Growth yield and mortality after improved selective logging in tropical rain forest of Sabah Malaysia

Udarbe T.S., . and Falck J., . (2000) Growth yield and mortality after improved selective logging in tropical rain forest of Sabah Malaysia. [Proceedings Paper]

In all commercial usage of the Tropical Rain Forests the harvesting intensity and the technical quality of the harvesting procedure are crucial for sustainable timber production. This study focuses on the response of the residual stand to operational planning and pre-logging treatments. The field study is a comparative experiment using a complete randomised block design where the long term effects of four modes of models of selective harvesting are evaluated - unsupervised logging unsupervised logging with pre-felling climber-cutting pre-marked skid trails and directional felling pre-marked skid trails directional felling and pre-felling climber-cutting and no logging i.e. virgin forest as control. There are four replicates of each treatment which result in a total of 20 permanent plots. Each gross plot is 5.8 ha with a net plot of one ha in the central part climber cutting where alloted was carried out one year ahead of logging and the net plots were enumerated before logging. Logging has been done at full intensity. The entire commercial and accessible volume was logged i.e. all trees of commercial tree species with a diameter above 60 cm were harvested according to the forest law of Sabah. The experiment was established 1992. The plots were logged and enumerated for a second time in 1993 and since then they have been enumerated every second year. For trees above 10 cm dbh enumeration is done on the total area of the net plot. For saplings seedlings and germlings the area invented is reduced. Some preliminary results will be available for presentation at the IUFRO-world congress 2000. The feasibilty of directional felling and pre-felling climber cutting was investigated in a preparatory field study. Professional fellers and local fellers were compared. Impact on accuracy in felling no. of damaged trees in residual stand and gap size was investigated.

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Abstract

In all commercial usage of the Tropical Rain Forests the harvesting intensity and the technical quality of the harvesting procedure are crucial for sustainable timber production. This study focuses on the response of the residual stand to operational planning and pre-logging treatments. The field study is a comparative experiment using a complete randomised block design where the long term effects of four modes of models of selective harvesting are evaluated - unsupervised logging unsupervised logging with pre-felling climber-cutting pre-marked skid trails and directional felling pre-marked skid trails directional felling and pre-felling climber-cutting and no logging i.e. virgin forest as control. There are four replicates of each treatment which result in a total of 20 permanent plots. Each gross plot is 5.8 ha with a net plot of one ha in the central part climber cutting where alloted was carried out one year ahead of logging and the net plots were enumerated before logging. Logging has been done at full intensity. The entire commercial and accessible volume was logged i.e. all trees of commercial tree species with a diameter above 60 cm were harvested according to the forest law of Sabah. The experiment was established 1992. The plots were logged and enumerated for a second time in 1993 and since then they have been enumerated every second year. For trees above 10 cm dbh enumeration is done on the total area of the net plot. For saplings seedlings and germlings the area invented is reduced. Some preliminary results will be available for presentation at the IUFRO-world congress 2000. The feasibilty of directional felling and pre-felling climber cutting was investigated in a preparatory field study. Professional fellers and local fellers were compared. Impact on accuracy in felling no. of damaged trees in residual stand and gap size was investigated.

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Item Type:	Proceedings Paper
Additional Information:	Summary only En
AGROVOC Term:	TROPICAL RAIN FORESTS
AGROVOC Term:	HARVESTING
AGROVOC Term:	GROWTH
AGROVOC Term:	YIELDS
AGROVOC Term:	LOGGING
AGROVOC Term:	EXPERIMENTATION
AGROVOC Term:	SABAH
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16563

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