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匹配条件: “Masoud Tabari” ,找到相关结果约1159条。
Survival, Growth and Vitality Effects of Man-Made Fagus orientalis Seedlings after Cleaning Sambucus ebulus in a Caspian Forest Site
Masoud Tabari
International Journal of Botany , 2008,
Abstract: Survival, growth and vitality of 3-year-old man-made oriental beech (Fagus orientalis Lipsky) seedlings were examined in a 200 m2 canopy gap of mountain beech forest, occupied by elder (Sambucus ebulus L.) in a Caspian forest site (Northern Iran). In mid-June 2000, two treatments including (a) cleaning Sambucus (b) leaving Sambucus were made at four plots of 2.5x2.5 m within the gap. The results two years after examination (cleaning treatment) and at the end of the growing season (late November) revealed that height growth as well as survival and vitality quality was significantly of better condition in controlled area than in Sambucus cut area. It implies that in the small gaps, the characteristics of F. orientalis seedlings do not decline under Sambucus competition. It is suggested that in such gaps, cleaning Sambucus can be avoided during early years.
Germination and Initial Growth of Fagus orientalis Seedling under Different Stand Canopies
Masoud Tabari
Journal of Applied Sciences , 2008,
Abstract: Germination and early growth of Fagus orientalis seedling were studied in four stands with different canopy closures (closed, semi-closed, relatively-opened and opened stands) under a dominant beech forest, located in north of Iran. For this purpose, 196 beech seed-sown plastic pots (in four plots of 49 units) were set up under each canopy closure. In the beginning of the first growing season germination rate ranged between 78.1 and 84.7% in different stands but there was no statistically significant difference of this term in the stands. In the end of the first growing season survival rate of seedlings was 73.9-76.1% under closed and semi-closed stands. It decreased significantly to 31.7 and 18.0% under relatively-opened and opened stands, respectively. Shoot length was, in the order 70 and 90 mm in closed and semi-closed stands. It decreased to 40 and 30 mm in relatively-opened and opened stands, respectively. Vitality appeared mostly with high quality in closed and semi-closed stands and with low quality in relatively-opened and opened stands. Leaf biomass reduced in closed stand. There was an increase for leaf area in semi-closed stand and for Specific Leaf Weight (SLW) in relatively-opened and opened stands. Generally, the investigation shows that in the first growing season most characteristics of beech seedling were benefited from more favorable conditions in the denser stands (closed and semi-closed canopies).
Early Growth of Direct-Seeded Quercus castaneifolia (C.A. Meyer) Seedlings on Different Soils of Elm-Oak Stands
Masoud Tabari,Mahmoud Asri
Journal of Biological Sciences , 2008,
Abstract: In order to determine the initial growth and development of direct-seeded Caucasian oak (Quercus castaneifolia C.A. Meyer) seedling an experiment was carried out using the completely randomized design on three soils, of low (soil L), medium (soil M) and high (soil H) nutrient contents in elm-oak stands of the northern Iran. The results at the end of the first growing season demonstrated that values in most of characteristics measured statistically differed among soils. Survival rate, stem length, root length, apical shoot length, node number on the apical shoot, stem dry weight, leaf area and specific leaf area were greatest on soils H. Collar diameter and growth flush number did not differ among different soils. Likewise, nutrient elements in stem, root and leaf were mostly greatest on soil H. Generally, from this research it is deduced that in the elm-oak stands higher fertility soils are more favorable for growth and development of oak seedlings when using seed sowing.
Long-term impact of municipal sewage irrigation on treated soil and black locust trees in a semi-arid suburban area of Iran

Masoud Tabari,Azadeh Salehi,

环境科学学报(英文版) , 2009,
Abstract: The effects of municipal sewage irrigation on the soil and black locust (Robinia pseudoacacia L.) tree were studied. For this purpose, two artificial black locust stands under irrigation of municipal sewage and well water were selected in south of Tehran, Iran. Data were collected using technique of systematic random sampling with 4 replicates in each stand. It was found that the growth of black locust tree, as indicated by diameter at breast height, total height, crown length, average crown diameter, basal area and volume, in sewage irrigation stand was much higher than that of well water irrigation stand (P < 0.01). Plant analysis indicated that concentrations of leaf nutrients (N, P, K, Ca, Mg, Na, Fe, Mn, Cu and Zn) were greater in sewage-irrigated trees, without toxicity to the minerals of tree leaf, than those of well waterirrigated trees, and positively correlated with their respective value in soil. Ni, Cr and Pb were not detected in leaf samples. Application of sewage resulted in a 1.5-fold increase in the concentrations of soil nutrients, Ni, Cr and Pb. Among these minerals only Pb and Ni in some soil samples exceeded the toxicity limit. The increase in pH, electrical conductivity (EC) and organic carbon of soil was also observed in sewage irrigation. Results confirm that besides the use as irrigation water, municipal sewages are also a potential source of plant nutrients. However, significant accumulation of heavy metals such as Pb and Ni in soil needs to be monitored.
