林业科学与实践(英文版)
论文题目：Regeneration of tree species in the sub-tropical forest of Alaknanda Valley, Garhwal Himalaya, India
全部作者： Radha BALLABHA, J. K. TIWARI, P. TIWARI
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：We studied the regeneration of tree species in the sub-tropical forest of Alaknanda Valley in Garhwal Himalaya India. The overall regeneration status was fairly good in the study area. Seedling density ranged between 520 and 1,240 seedlings per ha while the density of saplings varied between 400...[查看全部]
论文摘要：We studied the regeneration of tree species in the sub-tropical forest of Alaknanda Valley in Garhwal Himalaya India. The overall regeneration status was fairly good in the study area. Seedling density ranged between 520 and 1,240 seedlings per ha while the density of saplings varied between 400 and 800 saplings per ha. Out of eight sites tudied, five sites, viz., A1, A2, B1, B2 and C2 contained the highest number of seedlings (280-480 per ha) and saplings(200-440 per ha) for Pinus roxburghii and remaining three sites viz., C1, D1 and D2 represented the highest number of seedlings (240-400 per ha) and saplings (200-240 per ha) for Anogeissus latifolius. The DBH class distribution of the tree species revealed that the highest number of individuals was concentrated in the bower diameter classes while smallest numbers were found in the higher diameter classes. Species such as Acacia catechu, Anogeissus latifofius, Dalbergia sissoo, Engelhardtia spicata. Lannea coromandelica, Mallotus philippensis and Pinus roxburghfi have the largest number of saplings and seedlings in the lower DBH classes, suggesting that they have good regeneration potential. Other species such as Aegle marmelos. Bauhinia variegata, Bombax ceiba, Cassia fistula, Erythrina variegata. Haldinia cordifolia, Mangifera indica, Ougeinia oojeinensis, Phyllanthus emblica, Syzygium cumini, Terminalia alata and Toona hexandra have either no or very small number of saplings in the lower DBH classes, which indicates that the status of these species implies poor regeneration.[返回]
下载频数：140 上传时间：2013-07-17
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论文题目：Effects of soil moisture regimes on growth and photosynthesis of the riparian plant Bolboschoenus planiculmis
全部作者： Lin HUANG, Yi-Ke PENG, Hong-Li LI, MingoXiang ZHANG, Fang-Li LUO
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：Plants distributed in riparian regions experience frequent episodes of flooding and drought between years, and hence, riparian plants need to be flood-and drought-tolerant. Riparian plants possess various traits to survive flooding, while their sensitivity to drought has received less attention....[查看全部]
论文摘要：Plants distributed in riparian regions experience frequent episodes of flooding and drought between years, and hence, riparian plants need to be flood-and drought-tolerant. Riparian plants possess various traits to survive flooding, while their sensitivity to drought has received less attention. To investigate the growth and photosynthetic responses of a riparian species (Bolboschoenus planiculmis) to flooding and drought, plants of this species were subjected to 60-d flooding or drought stress under greenhouse conditions. Growth and photosynthetic traits were measured at the end of the treatments. As well, we determined the efficiency of photosynthetic apparatus in mature leaves. Plants of B. planiculmis adequately adjusted their growth and photosynthetic traits under both flooding and drought conditions. Flooding did not affect the above-ground growth of B. planiculmis. Increased growth of roots and rhizomes and the generation of new tubers suggested a high ability of below-ground lateral growth by capturing resources under flooding conditions. Enhanced photosynthetic capacity, retained leaf pigment concentrations and chlorophyll a fluorescence capacity indicated photosynthetic adaptation to flooding. In contrast, drought significantly decreased the above-ground growth of B. planiculmis, especially the leaves, thereby minimizing water loss due to transpiration. Its increased root to shoot ratio and "phalanx" asexual propagation pattern might enhance soil water uptake ability. Although the functional leaves of B. planiculmis could retain their leaf pigment concentrations, as well as photosynthesis and chlorophyll a fluorescence, the total biomass of plants decreased, which may be a consequence of the reduced leaf area, suggesting adverse effects by drought. Therefore, both growth and photosynthetic responses of B. planiculmis are likely to contribute to the ability of this species to thrive in riparian regions, but remain susceptive to drought.[返回]
