according
to the soil types.


Data concerning the percentage amounts of N, P, K, Ca and Mg (Tabs. 4 and 5)
show significant differences with regard to the chemical properties of the soil. A
very great difference was found (Tab. 4) in the content of decomposable phosphorus
in the Ao and Ai soil horizons, which suggests a significant biological accumulation
of phosphorus in Croatia´s Norway Spruce forests.