Abstract
As the senile phase due and causes depeleting latex productivity, the rubberwood stands can still be claimed as carbon sequestration under the REDD+ Scheme. This is also to maintain vegetation cover in protected forests, beside for fostering social forestry (HKm) sustainability as well. Nowadays the role of genetic and environment factors on latex production have widely revealed by some researchers, but lack on wood production especially for the effect of land elevation and slope exposition against solar beam radiation so need to research. Ordinary Least Square employed at 95% significant level, the respond variable was the volume wood production per tree, whereas the predictor were land elevation in an-100 m above sea level, land slope expositions that were decomposed into 4 categories with the reference of the compass direction in between 3370.30’ to 225.50 follow needle clock’s direction while the three other directions were the westward, southwest ward, and northwest ward. Air humidity and temperature also incorporated to control model error. Data collected by surveying to 75 parcels at HKm area Mangga Joyo located in Way Kanan Regency. Parameter optimization used Minitab 16. The result suggest that wood volume average: (1) increase significantly by 0.02205m3 for every 100m higher elevation, but (2) decrease significantly by 0.21532 m3 which for westward land exposition compare to the eastward one.
Highlights
1.1 Research backgroundGrowth and development of plant are controlled by both genetic and environment factors so does the rubber tree (Hevea brasiliensis)
Both research were employed merely on the rubber seed nursery conditions, that may be give very different effect in case on applying at opened field area with various of environment factors including the terrain of land such as elevation and slope exposition
This group is under the authority of the Bukit Punggur Forest Management Unit (BFMU) which according to [14] lies in parallel of 04° 42' 25.95” - 04° 57' 09.72” S and in meridian of 104° 19' 07.00 ” - 104° 32' 34.00” E. controls the management area of around 45,075 ha consisting of 22796 ha as protected forest and the rest is production forest
Summary
1.1 Research backgroundGrowth and development of plant are controlled by both genetic and environment factors so does the rubber tree (Hevea brasiliensis). Both research were employed merely on the rubber seed nursery conditions, that may be give very different effect in case on applying at opened field area with various of environment factors including the terrain of land such as elevation and slope exposition. In relation to this matter, [10] reported that for every moved up a-100 m across the landscape there would be improvement in bean quality indices of a-1000 weight in one hand but worsen the indices of float bean in water soaking in the other hand. The relationship model of rubber wood production and two variables are very important for some programs of Indonesian Government to reforestation especially for REDD+ Scheme under Paris Agreement regime as [11] and [12]
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