Silvicultural Systems of Diffused Regeneration
a) The Selection System:
Silviculture System in which felling and regeneration are distributed over the whole area and the resultant crop so uneven-aged that trees and all ages are found mixed together over every part of the area.
1) Distributed over whole area
2) All age classes are mixed together on every unit and area
3) Regeneration operations are carried out throughout the life of the crop and thinning are done simultaneously for improving the growth and form of trees.
b) The Group Selection System:
Selection system in which trees are felled in small groups and not as scattered single trees of the typical system employed on a part of the whole forest each year under a felling cycle.
Advantages the Group Selection System:
1) Maintains continuous canopy
2) Consumes soil and moisture to the fullest extent possible
3) Most resistant to injuries by insect pests and adverse climatic factors
4) Prevents invitation of grass and weed
5) Natural regeneration comes up without difficulty
6) More growing stock of all ages tress under each-others and
7) Best systems for production of large size trees
8) It produces a forest which is superior biologically, as well in its aesthetic and scenic values.
Disadvantages the Group Selection System:
1) Skill in marking and felling to ensure regeneration to come up in the gaps
2) Cost of logging and extraction is more as mature trees are scattered
3) Inherent quality timber, natural regeneration
4) Grazing problems
5) Protection is difficult to achieve
6) Success or failure of regeneration difficult to assess
7) Growing stock progressively degenerates with every felling by regeneration of less valuable species.