The role of different sources of tree regeneration in the initial stages of natural forest recovery after logging of conifer plantation in a warm-temperate region
2006
Yamagawa, Hiromi | Ito, Satoshi
We analyzed the role of regeneration type (surviving from advanced regeneration, resprouting from advanced regeneration, or newly recruited seedlings) in determining the quantity and quality of individuals in reestablishing a natural forest following clear-cutting of a conifer plantation. We experimentally clear-cut a plantation and undertook a detailed tree census before and after clear-cutting. After clear-cutting, a species composition partially representing warm-temperate evergreen broadleaf forest was present in the form of surviving and resprouted individuals originating from advanced regeneration that had established in the Chamaecyparis obtusa plantation. On the other hand, seedlings that established after clear-cutting were dominated by pioneer species, and the number of seedlings was far greater than the number of individuals originating from advanced regeneration. Our results suggest that the role of regeneration type would differ in relation to the objectives for forest recovery. When any kind of woody cover of the ground surface after clear-cutting would suffice, we suggest that the contribution of pioneer seedlings originating from buried seeds would be important. If the recovery objective is to form a simple evergreen broadleaf forest, such as a coppice woodland, all three sources of regeneration would play a similar role, provided the understory before clear-cutting was as well developed as the one in this study. If rapid establishment of a lucidophyllous forest with diverse species composition is desired, the role of the surviving and resprouting individuals originating from the advanced regeneration would be much more important.
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