Welcome : Welcome Presentation on irregular shelterwood system and the indian irregular shelterwood system. : Presentation on irregular shelterwood system and the indian irregular shelterwood system. Presentation done by,
B.Pragadeeswaran. The irregular shelterwood system. : The irregular shelterwood system. Irregular shelterwoods are defined by timing of regeneration establishment not by spatial arrangement.
Irregular or gradual opening of the canopy ,usually in groups and often followed by the strip fellings.
"Irregular" refers to the subsequent variation in tree heights in the new stand. Regeneration : : Regeneration : Regeneration period is long (i,e) 50 – 60 years.
Crop produced or regenerated is irregular or un even aged.
Type of regeneration is natural. Irregular regeneration and growth of trees: : Irregular regeneration and growth of trees: Uneven aged stand of trees. : Uneven aged stand of trees. Con.., : Con.., The felling regeneration is done in the forms of a portion or a compartments , out of the whole area of woring circle.
Objectives for wildlife, biodiversity, or hydrological green-up may be compatible with this system. Irregular shelterwood system. : Irregular shelterwood system. Indian irregular shelterwood system: : Indian irregular shelterwood system: Definition.
The Indian irregular shelterwood system is defined as a silvicultural system in which the crop to be regenerated is opened up irregularly .
And the resultant crop is also un – even aged. Regeneration. : Regeneration. Regeneration – natural regeneration.
Crop obtained – un – even aged.
interval . – long.
In tropical rain – 3 – 4 years.
forest System. : System. The Indian irregular shelterwood system opening of the canopy is irregular depending on the progress of regeneration.
Immature trees of old crop are retained as part of the future crop. Applications of Indian irregular shelterwood system. : Applications of Indian irregular shelterwood system. In deodar forests of U.P .
Sal forests of U.P.
Tropical rain forest.
Evergreen and semi evergreen forest. Deodar forests of U.P . : Deodar forests of U.P . Removal of all over wood in the form of groups (generally 45- 50 trees per hectare).
Establishment of poles and immature trees.
Thus the canopy is irregular and resultant crop is very often un – even aged. Sal forests of U.P. : Sal forests of U.P. (a).areas which have either regenerated in part of contain some woody regeneration.
(b).areas which are deficient in regeneration but are respond to soil working and seed broad casting.
So, regeneration is irregular . Tending operations. : Tending operations. fencing – regeneration area should be fenced
Shrub cutting – the weeds should be pulled out around the regeneration area.
Removal of diseased trees.
burning Tropical rain forests: : Tropical rain forests: Arunachal pradesh.
All trees above 60 cm diameter of the top canopy are removed in one operation.
The trees of the middle storey are not felled , to controll weed growth.
The regeneration of principle species are tended ,(e.g) Shorea assamica, Dipterocarpus macrocarpus. Con.., : Con.., 1.2 m wide strips are formed and filled by sowing of principle species.
The tending operation are carried out for 3 years.
And the 5th ,7th ,10th years when regeneration in the area gets established. Andamans canopy lifting system: : Andamans canopy lifting system: I.Under this system all saleable trees above a prescribed G.B.H
Hard wood – 150 cm.
Soft woods – 120 cm.
Others – 180 cm.
Are felled in an operation. Slide 20: Felling Poles of non commercial species under growth upto 10 m height.
March – april slighty burning is carried out , usually not carried in the deciduous forests.
During april go for artificial seed broad- casting.
Two or three weeding should be cleared in 1st year.
Climber cutting is done in 2nd year. Con.., : Con.., All unwanted growth is felled in the 3rd year.
Thinning- removal of immature or young ones.
The first thinning is carried out in the 6th year.
Followed by thinning at the ages of 15 , 30 , 50 years. Slide 22: Thank you...