林业科学与实践(英文版)
论文题目：Discrimination of Acacia seeds at species and subspecies levels using an image analyzer
全部作者： V. SIVAKUMAR1, R. ANANDALAKSHMI1, Rekha R. WARRIER1, B. G. SINGH1, M. TIGABU2, B. NAGARAJAN1
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：Seeds of Acacia species and subspecies were characterized using an image analyzer and discriminated for the purpose of identification of species using their seeds. The species considered in the study were Acacia nilotica subsp. indica, A. nilotica subsp. cupressiformis, A. nilotica subsp....[查看全部]
论文摘要：Seeds of Acacia species and subspecies were characterized using an image analyzer and discriminated for the purpose of identification of species using their seeds. The species considered in the study were Acacia nilotica subsp. indica, A. nilotica subsp. cupressiformis, A. nilotica subsp. tomentca, A. tortilis subsp. raddiana, A tortilis subsp. spirocarpa, A. raddiana, A. senegal, A. auriculiformis, A. famesiana, A. leucophloea, A. meamsii, A. melanoxylon, A. planifrons and A. mangium. Eigh samples each consisting of 25 seeds per species were studied using the image analyzer for physical characteristics of seeds, such as 2D surface area, length, width, perimeter, roundness, aspect ratio and fullness ratio. Discriminant analysis showed that acacias can be discriminated at species and subspecies levels, with 96% accuracy. Exceptions were A. nilotica subsp. tomentosa (75.0%), A. tortilis subsp. spircarpa (75.0%) and A. raddiana (87.5%) which had relatively low discrimination accuracy. Howrver, discriminant analsis within selected species showed complete recognition of these species except for A. tortilis subsp spirocarpa, that had still a large overlap with A. leucophloes. The study also revealed that both seed size and shape characteristics were responsible for species discrimination. It can be concluded that rapid analysis of seed size and shape characteristics using image analysis techniques can be used as primary and secondary keys for identification of acacias.[返回]
下载频数：57 上传时间：2014-02-27
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论文题目：Effect of abiotic factors on understory community structures in moist deciduous forests of northern India
全部作者： Ashish K. MISHRA1,2, Soumit K. BEHERA1, Kripal SINGH3, R. M. MISHRA2, L. B. CHAUDHARY1, Bajrang SINGH3
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：Understory vegetation controls, in a significant way, the regeneration of overstory trees, carbon sequestration and nutrient retention in tropical forests. Development and organization of understory vegetation depend on climate, edaphic and biotic factors factors which are not well correlated...[查看全部]
论文摘要：Understory vegetation controls, in a significant way, the regeneration of overstory trees, carbon sequestration and nutrient retention in tropical forests. Development and organization of understory vegetation depend on climate, edaphic and biotic factors factors which are not well correlated with plant community structured. This study aimed to explore the relationships between understory vegetation and abiotc factors in natural and planted forest ecosystems. A non-metric multidimensional scaling (NMS) ordination techniqu was applied to represent forest understory vegetation among tive torest communies, i. e., a dry miscellaneous forest (DMF), a sal mixed forest (SMF), a teak plantation(IP), a low-land niscellaneous forest (LMF) and a savanna area (SAV) of the Katerniaghat Wildlife Sanctuary, located in northern lndia. Microclimatic variables, such as photosynthetically active radiation (PAR), air temperature (AT), soil temperature (ST), ambient atmospheric CO2 concentration, absolute air humidity (AH), physical and chemical soil properties as well as biological properties were measured. Understory species were assessed via 100 random quadrats(5mX5m) in each of the five forests in which a total of 75 species were recorded encompassing 67 genera from37 families, consisting of 32 shrubs and 43 plant saplings. DMF was the most dense forest with 34,068 un derstory individuals per ha of different species, whereas the lowest understory population (13,900 per ha) was observed in the savanna. Ordination and correlation revealed that microclimate factors are most important in their effect compared to edaphic factors, on the development of understory vegetation in the various forest communities in the north of india.[返回]
下载频数：75 上传时间：2014-02-27
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论文题目：Functional relationships of nodulation response and biomass production at nursery stages of two fast-growing, leguminous- multipurpose tree species in Bangladesh: Albizia saman and Leucaena leucocephala
全部作者： Md. Salim AZAD1,2, Samir MONDOL1, Md. Abdul MATIN1
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：This study was carried out to assess the relationship of the status of nodulation (i. e., number of nodules, their shape and size) in root and biomass production of plant growth parameters (i. e., number of leaves, root and shoot lengths, root biomass and shoot biomass) in Albizia saman and...[查看全部]
