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Introduction: Extensive degradation in rangelands and forests of Iran due to livestock grazing and land use change in recent decades, the need for a basic understanding of the ecological characteristics of native plant species and how they respond to environmental factors for use in rangeland management. Taverniera spartea from the Fabaceae legume family is one of the important species of the Persian Gulf and Omani rangelands of Iran. This plant is considered as a rich source of plant protein and has a high value in animal nutrition. It also plays an important role in the biological stabilization of nitrogen and the increase of soil organic matter, improving soil texture and preventing soil erosion due to its strong root system. Lack of sufficient knowledge of this species and the relationship between soil and environmental factors and its vegetation status, is a serious obstacle to its use for biological regeneration of degraded rangelands and planning for optimal management of existing habitats. Therefore, in this study, using the generalized incremental model, the response pattern of species to the slope of soil and topographic factors in its habitats in Hormozgan province was determined.
Materials and Methods: This study was conducted in three regions of Siahoo, Ahmadi and Bashagard of Hormozgan province. Siahoo region is located 55 km north of Bandar Abbas at an altitude of 450 meters above sea level, Ahmadi region is located 95 km north of Bandar Abbas at an altitude of 750 meters above sea level and Bashagard region is located 135 kilometers east of Bandar Abbas at an altitude of 600 meters above sea level. The average rainfall of Siahoo, Ahmadi and Bashagard study areas is 171.54, 183.61 and 193.18 mm, respectively. Their average annual temperatures are 27.34, 25.52 and 28.6 degrees Celsius. The average minimum and maximum absolute temperature in Siahoo region were 21.8 and 32.3 ° C, respectively, and were among the semi-humid hot regions. The minimum and maximum absolute temperature in Ahmadi region were 14.9 and 31.6 ° C, respectively, and among the regions. It is semi-dry hot. The average minimum and maximum absolute temperatures in Bashagard region are 21.1 and 33.9 degrees Celsius, respectively, and are among the hot dry regions. Sampling was performed by random-systematic method. A total of 30 plots in each ecological unit and a total of 90 plots were used for the three study areas. Then, the percentage of canopy cover of each species located inside the plots was measured. Also, a soil sample was taken from each plot for analysis. To investigate the relationship between effective and significant environmental variables and vegetation, conventional comparative analysis method was used as a nonlinear method. Forward selection was also used to reduce error. Significance of the relationship between species composition and axes obtained from environmental variables was investigated using the Monte Carlo permutation test. A generalized incremental model was used to predict the response of plant species to changes in environmental factors. In order to rank the variables affecting the performance of the species, the Akaic information criterion was used.
Results: The results showed that the soil texture in all three habitats was sandy loam. The amount of electrical conductivity in the three habitats showed a significant difference. Soil acidity was also higher in Bashagard region than the other two regions. The highest amount of soil lime was in Siahoo region with 54.3% and the lowest was in Ahmadi region with 19.3%. With increasing soil clay percentage, species response was decreasing and species presence was reduced. With increasing soil acidity to 7.5%, the species response was increasing and after that with increasing soil acidity to 7.7%, the presence of species decreased and again with increasing soil acidity, the presence and growth of species increased. With increasing the amount of soil lime to 55, the species response was increasing and since then with increasing soil lime, the presence of the species decreased. As the percentage of soil organic carbon increased, the species response was increasing and the presence of species increased. With increasing soil nitrogen percentage, species response was increasing and species presence increased. With increasing the percentage of uncovered soil (bare soil) to 55, the species response was increasing and since then with increasing bare soil, the presence of species decreased.
Discussion and Conclusion: The results of conventional adaptive classification showed that seven factors: percentage of neutralizing material, altitude, percentage of bare soil), electrical conductivity, soil saturation, litter percentage and soil silt percentage are the main factors influencing Are the distribution of species. Applying the generalized collective model with Poisson error distribution for each of the environmental variables, showed that the variables of soil lime percentage, clay percentage, acidity, soil organic carbon content, soil nitrogen and bare soil percentage at the level of 0.05% on species yield, They are meaningful. The relationship between the presence and yield of Lati plant as a valuable rangeland species in forage production and soil and water conservation was determined by environmental factors. In order to rehabilitate the degraded rangeland areas that have the conditions for the establishment of this species, it should be planted based on its ecological needs based on the obtained results, in order to have the best yield for the establishment of the species. At the same time, proper and optimal use of species in rangeland and in suitable habitats also reduces the loss of capital and time.
Type of Study: Research | Subject: Range Management
Received: 2021/05/27 | Accepted: 2021/09/7

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