Acacia nilotica and Medicago sativa, Suitable Plants for Agro-Forestry in Southern Coasts of Iran
Mohammad Hassan Emtehani,Masoud Tabari
Pakistan Journal of Biological Sciences , 2007,
Abstract: Habitats of the multipurpose tree, Acacia nilotica, were identified along the coastline of the Persian Gulf and Oman Sea, south of Iran. Four sites were randomly chosen and in each one, vegetation as well as climatic and soil characteristics were studied. Likewise, biometry of Acacia trees was conducted and compared in the sites. The fodder values in leaf and fruit of Acacia were determined and compared with those of in foliage of Medicago sativa being managed under an agro-forestry system. By analyzing data it was revealed that the biggest trees were found in Dashteyari region and the smallest in Bamani region (both in the Oman Sea coast). Values in most of nutritional elements were higher in foliage of Medicago than in leaf and fruit of Acacia, respectively. From this investigation it is concluded that in south of Iran where the site is favorable for Acacia plantation, cultivation of Medicago or other adaptable crops together with Acacia can be developed as agro-forestry systems (such as undercropping and intercropping) if water is available.
Growth and Plant Diversity in a Man-Made Thinned Cedrus atlantica Stand
Mohammad Reza Poormadjidian,Masoud Tabari
Pakistan Journal of Biological Sciences , 2007,
Abstract: In order to study the growth characteristics of Atlas cedar (Cedrus atlantica Manetti) and to assess the plant diversity an investigation was carried out in a 30 year old man-made stand located in the Caspian mountain forests (north of Iran). In this stand a silvicultural treatment as thinning was operated in five replications of 200 m2 for removing 25% of basal area. Likewise five replications of 200 m2 were considered as control (unthinned). The results of 5 year investigation revealed that diameter growth of C. atlantica was two times greater in thinned stand than in unthinned stand (p<0.05). Height growth and basal area (b.a.) in thinned stand were not greater than those in controlled stand. Vitality quality in both treatments was fairly high. Fruit production was significantly more ample in thinned stand than in unthinned stand. Compared to unthinned stand, in thinned stand index of Simpson Diversity was greater but indices of Menhinic Richness and Peet Evenness were smaller. This study reveals that generally diversity has been increased in the managed stand. Besides that C. atlantica has been adapted to this region and therefore thinning practice can be a good measure for increasing timber production.
Comparison of Plant Diversity and Stand Characteristics in Alnus subcordata C.A.Mey and Taxodium distichum (L.) L.C. Rich
Masoud Tabari,Abdollah Rostamabadi,Ali Salehi
Ecologia Balkanica , 2011,
Abstract: Stand characteristics and understory plant diversity were investigated in low-drained man-made stands of Alnus subcordata C.A.Mey and Taxodium distichum (L) L.C. Rich. The trees were planted with distances of 3 × 3 m and 4 × 4 m in northern Iran. In these stands, herbaceous and woody species were counted in plots of 20 × 20 m. Then, indexes of richness, H/ diversity, J/ equitability and Jaccard similarity (JI), tree growths, cover crown percentage, and litter layer thickness of each stand were assessed following 17 years after planting. The results revealed that the greatest diameter at breast height (D.B.H) and stem height were observed in Alnus 4 × 4 m. By contrast, crown cover percentage and litter thicknesses were greater in Taxodium stands. Species richness, H/ diversity and J/ equitability indexes, Jaccard similarity (JI) of Alnus stands were greater than those of Taxodium stands. In reality, small and light canopy of Alnus is the main reason that the solar radiation can penetrate easily to forest ground and affect understory plant diversity. Alnus as a native tree species, due to greater growth attributes and higher diversity indices in their stands are proposed for plantations in such low-drained sites of northern Iran.