论文摘要：This study was carried out to assess the relationship of the status of nodulation (i. e., number of nodules, their shape and size) in root and biomass production of plant growth parameters (i. e., number of leaves, root and shoot lengths, root biomass and shoot biomass) in Albizia saman and Leucaena leucocephala. The assessment started 60 day after seeding. The study revealed that nodulation response and biomass production in both species showed significant differences over time (p<0.05) in all variables except in the root-shoot ratio (oven-dry) of L. lecocephala. The study also showed significant differences (p<0.05) in nodule formation and biomass production at the end of the study period between the two species except in the number of nodules and leaves and leaves and the green root shoot ratio. There were strong positive correlation between nodule formation and biomass production, i.e., the number of nodules and the age of plants, the number of nodules and nodules and leaves, as well as the number of nodules and biomass (root biomass and shoot biomass) in both species. The results obtained using principal component analysis (PCA) and corralation coefficients of the different characteristics of nodunation and biomass production were similar in both species. The PCA showed that shoot biomass(shoot green weigh and shoot oven-weight) is positively correlated with PC1 (with an eigen value of 7.50) and root length is positively correlated with PC2 (with an eigenvalue of 0.19) in the A. saman. In the case of L. leucocephala, the PCA revealed that root biomass (root green weight and root oven-dry weight), shoot biomass and shoot length are also positively correlated with PC1, while nodule formation and the number of leaves are positively correlated with PC2(with an eigenvalue PC1 of 6,92 and PC2 of 0.49).[返回]
下载频数：24 上传时间：2014-02-27
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论文题目：Germination characteristics and diversity of soil seed banks and above-ground vegetation in disturbed and undisturbed oak forests
全部作者： Mehdi HEYDARI1, Hassan POURBABAEI2, Omid ESMAELZADE3, David POTHIER4, Ali SALEHI5
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：THe destruction of natural ecosystems is an important issue in many parts of the world. In the west of lran, a vast area of the Zagros Mountain range is covered by typical vegetation including several rare plant species, of which many are currently considered endangered by anthropogenic...[查看全部]
论文摘要：THe destruction of natural ecosystems is an important issue in many parts of the world. In the west of lran, a vast area of the Zagros Mountain range is covered by typical vegetation including several rare plant species, of which many are currently considered endangered by anthropogenic activities. Despite the important role of soil seed banks to help conserve these degraded plant communities, the floristic studies in the Zagros forests have only focused on aboveground vegetation. In this study, the characteristics of soil seed banks and above-ground vegetation were examined at two forest sites an undisturbed control (Un) and a disturbed (D) site. The objectives of this study were 1) to investigate the diversity of above-ground vegetation and soil seed banks in disturbed and undisturbed forests, 2) to examine the soil propertied and the germination characteristics of the soil seed bank in disturbed and undisturbed oak forests and3) to estimate the potential of soil seed banks in the restoration of disturbed sites. The results show that soil properties between Un and D sites were siginficantly different with higher values of pH, NH4-N, Ntot, CEC, OC, clay and canopy percentage in the Un site than ij the D site. The Simpson diversity, Margalef richness and evenness indices differed significantly between sites, either for the soil seed banks or the above-ground vegetation. After a period of 26 weeks, the germination speed and the mean daily number of germinants were significantly different between Un and D sites. Without other conservation measures, soil seed banks alone cannot result in a full recovery after severe disturbances in the oak forests of Zagros.[返回]
下载频数：27 上传时间：2014-02-27
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论文题目：Effect of pine wood nematode invasion on pine community functions in the Pinghu region, Zhejiang Province, eastern China
全部作者： Zhuang WANG1, Yan ZHANG1, Juan SHI1, You-Qing LUO1, Li-Li REN1, Yu-Ming SHI2
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：In order to inestigate the effect of invastion by pine wood nematode ( PWN), this study analyzed several functional indices, i. e., the increment in DBH and stand volume and biomass, in the damaged stands with various mixed percentages of Pinus massoniana and P. thunbergil and with different...[查看全部]
下载频数：20 上传时间：2014-02-27