下载频数：65 上传时间：2013-07-17
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论文题目：Some ecophysiological characteristics of arta (Calligonum comosum L' Herit) in response to drought stress
全部作者： A. RANJBARFORDOEI1, P. VANDAMME2, R. SAMSON3
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：Water deficit is an important environmental factor restricting plant growth and photosynthesis. The effect of water deprivation on leaf water status, photosynthetic gas exchange, chlorophyll content and fluorescence parameters of arta (Calligonum comosum) was studied. Five-month-old arta...[查看全部]
论文摘要：Water deficit is an important environmental factor restricting plant growth and photosynthesis. The effect of water deprivation on leaf water status, photosynthetic gas exchange, chlorophyll content and fluorescence parameters of arta (Calligonum comosum) was studied. Five-month-old arta seedlings, grown in pots in the open air, were subjected to one of four drought treatments (i.e., mild, moderate, severe and extreme drought stress) and compared to control seedlings (normal watering regime). Results show that leaf water potential, net photosynthesis, stomatal conductance, transpiration, photosynthetic pigment content (chlorophyll a and b) decreased with increasing levels of drought stress. Inactivation of the photosynthetic apparatus was accompanied by changes in the fluorescence characteristics, providing evidence that reduction of photosynthetic rate could be attributed to non-stomatal limitations. Alterations imply changes in photochemical conversion efficiency of photosystem Ⅱ by which plants could reduce water transpiration or protect their photosynthetic apparatus from destruction. These adaptations are discussed in relation to the strategies developed to grow drought-resistant arta seedlings in desert environments.[返回]
下载频数：110 上传时间：2013-07-17
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论文题目：Effects of variation in seed sources and pre-sowing treatments on seed germination of Tamarindus indica: a multi-purpose tree species in Bangladesh
全部作者： Md. Salim AZAD1,2, Nurun NAHAR1, Md. Abdul MATIN1
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：We investigated the morphology and germination of Tamarindus indica seeds in order to discover the effects of variation in seed sources and pre-sowing treatments on germination. The experiment was carried out in the nursery of the Forestry and Wood Technology Discipline, Khulna University,...[查看全部]
论文摘要：We investigated the morphology and germination of Tamarindus indica seeds in order to discover the effects of variation in seed sources and pre-sowing treatments on germination. The experiment was carried out in the nursery of the Forestry and Wood Technology Discipline, Khulna University, Bangladesh. Seeds were collected from different but healthy trees from various locations in Bangladesh and subjected to four pre-sowing treatments, i.e., control. immersion in cold water (4℃ for 24 h), immersion in hot water (80℃ for 10 min) and scarification with sand paper. Seed germination was carried out in poly-bags with a mixture of topsoil and cow dung in the ratio of 3:1. The average length of the fresh seeds was 1.35±0.26 cm, their width 1.07±0.20 cm and thickness 0.69±0.11 cm. The results revealed that pre-sowing treatments affected the germination process of seeds, which significantly increased the germination percentage with the cold water (81.67%) and scarification with sand paper (82.33%) treatments, compared with those in the control (58.33%) and hot water treatment (59.00%). In all treatments germination started on average within 5 to 7 days after the start of the treatments and were completed from 13 to 19 days later. The greatest success in germination(82.33%) was found in scarification with sand paper, followed with 81.67% in the cold water treatment. The results of analyses of variance (ANOVA) showed significant differences (p < 0.05) in germination closing dates, seed germination periods and germination percentages among the treatments but no significant difference among seed sources. However, the effect of the interaction between seed source variation and pre-treatment differed significantly in seed germination closing dates and germination percentages. We recommend cold water treatment (submersion of seed at a temperature of 4℃ for a 24-h period) for seed germination of T. indica in rural Bangladesh.[返回]
