สืบค้นงานวิจัย
ESTIMATION OF WOOD VOLUME BASED ON THE STEM GIRTH IN RUBBER PLANTATION
M. J. Rosyid - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): ESTIMATION OF WOOD VOLUME BASED ON THE STEM GIRTH IN RUBBER PLANTATION
ผู้แต่ง / หัวหน้าโครงการ (EN): M. J. Rosyid
บทคัดย่อ (EN): In Indonesia the number of wood industries which utilize forest timber as the primer material for their product has recently declined. Some forest timber species such as ramin and shorea have even started to disappear from local and/or national market. These situations have lead to the export of ramin and shorea were banned by the Indonesian government. As a result, several wood factories utilizing the two forest timber species have stopped their activities; and this has then lead to decrease in foreign exchange and increase in the number of unemployment. In solving the problems it has been explored any timber species which have similar characteristics to that of ramin and shorea; and Hevea rubber timber proved to have that characteristics. For this reason, rubber timber has therefore nowadays become an alternative to replace forest timber species of ramin and/or shorea. In line with rubber replanting program in Indonesia, the number of rubber timber factory has also increased; and this has promoted to the development of rubber timber market system, where the marketed products included log timber and sawn timber. The problem arising in the market system is that the accuracy of timber volume estimation in the field. The estimate by timber buyers is often inaccurate and this could cause significant economic loss to the buyers. For this reason, a research to find out the simple, quick and accurate method for estimating timber volume in the field, has been carried out in smallholder rubber and the big estates owned by government and private. The method was developed by making a correlation between stem girth and timber volume. The research results revealed that the log volume of clonal rubber trees could be calculated using the formula: Vol10g = 0.000000908 Sg2.9 m3; where Sg is stem girth, standard deviation of the aggregate (SA) is 0.00 and standard deviation of the mean (SM) is 0.19, the limit of accuracy (SA) = <1% and of limit accuracy of the mean (SM) = <10%. Whereas the volume of swan timber of clonal rubber trees could be estimated using the formula: VolST = 0.0000000271 Sg3.5 m3 ; where SA = 0.02 and SM = 6.05. The highest deviation was found on the estimation sawn timber for seedling rubber trees, this was due to the growth and the shape of seedling rubber trees were in big variations. Nevertheless the standard deviation was still low (SA = < 1%), meaning that the formula was still reliable for estimating timber volume in the field. For the log volume of seedling rubber trees could be estimated using the formula Vol10g = 0.000017 Sg2.04 m3 (SA = 0.27 and SM = -102.68). Whereas the sawn timber volume of seedling rubber trees could be calculated using the formula VolST = 0.0000049 Gd2.07 m3 (SA = 0.07 and SM = -141.47)
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): volume estimation.
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

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M. J. Rosyid. "ESTIMATION OF WOOD VOLUME BASED ON THE STEM GIRTH IN RUBBER PLANTATION". ไม่ระบุหน่วยงาน. ม.ป.ป.

M. J. Rosyid. "ESTIMATION OF WOOD VOLUME BASED ON THE STEM GIRTH IN RUBBER PLANTATION". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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ESTIMATION OF WOOD VOLUME BASED ON THE STEM GIRTH IN RUBBER PLANTATION
M. J. Rosyid
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