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论文题目：Gypsum-bonded particleboard manufactured from agricultural based material
全部作者： Morteza NAZERIAN, Meisam KAMYAB
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：Gypsum-bonded particleboard (GBPB) panels were made from various mixtures of particles of bagasse(Saccharum officinarum L.) and wheat straw (Triticum aestivum L.), bonded with different ratios of particle/gypsum. I'his study examined the feasibility of bagasse and wheat straw particles in the...[查看全部]
论文摘要：Gypsum-bonded particleboard (GBPB) panels were made from various mixtures of particles of bagasse(Saccharum officinarum L.) and wheat straw (Triticum aestivum L.), bonded with different ratios of particle/gypsum. I'his study examined the feasibility of bagasse and wheat straw particles in the production of GBPB. One-layer experimental GBPBs with a density of 1.05 or 1.20 g・cm-3 were manufactured at different ratios of bagasse/wheat straw, i.e., 100%/0%, 93.75%/6.25%, 87.5%/12.5%, 75%/25%, 50%/50%, 25%/75% and 0%/100% using two particle/ gypsum composite ratios, i.e., 1/2.75 and 1/3.25 by weight. Thickness swelling (TS), water absorption (WA), modulus of rupture (MOR), modulus of elasticity (MOE) and internal bond strength (IB) properties of the boards were evaluated and a statistical analysis was performed in order to examine the possible feasibility of these agricultural residues for use in commercial GBPB manufacturing. We determined that WA of panels decreases as the amount of straw increases to100% and the LR/G (wood/gypsum) ratio decreases to 1/3.25, whereas the TS of panels decreases as the proportion of straw decreases to 0% and the LR/G ratio increases to 1/2.75. The experimental results also show that the MOR and MOE of panels containing 0%, 6.25% and 12.5% wheat straw with a LR/G ratio of 1/2.75 were higher than those of oanels made from 25%-100% wheat straw with a LR/G ratio of 1/2.75, as well as those from all other percentages of straw with a LR/G ratio of 1/3.25. [返回]
下载频数：109 上传时间：2014-02-27
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论文题目：Developing phase of China's system of nature reserves in perspective
全部作者： Xue-Jun OUYANG1, Wan-Hui YE1, Marc HOCKINGS2, Chung-Lim LUK3, Zhong-Liang HUANG1
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：Up until 2009, 2541 nature reserves had been established in China. However, the process of developing this system of nature reserves was not quite smooth. Various kinds of information related to nature reserves, such as annual growth, the type of nature reserves established, motives behind...[查看全部]
论文摘要：Up until 2009, 2541 nature reserves had been established in China. However, the process of developing this system of nature reserves was not quite smooth. Various kinds of information related to nature reserves, such as annual growth, the type of nature reserves established, motives behind building a nature reserve, legal instructions and the constitution of government sectors, were collected and analyzed in order to highlight the characteristics of the development of our nature reserve system. As a result, we identify three phases and their characteristics, i.e,, the initial phase from 1956 to 1978, the establishment phase from 1979 to 1996 and the management standardization phase from 1997 to 2009, could be clearly identified. It is suggested that since the establishment of this comprehensive structural framework in China, the system should be entering a new developing phase. We recommend that more attentions should be paid on how to guarantee effective management and how nature reserves are able to maintain their value and fulfill their objectives in the future.[返回]
下载频数：9 上传时间：2014-02-27
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论文题目：Estimating the costs of one hectare of poplar planting and supplying wood required for producing various types of paper in Iran
全部作者： Majid AZIZi
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：In Iran, cue to abundant restrictions on harvesting wood from northern forests by implementing the preservation project and also lack of possibility for sufficient wood production, development of the area of planting poplar is quite inevitable. Poplar wood properties have special importance to...[查看全部]
论文摘要：In Iran, cue to abundant restrictions on harvesting wood from northern forests by implementing the preservation project and also lack of possibility for sufficient wood production, development of the area of planting poplar is quite inevitable. Poplar wood properties have special importance to produce many wood production, particularly pulp and paper. Paper factories are the major consumers of poplar wood at the global level and this is because of unique morphological, physical, mechanical and technological properties of poplar wood. Therefore, regarding the importance of using this species in making various printing and writing paper, packaging or carton, cardboard and newsprint, in this study, costs of poplar production in one hectare including planting and harvesting were examined and determined. Then, based on conversion coefficients of FAO, required round wood, productivity and the cost of poplar wood were calculated for the producing various kinds of paper. The results indicate that carton and cardboard paper or packaging allocate the lowest cost and highest return, while printing and writing paper had highest cost and lowest return in terms of poplar wood supply needed for paper production.[返回]
