MODELING DETRITUS OF DEAD TREES (SNAGS) OF FORESTS OF ALDER UKRAINIAN POLISSYA

Анотація

Presented the results of experimental evaluation of organic matter of dead trees of alder of forests Ukrainian Polissya. Described the morphological characteristics of dead alder (Alnus glutinosa Gaerth.) trees of I-II classes degradation and peculiarities of structure of coarse woody debris I class degradation.

Defined basic density coarse woody debris (snags) of stem I (430 kg(m³)^-1) II (413 kg(m³)^-1) classes destruction and branches dead trees alder of I (438 kg(m³)^-1) and II (419 kg(m³)^-1) classes degradation.

The peculiarities of formation coarse woody debris (snags) of dead trees in the forests of alder. Developed mathematical models for stock assessment coarse woody debris (snags) completely dry dead trees of forests alder in tons per 1 ha and formed standards.

Based on the taxation characteristic of experimental stands and assessment of general coarse woody debris (M_sn, t ∙ ha^-1), including and woody debris class (M_snI, t ∙ha^-1) and class II (M_snII, t ∙ ha^-1) destruction, was formed arrays of experimental data. The analysis of links experimental data, pointed to the close correlation coarse woody debris with age (A, year) (r=0,85), average diameter (D, cm) (r=0,90), average height (H, m) (r=0,90). Also found average connection with a stock of wood in the cortex (M) (r=0,61), a weak correlation with site index (B) (r=0,28) and the relative completeness (P) of stands (r= -0,22).

The features of formation coarse woody debris in alder stands were established . Mathematical models (table) for evaluation stock of coarse woody debris in alder stands in completely dry state in tons per 1 ha.

Tab. Mathematical models of woody debris of alder forests

Number of model

Model

Determination coefficient (R²)

1

М_sn=0,023 · D^0,587 · H ^1,130 · P ^-0,290 

0,86

2

М_sn=0,020 · А^-0,653 · D ^1,182· H^1,450 

0,86

3

М_sn=0,344 · А^-0,169· D ^1,384· B^-0,505 

0,85

4

М_sn=0,319 · D^1,181· B ^-0,479

0,85

5

М_{sn І} =3,24 · 10^-4 · M ^1,444

0,65

6

М_snІІ = 0,017 · A^1,350

0,91

In alder forest mortmass of snags   can vary with age from 0,1 to 7,0 t·hа^-1.