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Key parametres of planting and their statistical analysis

During the field period 2011/2012 we had been put in pawn the trial areas (software) in Tsninsky forest area of the Tambov area. We considered the phytocenose introduced on the trial areas on following components: trees of the central numbers, trees of marginal numbers and a background, napochvennyj a cover.

9 trial areas are in total put in pawn. The minimum age of 6 years, maximum 46. For 6 and 21-year-old biogroups it is put in pawn on 2 trial areas as these of age are defining in the further development of phytocenose.

As is known, the major properties of wood cultures are initial density and housing. Till now the question on density of wood cultures one of central, also is not present a common opinion in this area that is connected with an interlacing of a biological basis and the target importance lesokulturnogo manufactures (Merzlenko, 1992).

Maximum quantity of biogroups (curtains) on 1 hectare 250. From here original density of wood cultures is defined also. The maximum density on 1 hectare of 7200 pieces sejantsev, at quantity of biogroups in 230 pieces/hectares

The general characteristic of the trial areas is introduced in table 7. On a total area, quantity of biogroups, density, a class of a bonitet they are comparable and allow to establish character of age changes (6-46 years) in formation and biogroup development.

Table 7. The characteristic of the trial areas
№ SOFTWARE № quarter № vydela The area, hectares Kol-in biogrupg on 1 hectares, piece Original density on 1 hectares of piece Class

Bonitet

Age, years
1 17 36 1,1 250 6000 I 6
2 2 54 0,9 250 6000 I 6
3 2 44 0,6 230 7200 I 15
4 10 3 10 250 4500 I 21
5 18 22 7,2 230 4600 I 21
6 10 20 8,6 230 4600 I 24
7 27 22 3,6 230 4600 I 39
8 27 1 2,5 230 4600 I 41
9 31 20 6,5 250 6000 I 46



The quantity of biogroups fluctuates from 230 to 250 pieces on 1 hectare.

The maximum density is noted at the age of 15 years and makes 7200 (on 1 hectare). The maximum size of the trial area makes 8,6 hectares and is noted at the age of 24 years, the minimum 1, 6 hectares (age of 6 years).

In table 8 average biometric parametres of trees of the central numbers of biogroups (diameter at breast height, height) which were measured at viable trees of a pine ordinary are introduced.

Table 8. Key parametres of trees of the central number of biogroups

№ SOFTWARE Bsr, sm ^ M Quantity of trees, piece TUM Age,

Years

1 2,5 1,6 42 Se 6
2 2,3 1,6 31 Se 6
3 7,6 8,2 30 С3 15
4 9,6 9,5 32 С3 21
5 12,3 10,9 30 С3 21
6 13,8 12,3 30 С3 24
7 20 20 32 С3 39
8 21,5 21,1 32 С3 41
9 24,7 23 32 С3 46
For 46 years trees of the central number of biogroups reach values


Average diameter of 24,7 sm and heights of trees of 23 m. Otpad comes to the end in the first decade of their growth, and further they are preserved approximately at one level.

In table 9 average statistical parametres of trees of the central numbers are introduced.

Table 9. Average statistical parametres of a forest stand of the central numbers

Biogroups

№ SOFTWARE Bsryosh 5 NsryoSH 5
1 2 3 4 5
1 2,5±0,17 1,15 1,6±0,1 0,58
2 2,3±0,2 0,9 1,6±0,1 0,6
3 7,6±0,62 3,6 8,2±0,45 2,6


Table 9 termination
1 2 3 4 5
4 9,6±0,42 2,4 9,5±0,37 2,1
5 12,3±0,7 4 10,9±0,53 2,9
6 13,8±0,89 4,9 12,3±0,57 3,1
7 20±0,6 3,4 20±0,28 1,6
8 21,5±0,58 3,3 21,1±0,28 1,6
9 24,7±1,1 6,0 23±0,65 3,7


The maximum value of a standard deviation from average magnitude is noted for diameter at the age of 46 years. Hence 70 % of the considered trees are characterised by average diameter in a big way from 18,7 to 30,7 see the Minimum deviation from average magnitude of diameter is characterised 11112 with biogroups at the age of 6 years. The average height as much as possible varies also at the age of 46 years, the minimum deviation is noted for 6-year-old cultures.

On the basis of initial statistical data by us have been calculated factor of a variation which gives representation about competitive mechanisms in biogroup and accuracy of measurements. Settlement data are resulted in table 10.

Table 10. Factor of a variation (variation) of average biometric parametres of trees of the central numbers.

