Sanitary state in drained pine stands of the Middle Ural

On the base of 5 permanent quadrates sanitary state of drained serge-cowbrush, ledum, cowbrush-logmoss pine stands of various forest types have been analyzed [1, 2]. It is noted that in all above mentioned forest types for the whole 29 years when they were subjected to the influence of amelioration action accumulation of a considerable amount of dead trees has taken place; their share constitutes 18,9-32,6% out of the whole quantity; the share of the current year do not exceed 4,3-14,4% as concerns their depth. All the above mentioned testifies the worsening of the forest stands sanitary state. As a whole the average-weight index of sanitary state depends on forest type and medium age at the moment of drying, the index is varying from 2,4 (ledum pine stand) to 2,6-3,5 (cowbrush-logmoss pine stand) and 2,5-2,6 (serge-cowbrush pine stand). Our investigations have shown that practically on all the permanent quadrates the most part of «wealthy» and «weakened» category is concentrated in the neighborhood of drying canal (66,0-91,3%)...