DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-4/1967 str. 39 <-- 39 --> PDF |
height increment of these tree species (Tabs. 2—6, and Graphs 1—2). The results relate to the plantings of Scots Pine and Eastern White Pine on the acid brown soil on relict »terra rossa« (plots 1 and II), and to the planting of Scots Pine on the brown illimerized soil on a calcareous dolomite parent rock (plot IV). On the basis of investigations performed so far the author came to the following conclusions: The acid brown soil on relict »terra rossa« in relation to the brown illimerized soil on calcareous dolomite parent rock possessed in the 0—45 cm. layer considerably higher reserves of the total moisture during the whole period of measurement (except the month of August). If we take into consideration the quantities of the total moisture content for the whole depth of the soil (Tab. 2), then the moisture content in the acid brown soil on relict »terra rossa« is 2—2.5 times greater. The established differences in the content of moisture in the soil did not reflect on the height increment of Scots Pine in the mentioned period of observation. This is explained by the fact that also in the brown illimerized soil during the almost entire period of measurement the moisture content was about 2/3 or more of the water- retaining capacity in that extremely humid year (Tab. 1). Under the mentioned conditions it was established that practically the whole height increment of Scots Pine falls into the period from April 15th to June 15th, the most intensive growth occurring in the month of May. Eastern White Pine grows intensively up to July 15th achieving maximum growth rate between May 15th and June 15th. The pattern of the concentration of mineral nutrients in the needles of both Scots Pine and Eastern White Pine is very similar in respect of both the investigated tree species and the various different soil types (Tabs. 4—6, and Graph 2). |