Jahanbakhsh Teymuri Majnabadi; Parvin Ramak; vahid karimian
Abstract
The present research aims to investigate the effect of temporal succession on the biological operation of planting Haloxylon persicum on the functional characteristics of rangelands in Khaf County. Three rangelands in which H. persicum planting operations were performed at different ages of 10, 20 and ...
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The present research aims to investigate the effect of temporal succession on the biological operation of planting Haloxylon persicum on the functional characteristics of rangelands in Khaf County. Three rangelands in which H. persicum planting operations were performed at different ages of 10, 20 and 30 years, and the control area were selected. Sampling along 3 transects of 100 meters, located 10 meters apart, were measured and analyzed for each area and a total of 12 transects. Using the function analysis method, three characteristics of stability, infiltration and nutrient cycle were measured using 11 soil surface indexes. The results showed that there is a significant difference between the succession times for biological restoration from the functional point of view (P <0.01). The highest degree of stability and infiltration is related to the H. persicum range of 30 years old and the smallest of it belongs to the control area. There is a significant difference between the biological regeneration time of H. persicum planting and the control area in terms of nutrient cycle index (P <0.01). The highest levels of nutrients are related to the 30-year-old H. persicum, 20-year-old H. persicum, 10-year-old H. persicum, and the control area. In general, the results of the present study indicate positive biologic effects on the characteristics of the rangeland function, and these positive effects are evident in increasing the functional indexes over time.
Morteza Saberi; vahid karimian; Hamid Niknahad Gharemakhar
Abstract
Many regular visits were done to investigate the phenological stages of the plant in Zabol and Saravan habitats. Plant cover of the species was investigated by plot with 4 square meter along to 4 transect with 200 meters. To investigate their physicochemical properties of soil, soil sample were taken ...
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Many regular visits were done to investigate the phenological stages of the plant in Zabol and Saravan habitats. Plant cover of the species was investigated by plot with 4 square meter along to 4 transect with 200 meters. To investigate their physicochemical properties of soil, soil sample were taken from 0-30 cm depth under the species and area without species. Forage quality index was analyzed by 4 replication on three phenological stages (vegetative, flowering and maturity stages). Results indicated that the first leaves of the species were initiated in March and August is the end of growing period. The average of canopy cover and density of Citrullus colocynthis had significant difference in the two regions (P<0.01). The rooting depth of this species was 207 and 123 centimeters in Zabol and Saravan habitats, respectively. The results showed that the electrical conductivity, carbon and organic matter under the studied species were significantly higher than the control area. The results of soil analysis under the species of two habitats also showed that sand, silt, acidity, lime and organic carbon content were significant at 5% level (p <0.05) and organic matter was significant at 1% level (p <0.01). Also, the average of sand, acidity, organic creatinine and organic matter of Zabol habitat was higher than Saravan, but the amount of silt and lime in the plant cover was higher in Saravan than that of Zabol.
Morteza Saberi; vahid karimian
Abstract
The studies of functional features of patches of rangelands will help effectively in the detection the healthiness of arid and semi-arid rangelands, the improvement of soil conditions as well as the recognition of the effects of managerial and natural changes of rangelands. In order to investigate the ...
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The studies of functional features of patches of rangelands will help effectively in the detection the healthiness of arid and semi-arid rangelands, the improvement of soil conditions as well as the recognition of the effects of managerial and natural changes of rangelands. In order to investigate the function of landscape, sampling from Niatak region of Sistan was conducted in the same condition that had some native plant species such as Alhagi camelorum and Salsola rigida and two planted species namely Tamarix ramosissima and Haloxylon persicum. Effect of these plant pots was investigated on characteristics of ecosystem function. 4 transect with 150 meters long was established and 11 soil surface indices was determined by using of three characteristics of stability, infiltration and cycling of nutrient from LFA method. The results indicated that two planted plant species had higher function rather than native plant species and differences were significant. Tamarix ramosissima had the highest function among the native and established plant species. In general, high function in planted patches ecological could be suggested to select suitable species in restorations of similar rangeland.
Gholam Ali Heshmati; vahid karimian
Abstract
To apply scientific and proper management of rangeland ecosystems, having information on health and functions indices of ecosystem is required. Using landscape function analysis, the present study deals with assessing and comparing of ecological indices in northern and southern landscapes, Darehkonari ...
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To apply scientific and proper management of rangeland ecosystems, having information on health and functions indices of ecosystem is required. Using landscape function analysis, the present study deals with assessing and comparing of ecological indices in northern and southern landscapes, Darehkonari Khashab of Gachsaran. Length and width for ecological patches in northern landscapes in species Astragalus fasciculifolius Boiss, Centaurea intricanta Boiss, Cousinia multiloba DC, and inter patches(bare and litter), in southern ones on species Cousinia multiloba DC, Stachys byzantina C. Koch, Stachys byzantina C. Koch and Cousinia multiloba DC and inter patches were recorded along three 50 m transects across both southern and northern aspects. In addition, eleven soil surface indices were measured. These indices belong to three main characteristics of soil stability, infiltration and nutrient cycling. The results showed that the indices of stability and nutrient cycling in both landscapes have a significant difference (p <0.05), but this was not case for infiltration index (p>0.05). The main ecological indicator of northern and southern landscapes are C. intricanta and S. byzantine + C. multiloba, respectively.
