samane mohamadi; Adel Sepehry; Mohammad Farzam; Hosein Barani
Volume 30, Issue 3 , January 2024, , Pages 457-473
Abstract
IntroductionThe present research on Lycium depressum stocks aims to study the vegetative responses (leaf area, leaf specific weight, leaf specific area, dry weight ratio of root to shoot, dry weight of leaf, stem, and root) of the pasture shrub of Kam Tigh against drought stress and the effect of soil ...
Read More
IntroductionThe present research on Lycium depressum stocks aims to study the vegetative responses (leaf area, leaf specific weight, leaf specific area, dry weight ratio of root to shoot, dry weight of leaf, stem, and root) of the pasture shrub of Kam Tigh against drought stress and the effect of soil amendment on these responses. Materials and methods The experiment was conducted in a factorial design based on a completely randomized design, including the main irrigation treatment at four levels (100, 75, 50, and 25% of crop capacity) and sub-treatment of soil conditioners under semi-controlled greenhouse conditions. The experiment involved five repetitions and 160 pots for each combined irrigation and soil amendment treatment. Sub-treatments of soil conditioners, including Stacosorb hydrogel, were added at 3 grams per kilogram of soil in each pot in the lower part of the plant roots. Mineral Zeolite in 8 grams per pot was placed in the lower part of the plant roots. Nitrobacter was added in the amount of 3 cc in each pot in the upper root area of the plant. Mycorrhiza at 10 grams per pot was added to the lower plant roots. Results and discussionGenerally, a significant difference (p<0.05) was observed in all irrigation levels between the treatments in each soil amendment material. In zeolite with mycorrhiza, the highest stem dry weight and leaf-specific weight were obtained at a 50% irrigation level. With the increase in leaf-specific gravity and drought stress, plant dry weight increased, and proline content decreased in Nitrobacter and mycorrhizal treatment, which differed from the treatment. Measurements of leaf area revealed that leaf area decreased from 1450 mm2 in 100% and 75% irrigation to 900 mm2 in 25% irrigation. This indicated the impact of drought stress on the leaf area. The highest specific weight of leaves at 25% irrigation was related to Nitrobacter with mycorrhiza. This modifier increased the specific weight of leaves from 0.0025 g/m2 at 100% irrigation level to 0.0028 g/m2 at 25% irrigation level. Leaf surface area in Nitrobacter treatment with mycorrhiza during 100% irrigation decreased from 400 mm2/g to 350 mm2/g during 25% irrigation. In hydrogel treatment without mycorrhiza, the dry weight ratio of root to shoot at 100% irrigation level declined from 2 grams to 1.4 grams in 25% irrigation. The dry weight of the leaf decreased from 1.4 g in 100% irrigation to 1.3 g in 25% irrigation. ConclusionsBiofertilizers enhance plant resistance to drought stress by improving vegetative characteristics. Nitrobacter treatments without mycorrhiza, hydrogel, and zeolite with mycorrhiza are recommended for planting this plant due to improved growing conditions. Since the Kam Tig plant is considered a medicinal plant, it can be used as a soil conditioner in the pharmaceutical and medical industries. This will enable better cultivation of the species. All organizations related to the cultivation of Kam Tig species can use the results of this research to enhance cultivation projects.
Zohreh Mirdeylami; Gholam Ali Heshmati; Hosein Barani; Yalda Hematzadeh
Volume 19, Issue 2 , September 2012, , Pages 333-343
Abstract
Recognition of ecological factors affecting the establishment and distribution of plants is necessary and the use of multivariate analysis could be useful to achieve this purpose. In the current research, relationship among the most effective environmental parameters on distribution and establishment ...
Read More
Recognition of ecological factors affecting the establishment and distribution of plants is necessary and the use of multivariate analysis could be useful to achieve this purpose. In the current research, relationship among the most effective environmental parameters on distribution and establishment of vegetation types of Kachik Watershed was studied by multivariate analysis method. After providing land unit maps, density and canopy cover percentage were measured in reference areas of each land unit. Random-systematic method was used and sampling was performed on 53 quadrates established on 19 transects with intervals of 150 m. Soil samples were taken from the depth of 0-30 cm and pH, EC and percentage of clay, silt and sand were measured. Six separate ecological groups were identified by cluster analysis. Results of principal component analysis revealed that aspect, slope, pH, EC, soil texture and Ca had the most effect on distribution of ecological groups with correlation coefficients of 0.98, 0.96, 0.93, 0.89, 0.82 and 0.81, respectively.
Masumeh Hosseini nasab; Hossein Barani; Ghasem ali Dianati Tilaki
Volume 17, Issue 1 , September 2010, , Pages 166-179
Abstract
Managing ranch units has been one of the important issues during the last decades in studying the rangeland of Iran. The most noticeable system for range management based on grazing licene is one of the three types of council، collective and private exploitation. One of the implementing methods concerning ...
Read More
Managing ranch units has been one of the important issues during the last decades in studying the rangeland of Iran. The most noticeable system for range management based on grazing licene is one of the three types of council، collective and private exploitation. One of the implementing methods concerning the balance between livestock and range and reduction of range degradation is the introduction of reasonable range utility units. The present study seeks to compare different ownership types with considering independent variables of rangeland condition، exploitation and the capability degree of collective and private ownership so as to introduce the most appropriate method for user's inclination and better quality. According to goals and assumptions، 105 questionnaires were completed through direct interview with exploiters (only those who owned grazing licene). The state of the rangeland in 41sample ranges was calculated through 4 factories. The results showed the condition of private rangeland has been obtained to be better than the collective rangelands ،however، no meaningful difference in rangelands management methods in this type of possession. Because of improper exploitation methods in this county، council exploitation is not suggested. Despite its probable weaknesses, the collective possession، because of its high partnership spirit among collective beneficiaries، by some conservatism can be more appropriate than other types and its deficiencies can be reduced by proper management and create the motivation of conserving natural resources by special programs among people. Regarding that the majority of ranges are commonly used, establishing cooperatives and giving the right of utilization to cooperatives is of priority based on the peoples' opinions.