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Huyện Ðoan Hùng, Vietnam

Van Tho N.,Vietnamese Academy of Forest science | Xia N.-H.,Chinese Academy of Sciences | Lam L.V.,Ministry of Science and Technology
Novon | Year: 2014

A new species of Dendrocalamus Nees (Poaceae, Bambusoideae), D. longivaginatus N. H. Xia, V. T. Nguyen and V. L. Le, is illustrated and described from Phu Tho, Vietnam. This species is known only from the northern provinces of Vietnam: Phu Tho, Yen Bai, and Ha Giang. It is morphologically similar to D. brandisii (Munro) Kurz, a widely distributed bamboo from Thailand, Myanmar, China, and Vietnam, but differs by the ligules of the culm sheath, which are irregularly fimbriate, slightly concave, and 7-9 mm, and by the pseudo-spikelets, which are (5-)13-16 mm with lemmas 9-11.5 mm. Source

Nguyen H.N.,Vietnamese Academy of Forest science | Tran V.T.,University of Dalat
Annales Botanici Fennici | Year: 2014

A clambering bamboo from southern Vietnam is described as a new species, Maclurochloa locbacensis N.H. Nguyen & V.T. Tran (Poaceae, Bambusoideae) and illustrated in line drawings. It is similar to M. montana and M. tonkinensis, but differs by having deeply concave culm sheaths and flat stigmas. © Finnish Zoological and Botanical Publishing Board 2014. Source

Kanzaki N.,Japan Forestry and Forest Products Research Institute | Aikawa T.,Tohoku Research Center | Maehara N.,Tohoku Research Center | Thu P.Q.,Vietnamese Academy of Forest science
Nematology | Year: 2016

Bursaphelenchus kesiyae n. sp. is described. The new species was isolated from dead wood of Pinus kesiya during a field survey of nematodes associated with dead pine trees (Pinus spp.). The new species is medium- to large-sized for the genus, with males 690-1059 μm and females 837-1122 μm in body length, and has four lateral lines, six male genital papillae (P1 ventral single papilla is missing or vestigial), a mitten-shaped spicule with clear dorsal and ventral limbs, an indistinctive small and narrow bursal flap, vulva lacking any flap apparatus, and female tail long, tapering and straight or slightly ventrally curved. Based upon its diagnostic morphological characters, the new species belongs to the B. fungivorus group and is closely related to B. thailandae and B. parathailandae, with which it forms a cryptic species complex. However, the new species is distinguished from these two species by the morphology of the male bursal flap and several morphometric values, i.e., the bursal flap of the new species is inconspicuous, or almost lost in many individuals. Molecular phylogenetic analysis inferred from near-full-length SSU and D2-D3 LSU supported the morphological observations, i.e., the new species is molecularly similar to B. thailandae and B. parathailandae, but could be distinguished phylogenetically. Further, differences in molecular sequences in SSU and D2-D3 LSU between the new species and its close relatives are slightly higher than those between B. xylophilus and B. mucronatus, thus, identification of the species status for B. kesiyae n. sp. is considered warranted. © Koninklijke Brill NV, Leiden, 2016. Source

Nguyen V.T.,CAS South China Botanical Garden | Nguyen V.T.,Vietnamese Academy of Forest science | Le V.L.,Ministry of Science and Technology
Annales Botanici Fennici | Year: 2012

Dendrocalamus nianhei V.T. Nguyen & V.L. Le sp. nova (Poaceae: Bambusoideae) is described and illustrated. It resembles D. sinicus, but differs mainly by its shorter pseudospikelets, 12-16 mm long; shorter lemma, 9.7-14.9 mm long; glabrous culm internodes; undulate and bristly culm sheath auricles; and entire leaf sheath ligule. © Finnish Zoological and Botanical Publishing Board 2012. Source

Nambiar E.K.S.,CSIRO | Harwood C.E.,CSIRO | Kien N.D.,Vietnamese Academy of Forest science
Southern Forests | Year: 2015

Vietnam has established 1.1 million ha of acacia plantations for wood production, managed on 5- to 10-year rotation cycles. Nearly 50% of the resource is managed by small growers holding 1–5 ha woodlots. Acacia plantations have emerged as an important resource for supporting the rural economy and national export revenue. Given the range of climate, terrain, soils, management inputs and skills, plantation productivity varies from 10 to 25 m3 ha−1 y−1. Future growth of this sector will depend on improving and sustaining production from the current land base, much of which is already in its second or third rotation. Although studies on sustainable production are limited, available information suggests good prospects for increasing production and improving soils. Breeding has produced genotypes with potential for increasing growth, but this has not generally been matched by sustainable soil and stand management practices. Several current practices warrant immediate change, based on sustainability principles. Internationally, research has established the need for conserving site resources and other judicious management practices. Vietnam should adopt these principles and develop locally appropriate practices to implement them. Greater efforts are required on surveillance of major diseases and tree breeding to improve disease resistance. Because acacia plantations deliver high economic benefits and there are opportunities for improving productivity, an R&D strategy focused on underpinning sustainable management and application would serve the nation well. Key elements include commitments to adaptive research for achieving impacts, effective partnerships between public and private organisations, fostering an integrated approach to management, and special attention to the needs of smallholder growers. © 2015, Copyright © NISC (Pty) Ltd. Source

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