下载频数：26 上传时间：2014-02-27
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论文题目：The role of forests and forest products in poverty reduction in sub-Saharan Africa in the 21st century
全部作者： J. A. SOAGA, V. O. KOLADE
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：This study bdefly examines the role of forest in poverty reduction in sub-Saharan Africa in the 21st century despite the effect of deforestation and degradation. This sub region is rated as the second region with the highest proportion of poor people globally, i.e., 325 million people. Income in...[查看全部]
论文摘要：This study bdefly examines the role of forest in poverty reduction in sub-Saharan Africa in the 21st century despite the effect of deforestation and degradation. This sub region is rated as the second region with the highest proportion of poor people globally, i.e., 325 million people. Income in the sub region has fallen below the World Bank poverty line of $1.25 per day for developing countries. In fact 45% of the population live on less than $1 per day, with two thirds of the population living in rural areas and small-holder farmers accounting for 80% of the poor. Although about1.6 billion people live on $1-2 per day, signifying improvement in living standards, it is incomparable to income levels in developed countries. The region is therefore characterized by hunger and starvation, diseases, illnesses and under development. In the sub region, the Gini coefficient is 0.44, indicating a high incidence of poverty. Countries worst hit by absolute poverty in the sub region are Nigeria, Mali and the Central African Republic. Consequently, there is an urgent need to improve the welfare of the population of this sub region through available natural resources, such as forests, where modern technology also still tags far behind. It is therefore recommended that forest policy in the sub region be focused on forestry initiatives that will encourage access to forest resources and in turn increase the well-being of the poor through the natural bounty of the goods and services from the forest. Furthermore, forest food consumption must be encouraged among the rural poor through appropriate agroforestry practices, along with enhanced literacy, as well as education for processing and marketing of forest products n regional markets.[返回]
下载频数：14 上传时间：2014-02-27
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论文题目：Quantitative study of poplar plantations in three Iranian provinces
全部作者： Majid AZIZI1, Mohammad Mehdi FAEZIPOUR1, Ali BAYATKASHKOOLI2, Fatemeh TAHERI1
期刊名称：林业科学与实践(英文版) 2013年第4期
论文摘要：Fast growing poplar species enjoy a highly favored position in Iran's forest product industries. However, information on poplar plantations, such as areas, growing stock and harvest volumes, are largely obtained by non scientific means and poorly executed methods. A few studies have been...[查看全部]
论文摘要：Fast growing poplar species enjoy a highly favored position in Iran's forest product industries. However, information on poplar plantations, such as areas, growing stock and harvest volumes, are largely obtained by non scientific means and poorly executed methods. A few studies have been conducted to obtain data on the capacity of poplar plantations, their extent, existing growing stock, distribution and species choice in three provinces, i.e., Western Azerbaijan, Kurdistan and Hamedan, with relatively well developed management systems. We opted for a cluster method, a standard sampling method for conducting similar investigations, consisting of two phases. In the first phase we collected library information and conducted half-open interviews with villagers. In the second phase field measurements in the villages of these three provinces were carried out. Information from field measurements on growing stock, cultivated areas, dominant species were used to estimate volumes by way of volume and weight tables. Results obtained from the present study indicate that the average annual volume of timber harvested in the three provinces was 697,723 m3, with an average sampling error of 22.7 per cent. This annual volume of poplar timber harvested from the three provinces was estimated to amount to about 25 per cent of overall harvest; at that rate, the overall annual utilization potential of poplar plantations will be 10 million m3, which constitutes a reliable resource of raw timber for use in wood and paper industries.[返回]
下载频数：16 上传时间：2014-02-27
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