DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 8-9/1959 str. 25 <-- 25 --> PDF |
ADVANCE GROWTH AND THE TENDING OF STANDS The queistion of the harmfulness or usefulness of advance growth in young stands is stll not enough discussed. In practice, namely, the advance growth is often considered harmfull in general. Discussing this subject we have in view predominantly Beech stands as the most important by us. The advance growth comes into being in many ways, it is of different structure and plays various roles in the stands, and is in connection also with the establishment of a young stand during the carrying-out of seeding cutting whose method has a strong influence on a varied development of the new stand. The advance growth which springs up in the course of performing the seeding cutting usaully cannot be considered harmfull because i t is not dangerous for the development of the thereafter densely seeded young growth. Moreover, this advance growth, especially the one descended from the first seed crop — and if this was poor and the later ones more abundant — it only can bez useful in a dense young stand. Such ah advance growth usnally will not be able to develop a wide-spreading crown because it is followed in its development by a dense new growth from the later seed crops. A part of this advance growth will be utilized in general after the cleanings viz. in thinnings, while a part of it will remain in some places to be cut as a valuable main product in the final felling. Other kinds of advance growth like the stunted advance growth which developed already in the old stand, furthermore stump sprouts, and softwood species if not harmful already in the seed felling they surely will become so by and by. ´Nevertheless their role also may often continue to be useful for a longer, time. In a dense and uniform new growth of Beech developed from a full mast the advance growth exercise an influence on this new stand so that it develops unumiformly, thus creating a heterogeneous structure of the new stand, which is more natural and consequently more suitable for an advantageous development. As regards the fast growing softwood species as advance growth offering a poor shading the better stems will bez partly maintained up to the age when they will yield a valuable intermediate yields, while the mentioned stunted advance growth will be utilized in general in the course of cleanings taking into account that it has nearly finished its useful role in suppressing a part of dense new growth, or if turned to be harmful to the further development of the stand. The method discussed aims to achieve as heterogeneons structure of a stand as passible, and to create a manystoreyed stand. According to the contemporary tending measures as well as to the methods after which the stands are finalljy exploited this heterogeneity represents something essential. This rules also for the young stands, for through the heterogeneity of their structure one makes possible their more successful tending, more favourable development by suppressing a part of the over-dense and thus harmfull part of homogeneous new growth. A dense young growth without an advance growth is always under compression, can hardly develop in a favourable manner without an expensive intervention of manpower. In such a young growth of even structure one achieves late the intermediate yields which are poor, while a heterogeneous advance growth early produces considerable yields thus ensuring the young growth a more favourable development. From what has been mentioned follows, that there comes no general danger from the advance growth, but, on the contrary, a considerable portion of it can be very useful in the different stages of the stand development. (Primljeno za štampu VI. 1959.) |