№ SOFTWARE Statistics Bsr Statistics Nsr
CV P CV P
1 46 7 36 6
2 39 9 38 6
3 47 3 32 7,5
4 25 4 22 6,5
5 32 6 27 5
6 35 6 25 6
7 17 3 8 5
8 15 3 7,5 1,8
9 24 4 16 4,9
The variation factor changes on the trial areas (tab. 10). The maximum value of factor of a variation in the diameters have


pjatnadtsatiletnie cultures of a pine ordinary in biogroups, minimum it is noted in 41 year. For heights of trees of the central numbers there is a following distribution: the minimum and maximum value of factor CV is noted accordingly for age in 41 year and 6 years. Value of factors of a variation for the trial areas more low on heights, than in the diameters. Hence - trees of the central numbers are stablest on height, than on diameter.

Factors of accuracy of experience do not exceed here 10 %.

Average statistical parametres of trees of marginal numbers are resulted in table 11.

Table 11. Key parametres of trees of marginal numbers of biogroups

№ SOFTWARE Bsr, sm ^ M Quantity of trees, piece TUM Age, years
1 1,9 1,4 68 Se 6
2 2,2 2,3 53 Se 6
3 8,8 8,3 35 С3 15
4 11,1 10,6 32 С3 21
5 10,7 10,1 41 С3 21
6 11,3 12,1 35 С3 24
7 18,3 19,0 38 С3 39
8 20,6 22,8 32 С3 41
9 26,7 24,5 38 С3 46

The trees growing in marginal numbers of biogroups, reach to 46летнему to age of average diameter in 26,7 sm and heights in 24,5 metres (tab. 11). Quantity of the considered trees the greatest at six-summer age. Further this indicator levels

In table 12 statistical parametres of trees of marginal numbers are resulted.

Table 12. Average statistical parametres of a forest stand of marginal numbers _________________ biogroups _____________________
³pp Bsryosh 5 NsryoSH 5
1 1,9±0,07 0,8 1,4±0,06 0,5
2 2,2±0,1 0,9 2,3±0,1 0,8
3 8,8±0,7 4,1 8,3±0,52 3,1
4 11,1±0,7 4 10,6±0,6 3,4
5 10,7±0,65 4,2 10,1±0,51 3,3
6 11,3±0,47 2,8 11,1±0,32 1,9
7 18,3±0,75 4,6 19,0±0,76 4,7
8 20,6±0,62 3,5 22,8±0,35 2,0
9 26,7±0,98 6,1 24,5±0,64 4,0


For trees of marginal numbers of biogroups it is characteristic: diameter as much as possible varies at the age of 46 years; the maximum deviation of height is noted in 39 years (5 accepts value equal 4,7 on 11117). For diameters and heights the standard deviation accepts the minimum values in six-summer young growths.

In table 13 such statistical parametres as factor of a variation and accuracy of experiences are resulted.

Table 13. Factor of a variation of average biometric parametres

Trees of marginal numbers

№ SOFTWARE Statistics Bsr Statistics Nsr
CV P CV P
1 42 3,6 36 4
2 41 4,5 35 4,3
3 47 8 37 6
4 36 6 32 5,6
5 39 6,1 33 5
6 25 4 17 3
7 25 4,1 25 4
8 17 3 9 2
9 22 3,6 16 3


Unlike the central numbers the variation factor here on heights and diameters differs not so strongly. Minimum value CV for diameters and heights is noted at the age of 41 years, maximum - in 15 years.

Factors of accuracy of experience for a forest husbandry do not exceed 10

%.

On the basis of given tables 10 and 13 schedules of change of factor of a variation for diameters and heights on the trial areas (drawings 4,5) are constructed.

Fluctuation of factors of a variation for diameters and heights is approximately in identical limits. For some age (6,24,46 years) variation factor on diameter above for trees of the central number. For 15 summer cultures, factor СV in the diameters coincides for the central and marginal numbers (fig. 4). Factor of a variation for heights of trees of the central number above on the trial areas 2 and 6 (6 years and 24 years accordingly). Coincidence СV of heights for trees of biogroups of marginal and central numbers is noted also in six-summer young growths (fig. 5).

Thus, the central and marginal numbers of biogroups have the trees differing from average values in the compound. Factors of a variation for the central numbers are stablest on the trial areas.

For cultures of a pine ordinary on numbers about 60 years are elderly change of factor of a variation in limits from 30 to 35 (Hems, 1976) is characteristic.

Fig. 4. Change of factors of a variation of diameters on the trial areas for trees of biogroups,

Growing in central and marginal numbers




Age, years




Fig. 5. Change of factors of a variation of heights on the trial areas for trees of the biogroups growing in

The central and marginal numbers

In biogroups about 15 years factor of a variation more for values of diameters, than for heights are elderly. By 46 years of value of the SOU decrease and do not exceed standard value of the given magnitude. Hence, intensity of an intraspecific competition above at younger age (till 15 years, ПП1-ПП3).

Thus, a basis of formation of considered community are competitive mechanisms which are in more details considered in chapter 3.2.

3.2

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A source: Semyonov Michael Aleksandrovich . Ecological mechanisms for the formation of ecosystem biodiversity in artificial reforestation (on the example of the Tsninsky forest area). 2014

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