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CERMAK, Z.: Root layering in a tropical forest a er logging (Central Vietnam). Acta univ. agric. et silvic. Mendel. Brun., 2012, LX, No. 1, pp. 23–28 Indigenous stands of tropical rain forests in the region of Kon Ha Nung are one of the most preserved forests in the whole Vietnam. Despite the logging activities mainly in the 1970’s, it was possible to preserve intact forests free from any primary harvesting. In the past, other stands were infl uenced by the logging to various extent. Some of those stands are managed presently; others were le to natural development. This paper deals with the infl uence of harvesting activities on the root system in forest stands. In primary stands and in stands with known harvest intensity, samples of root systems were collected. The total weight of dry basis and mainly their layering within the soil profi le were assessed. The collected roots were divided into three classes: class I – ≤ 1.0 mm, class II 1.1–5.0 mm, class III – over 5.0 mm in the diameter. In the monitored plots, the total weight of dry basis of fi ne roots to 1.0 mm ranged from 2.34–3.24 t·ha−1. The weight of dry basis of roots from 1.0–5.0 mm ranged from 6.57–9.69 t·ha−1. The majority of roots of class I is presented in the top 10.0 cm of the soil and their share drops with the increasing depth. The roots of class II are distributed more equally. It was impossible to prove the infl uence of the logging on the root system. root layering, root mat, tropical rain forest, selective logging Increasing number of papers focuses on the study of tropical rain forest and they deal with the issue from diff erent perspectives. This can be credited both to the general attractiveness of this ecosystem and the easier accessibility of tropical regions and mainly to the society-wide interest in the issues of tropical forest conservation. This relates to the urgent need of fi nding optimal ways of management of natural resources of tropical forest. The traditional protection ideas in sense of conservation of these stands are facing the increasing pressure on the resources due to the growing population in such regions. Considerate forest management of existing forests seems to be the optimal and general applicable approach in sense of the sustainable use of tropical rain forest; this should be followed by strict conservation of the most valuable parts of the stands. Should the forest management be considerate, the impact of the logging activities on the forest stands has to be studied thoroughly. There are several authors researching mainly the change in the tree species and plants diversity and the standing volume all over the tropical region. Our detailed knowledge of tropical rain forest decreases both upwards and downwards from the forest fl oor (Turner, 2001). It is the space under the forest fl oor, mainly the root system that is the focus of this case study. Several authors focus systematically on the issue of roots in the tropical forests such as Pavlis, Jenik (2000); however, this issue does not receive the deserved attention, probably due to the complexity of the fi eld research. The layering of the root biomass and distribution of roots in space are far more complicated in the tropical forests than elsewhere. (Longmann and Jenik, 1974). Tree root systems can be divided into two parts: fi ne and coarse, based on the diameter. Coarse roots are generally woody and provide a mechanical and conductive service to the tree. Water and mineral nutrients are taken up by the fi ne roots that ramify trough the mineral soil and sometimes the litter layer as well (Turner, 2001).

Root layering in a tropical forest after logging (Central Vietnam)