下载频数：384 上传时间：2013-07-17
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论文题目：Runoff and sediment concentration of different parts of a road in Hyrcanian forests
全部作者： Majid LOTFALIAN1, Aidin PARSAKHOO2, Ataollah KAVIAN3, Seyed Ataollah HOSSEINI1
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：Road prisms, such as cutslopes, fillslopes and road surfaces, can be important contributors of sediment to streams in forested watersheds. In this study rainfall simulations were carried out on cutslopes, fillslopes, road surfaces and forest grounds in hardwood forests of Lolet and Lat Talar,...[查看全部]
论文摘要：Road prisms, such as cutslopes, fillslopes and road surfaces, can be important contributors of sediment to streams in forested watersheds. In this study rainfall simulations were carried out on cutslopes, fillslopes, road surfaces and forest grounds in hardwood forests of Lolet and Lat Talar, Iran. Water at intensity of 32.4 mm.h-1 was sprayed from a nozzle onto a square area of 0.48 m2. Runoff was collected by water gauge every 4 min and then runoff and sediment parameters were measured in each plot. Results indicated that on road surfaces, the runoff coefficient was 63.28%. On the cutslopes and fillslopes, the runoff coefficients were 35.14% and 10.23%. respectively. On the forest ground as a control, the runoff coefficient was 5.90%. Runoff volume was 2.73 mL.s-1 on the road surfaces and 1.52 mL.s-1 on cutslopes. On fillslopes the runoff volume was 0.44 mL.s-1 and on the forest ground 0.25 mL.s-1 The greatest rate of soil oss was found on the cutslope (280.79 g.m-2.h-1). The total soil loss from the cutslopes was two times higher than that from the road surfaces and six times higher than that from the fillslopes. We conclude that cutslopes can be considered the main source of sediments in our study sites, but the function of road surface as a source of runoff generation is more important.[返回]
下载频数：122 上传时间：2013-07-17
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论文题目：Natural durability of wood of ten native species from northeastern Mexico
全部作者： Artemio CARRILLO1, Rahim FOROUGHBACHK2, Veronica BUSTAMANTE1, Christian WEHENKEL3, Humberto GONZALEZ1
期刊名称：林业科学与实践(英文版) 2013年第2期
论文摘要：Thorn scrub vegetation in Mexico is distributed over 50 million ha, where native tree species are the source of forage, timber, firewood and charcoal. Research describing wood durability of species from this vegetation type has not been fully determined, nor classified according to international...[查看全部]
论文摘要：Thorn scrub vegetation in Mexico is distributed over 50 million ha, where native tree species are the source of forage, timber, firewood and charcoal. Research describing wood durability of species from this vegetation type has not been fully determined, nor classified according to international standards. Thus, the aim of this study was to determine and classify the natural durability of ten woody species. Their natural durability was determined according to the European Pre-Norm 807, the loss of dynamic modulus of elasticity (MOEdyn) (MPa) was determined and wood mass loss(g) after being exposed to Trametes versicolor and Coniophora puteana fungi. Wood durability was classified according to the European Norm 350-1. Highly significant differences (p<0.001) were found between the durability of woody species. The more durable species with lower MOEdyn lost were Condalia hooked (57.5%±0.6%), Havardia pallens(58.2%±0.4%) and Acacia schaffneri (58.9%±6.3%). Species with lower mass loss after exposed to Coniophora puteana were Ebenopsis ebano (6.3%±1.9%), Condalia hooked (8.6%±2.3%) and Cordia boissieri (11.8%±2.3%). E. ebano (7.1%±2.4%), Condalia hooked (8.2%±2.5%) and Cordia boissieri (11.5%±3.1%) showed the lower mass lost after exposed to T. versicolor. According to European Norm 350-1, three woody species were classified as very durable and durable species.[返回]
下载频数：121 上传时间：2013-07-17
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