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The water deficit in arid and semi-arid regions is the primary limiting factor for the development of urban greenery and forestation. In addition, planting the species that consume low levels of water is useful in arid and semi-arid regions that have poor water management measures. Leaf water potential (Ψ) is a physiological parameter that can be used to identify drought resistance in various species. Indeed, Ψ is one of the most important properties of a plant that can be measured using a pressure chamber. Drought avoiding or drought resistant species have a lower Ψ than plants that use normal or high levels of water. To determine drought resistance of species that are suitable for afforestation in arid urban regions, we evaluated twenty woody species in the Isfahan City, central Iran. The experimental design was random split-split plots with five replications. The species were planted outdoor in plastic pots and then subjected to treatments that consisted of two soil types and five drip irrigation regimes. To evaluate the resistance of each species to drought, we used the Ψ and the number of survived plants to obtain the drought resistance index (DRI). Then, cluster analysis, dendrogram, and similarity index were used to group the species using DRI. Result indicates that the evaluated species were classified into five groups: (1) high water consuming species (DRI>-60 MPa); (2) above normal water consuming species (-60 MPa≥DRI>-90 MPa); (3) normal water consuming species (-90 MPa≥DRI>-120 MPa); (4) semi-drought resistant species (-120 MPa≥DRI>-150 MPa); and (5) drought resistant species (DRI≤-150 MPa). According to the DRI, Salix babylonica L., Populus alba L., and P. nigra L. are high water consuming species, Platanus orientalis L. and Albizia julibrissin Benth are normal water consuming species, and Quercus infectoria Oliv. and Olea europaea L. can be considered as drought resistant species. 相似文献
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Maryam Rezashateri Sayed Jamaleddin Khajeddin Mohammad Mahdi Majidi Sayed Hamid Matinkhah 《Archives of Agronomy and Soil Science》2017,63(7):984-997
The effects of super absorbent polymers (SAPs) on growth characteristics and seedlings survival of Artemisia sieberi (under two soil textures, three irrigation levels and seven hydrogel compositions with three replications) were investigated. The studied traits were shoot height, shoot dry weight, root dry weight, ratio of root/shoot, root length, root perimeter, root area and root volume. SAPs successfully enhanced growth capability of A. sieberi in two soil textures compared to the controls. Ideally, 5 g kg?1 Aquasorb? (SNF Company, France) with 100% irrigation and 10 g kg?1 Stockosorb® (Evonik Corporation, Germany) with 75% irrigation in a sandy loam texture and 10 g kg?1 Boloorab A? (Boloorab Company, Iran) with 75% irrigation in a loamy texture significantly affected all traits, resulting in 100% survival for A. sieberi seedlings. Aquasorb? and Stockosorb® showed the best results in the sandy loam texture and preferable outputs were obtained by Boloorab A? application in the loamy texture. In other words, because of the basic differentiation among soils in terms of mineralogy, temperature and moisture content, different SAPs should be applied. Production of dense root network and root aggregation stimulated by SAPs increased root contact with moisture. Therefore, improving the growth and survival of the plants is accessible using SAPs under water stress condition. 相似文献
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SayedHamid Matinkhah Marzieh Taabe Mohammadreza Raoofi S. Mojtaba Matinkhah 《Arid Land Research and Management》2016,30(3):304-319
The success of plantation, establishment, and growth of trees and shrubs is an important concern in afforestation efforts. There have been extensive efforts to use Haloxylon ammodendron in many desert areas throughout the world in desert combating projects, but these efforts have not always been successful, despite high costs. In this study, we propose a new application of fuzzy decision-making method for selecting suitable sites for the growth of this species. We determine, based on available autecological studies, the most effective factors in desert habitats, and a fuzzy membership function is designed for each of the factors. A suitability index is constructed by unifying the fuzzified factors. This model is then applied to an actual plantation area to evaluate the suitability of different parts of this trial area. Finally, the predicted results are compared to the actual rate of success, based on the canopy cover percentage. The coefficient of determination for the observed canopy cover percentage plotted against the predicted suitability values is higher than 98%, which demonstrates that the presented fuzzy decision-making approach is potentially a powerful tool in site selection for this and, probably, other species. 相似文献
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Mansour Karkon Varnosfaderani Rasoul Kharazmi Aliakbar Nazari Samani Mohammad Reza Rahdari Seid Hamid Matinkhah Nasrollah Aslinezhad 《林业研究》2017,28(1):145-153
The status of woody plants in dry-land systems is a fundamental determinant of key ecosystem processes. Monitoring of this status plays an important role in understanding the dynamics of woody plants in arid and semi-arid ecosystems. The present study determined the dynamism of the Zagros forests in Iran using Remote Sensing and Geographic Information System techniques and statistical science. The results show that the density of trees varied from 10 to 53 % according to the physiographic and climatic conditions of semi-arid regions. The best and lowest correlation between vegetation indices and forest density were obtained for the global environmental monitoring index (GEMI; R 2 = 0.94) and soil adjust vegetation index (R 2 = 0.81), respectively. GEMI is used to monitor land use changes over a 10-year period. Results show that 2720 ha2 of forest have been destroyed by human interference and tillage on steep slopes during this period which also resulted in the loss of the fertile soil layer. GEMI determined the areas with a biomass of trees and could normally separate border regions with low biomass density of trees from regions without canopy cover. The results revealed that assessment of forest and vegetation cover in arid and semi-arid arduous forest regions using satellite digital numbers and ordinary sampling is subject to uncertainty. A stratified grouping procedure should be established to increase the accuracy of assessment. 相似文献
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