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Articles by M. Tabari
Total Records ( 5 ) for M. Tabari
  M. Tabari , A. Salehi and A.R. Ali-Arab
  A case study was undertaken to assess the long-term effects of irrigation with municipal waste water on heavy metals contamination of soil and leaf of black locust (Robinia pseudoacacia L.) trees. For this purpose, a field study was conducted at two sites irrigated by waste water and well water in the suburban areas of Tehran, Iran. Samples of irrigation water, soil and tree leaf were collected and were analyzed for Mn, Fe, Cr and Cd concentrations. Results indicated that municipal waste water had higher significantly (p<0.01) amount of Mn, Fe and Cr compared to well water. These heavy metals in waste water were upon the internationally recommended (WHO) maximum permissible limits set for land use. Heavy metals accumulation of soil was significantly greater in waste water-irrigated site and in depth of 0-15 cm. The mean of heavy metals concentration in soil was below the standard for all heavy metals. Fe and Mn concentrations in leaf of trees irrigated with waste water were significantly greater than those in well water but without risk. Cr and Cd were not detected in leaves and also Cd in water and soil samples. It was concluded that the use of waste water in irrigation might enriched soils with heavy metals to concentrations that may pose potential environmental and health risks in the long-term. Hence regulations about the utilization of waste water in irrigation should consider for control heavy metals content that may be added to soil, in order to minimize the risk of negative effects to ecosystem health.
  A.T. Saravi , M. Tabari , K. Espahbodi , H.M. Nodoushan and B. Enayati
  In this study, the phenotypic correlation between several seed source and seedling characters on wild service tree (Sorbus torminalis L. Crantz.) was investigated by a half-sib progeny test in North of Iran. Seeds of Ashak and Sangdeh Provenances (2100-2300 and 1600-1800 m a.s.l., respectively) were collected from the individual parent trees (20 single trees from each provenance) and sown in a mountain nursery (Orimelk, 1550 m a.s.l) based on a randomized complete block design with three replications. Both provenances showed a high and positive significant correlation between the characters measured on progenies. Although Sangdeh Provenance was selected as a proper site for seed collection and seedling production in this nursery, because of limitation of genetic variation and conservation of species, the selection of well-formed parent wild service trees of Ashak Provenance could be a good measure for this target. It can be concluded that at selection stage, if genotypes with greater collar diameter and height and less branch angles be selected as the parent trees, the seedlings (progenies) with higher survival and growth would be achieved.
  M. Tabari , Jalali , Gh. A , A.R. Ali-Arab , M. Akbarinia and S.M. Hosseini
  Abstract: Due to failure of oak (Quercus castaneifolia C.A. Meyer) natural regeneration, investigation on the best acorn sowing depth of this species under different levels of canopy cover is an important consideration in the Caspian forests, north of Iran. For this purpose, a study site with north-facing slope, clay-loam soil and 260-280 m a.s.l. was chosen in a mixed oak forest. The experiment was conducted as a Complete Randomized Split Plot Design (CRSPD) and the measurements made in one growing season in nine fenced circular 1000 m2 plots with three canopy densities (25, 50 and 75%) at three soil depths (5, 10 and 15 cm). The results revealed that under all canopy densities the maximum seedling emergence occurred at 5 cm depth. The highest emergence rate was appeared in June and the lowest in October. Neither canopy density nor sowing depth did prominently reduce seedling establishment, but a high quotient of mortality likely could be attributed to rodent populations, particularly Hystrix indica. Under all canopies, ground line diameter decreased with increasing sowing depth, the biggest being at 5 cm depth. Neither canopy density nor sowing depth influenced the seedling height. It can be concluded that the best performance of Q. castaneifolia seedling occurs at 5 cm sowing depth and 25% canopy cover.
  M. Tabari and A. Salehi
  To obtain estimates of carbon sequestered following afforestation, we studied the amount of soil carbon sequestration in two 15-year old stands of needle-leaved eldar pine (Pinus eldarica Medw.) and broad-leaved black locust (Robinia pseudoacacia L.) and a control area (without afforestation) in South of Tehran, Iran. For this purpose, sample plots (30x30 m) were randomly chosen in either site. In each plot, samples from depths of 0-15, 15-30 and 30-60 cm of four soil profiles were taken for investigations. In laboratory, Soil Organic Carbon (SOC) content of samples was determined by the Walkley-Black method. No significant difference in the amount of soil carbon sequestration of two stands was detected, but each stand sequestered higher carbon content in soil compared to that of in control area. In all soil samples, the highest carbon sequestration was observed in upper layer of soil. Likewise, values of growth and biomass of eldar pine trees were greater than those of black locust trees. It was concluded that there is a great potential of afforestation, in increasing of soil carbon sequestration.
  J. Karami and M. Tabari
  Morphology and nutrient of leaf in Quercus castaneifolia (C.A.Meyer) seedlings in competition with blackberry (Rubus fructicosus L.) was investigated in an intervened lowland forest of Noor city, north of Iran. The research was conducted as factorial experiment in three replications. For this purpose, seedlings of small (3 mm) and large (4 mm) in collar diameter (CD) were sown in two treatments (i) covered with Rubus and (ii) moved from Rubus in 0.5 m radius around the Quercus seedling, replicated three times. In the end of the first growing season, leaf samples were randomly taken from 9 seedlings in each treatment in order to determine leaf number, leaf dry matter, leaf area, growth flush number, apical shoot growth and concentrations of leaf nutrient (N, P, Mg and Ca). Leaf dry matter did not differ among the treatments. Leaf number and leaf area were greatest with large CD seedlings growing in moved Rubus area. The greatest apical shoot growth was observed with large CD seedlings growing in full Rubus area. The same as growth flush number, concentration of P, N and Mg was greatest with small CD seedlings in moved Rubus area. From this research it can be deduced that the seedlings growing in moved Rubus area produce greater plant biomass and mineral nutrient matter.
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