Báo cáo nghiên cứu khoa học ACACIA PLANTATIONS FOR SAWLOG PRODUCTION: SOME SIVILCULTURAL MEASURES AND RECOMMENDED SUITABLE AND PROFITABLE ACACIA SPECIES

Các nghiên cứu về phản ứng pha loãng để tăng trưởng đường kính, cắt tỉa phản ứng để đăng nhập khuyết tật và ứng phóphốt pho (P) của sự phát triển keo lai ở Quảng Bình và Quảng Trị cho thấy: (1) mỏngphương pháp tăng tốc độ tăng trưởng đường kính của cây keo lai, (2) cắt tỉa giảm các khuyết tật đăng nhập của keolai (3) thụ tinh 10 g phốt pho nguyên tố (như 143 g supe lân / cây) trồngthời gian là đủ để tăng chiều cao phát triển của cây keo lai ở giai đoạn sớm...
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Báo cáo nghiên cứu khoa học " ACACIA PLANTATIONS FOR SAWLOG PRODUCTION: SOME SIVILCULTURAL MEASURES AND RECOMMENDED SUITABLE AND PROFITABLE ACACIA SPECIES "Collaboration for Agriculture and Rural Development (CARD) Program ACACIA PLANTATIONS FOR SAWLOG PRODUCTION: SOME SIVILCULTURAL MEASURES AND RECOMMENDED SUITABLE AND PROFITABLE ACACIA SPECIESProject title: Sustainable and profitable development of acacia plantations for sawlog production in VietnamProject code: CARD 032/05 VIE Phi Hong Hai1*, Chris Harwood2, Chris Beadle2, Sadanandan Nambiar2, KhongsakAuthors: Pinyopusarerk2, Vu Dinh Huong3, Dang Thinh Trieu4, Pham Xuan Dinh5, Trieu Thai Hung5Project Implementing organisations: 1 Research Centre for Forest Tree Improvement - FSIV 2 CSIRO – Sustainable Ecosystems, Private Bag 12, Hobart 7001, Australia 3 Sub-Institute of Forestry Research in the South - FSIV 4 Silvicultural Technical Division - FSIV 5 Center for Forestry Science and production in Northern Central regions - FSIV * Responsible author (phi.hong.hai@fsiv.org.vn)SUMMARYStudies on thinning response to diameter growth, pruning response to log defects and response tophosphorus (P) of acacia hybrid growth in Quang Binh and Quang Tri showed that: (1) thinningmethod increased diameter growth of acacia hybrids; (2) pruning decreased log defects of acaciahybrids; (3) fertilisation of 10 g of elemental phosphorus (as 143 g superphosphate/tree) at plantingtime was sufficient for increasing of height grow of acacia hybrids at early stage in Quang Tri. Insawn timber plantations, Acacia mangium, A. auriculiformis, A. crassicarpa and Acacia hybrids (A.mangium x A. auriculiformis) were proved to be suitable species. A. crassicrapa was a promisingspecies and performed well in inland sands in the central Vietnam. A. mangium was a suitable speciesin lowland in the northern Vietnam. While, A. auriculiformis was preferred planting in the southernVietnam. Acacia hybrids could be planted in many sites from the North to the South. National clones,and technological advanced clones that approved by Ministry of Agriculture and Rural Developmentwere suggested for using in commercial plantations of A. auriculiformis and acacia hybrids. For A.mangium and A. crassicarpa, seed sources from seed production areas and seed orchards wererecommended to use. compesating source for this deficit. To meet1. Introduction the demand of industrial wood and to increase forest coverage to 43%, the reforestationNeeds on timber for processing industry in program has planned to plant 5 millionVietnam in 2010 is expected to be 9.35 million hectares of forest by 2010. Among them, morem3 (MARD, 1999). But now the natural than 2 million hectares are production forests,forests are limited for exploitation, so the this source can provide industrial wood.annual timber volume from this kind of timber Increasing forest productivity throughsources will only provide less than 300,000 m3 improved seeds and silvicultural techniquesper year (MARD, 1999). Timber from will play a crucial role to meet the demand forplantation forest and imports is expected as the 186 CARD 032/05 – Acacia planation for sawlog productiontimber and and to reduce the volume of 2. Research materials and methodsimported wood. 2.1 Thinning and pruning trialAcacia species have been imported intoVietnam since middle of 20th Century, mainly A mixed plantation forest of hybrid acaciafrom Papua New Guinea (PNG) and clones of 2.5 years old in Dong Hoi - QuangQueensland, Australia (Nguyen Hoang Nghia, Binh has been selected for thinning trial.2003). In Vietnam, in 2005, the total area of Plantation model was built in December 2003,acacia plantation reached 400,000 hectares, with a mixture of the hybrid Acacia clonesincluding 200,000 hectares of acacia hybrid BV10, BV16 and BV32. The trees in this(Ha Huy Thinh, 2005). Productivity and model are remarkably of good growth andsustainability of plantation of Acacia species good form. The plantation is well stockedare crucial to improving the countrys (1000 trees/ha), healthy, average height ofeconomy, the development of rural areas, and trees reached 8 meters, and crown lift isthe creation of pulp and sawlog. minimal. With this growth rate, it is predicted that forest productivity is 20m3/ha/year for aThe CARD project 032/05 VIE titled pulp production rotation. For all these reasons,“Sustainable and profitable development of this plantation already meets the criteria thatacacia plantations for sawlog production in define an ideal site for managing an AcaciaVietnam was implemented from 2006-2009 stand for solid wood.by a research collaboration between theForestry Science Institute of Vietnam and theCSIRO, funded by the Coll ...