The Effect of Pleurotus spp. Fungi on Chemical Composition and in vitro Digestibility of Rice Straw
Javad Mirzaei,Masoud Tabari,Hadi Daroodi
Pakistan Journal of Biological Sciences , 2007,
Abstract: This study was carried out to test the potentially of using rice straw substrate for the cultivation of four Pleurotus species including Pleurotus florida, Pleurotus djamor, Pleurotus sajor-caju and Pleurotus ostreatus and the effect of these species on the chemical composition, cell wall degradation and digestibility of rice straw. Rice straw soaked in water for 24 h and then it was pasteurized at 100°C for 6 h. Rice straw was inoculated with spawns of four Pleurotus fungi (Pleurotus florida, Pleurotus djamor, Pleurotus sajor-caju and Pleurotus ostreatus) and packed in the plastic bags and incubated in a fermentation chamber at 23-27°C and 75-85% relative humidity. After 60th day, rice straw samples from all groups were taken and analyzed for chemical composition and in vitro digestibility. The data obtained were analyzed according to the complete randomized design model consisting of four treatments plus one control and four replicates. The results of this study showed that fungal treatment increased (p<0.05) the Crude Protein (CP), silica, Ca and P contents of the rice straw but the hemicellulose, Organic Matter (OM), Acid Detergent Fiber (ADF), Neutral Detergent Fiber (NDF) and Acid Detergent Lignin (ADL) contents decreased. However, the ability of the fungi to degrade these components varied among the species. The ability of Pleurotus sajor-caju and Pleurotus ostreatus were higher than the other species in decreasing the hemicellulose, NDF, ADF and ADL contents. The highest Biological Efficiency (BE) was produced by sajor-caju species with 56.02 and the lowest was belong to Pleurotus djamor species with an average 51.17%. All species of fungi incubated on rice straw showed increased (p<0.05) the in vitro dry mater and organic matter digestibility. Rice straw treated with sajor-caju fungus had the highest in vitro dry matter digestibility (IVDMD) and in vitro organic matter digestibility (IVOMD) with 80.10 and 82.18%, respectively. In general this experiment cleared that treatment with sajor-caju can improve the quality of rice straw to be useful feed for ruminant nutrition.
Early Growth of Quercus castaneifolia (C.A. Meyer) Seedlings as Affected by Weeding, Shading and Irrigation
Javad Mirzaei,Masoud Tabari,Hadi Daroodi
Pakistan Journal of Biological Sciences , 2007,
Abstract: The influence of shading, irrigation and weeding on survival, growth and morphology of 1-year Quercus castaneifolia seedlings was studied in north of Iran. The seedlings were grown under eight treatments including full-light versus artificial shading, irrigation versus non-irrigation and weed presence versus weed removing at three replicates. At the end of the first growing season seedling survival in all treatments was 100%. Weed removing had positive effect on height, diameter growth, slenderness coefficient and leaf area of Q. castaneifolia. Irrigation enhanced diameter growth and leaf area and shading increased leaf area. Irrigation had no significant effect on plant growth where the weed was removed. In weed plots seedlings growth and leaf area were greater in shading than in full-light. The results indicated that for 1 year Q. castaneifolia seedlings, weeding, in contrast to irrigation, is an essential factor. Where the weed competition is a difficulty, plantation with higher stem length should be applied.
Effect of drought stress on the germination parameters of Cupressus Seeds
Fatemeh Ahmadloo,Masoud Tabari,Behzad Behtari
International Journal of Forest, Soil and Erosion , 2011,
Abstract: To study the effect of drought stress on germination and some physiological characteristics of Cupressus arizonica and C. sempervirens seeds including germination percentage, mean germination time (MGT), germination speed, germination energy, vigor index and recovery percentage, a factorial experiment in completely Randomized Design (CRD) was arranged with five treatments of osmotic potential and 4 replications. The water potential of the germination substrates (0, -2, -4, -6 and -8 bars) was conducted using PEG-6000 solutions. The seeds were kept for 37 days in germinator and 8-16 hours (radiation-darkness) and at 20 ± 0.5°C. The results indicated that drought stress had significant effect on seed physiological characteristics in both species. Decreasing water absorption potential from 0 to -8 bars, significantly reduced germination percentage, speed, energy, and vigor index and increased mean time of germination in both species. The highest recovery percentage was observed in -8 bars. Germination percentage and germination speed, vigor index and recovery percentage of C. sempervirens was better than C. arizonica that probably is more resistant species to drought stress.

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