Esfandiar Jahantab; Maryam Zahedifar; Mohsen Farzin
Abstract
Study of important soil properties and vegetation attributes can give us awareness of the potential of rangelands and make it possible to determine their condition. O In this regard, the present study was carried out with the aim of studying the structural and functional attributes of different growth ...
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Study of important soil properties and vegetation attributes can give us awareness of the potential of rangelands and make it possible to determine their condition. O In this regard, the present study was carried out with the aim of studying the structural and functional attributes of different growth forms on soil surface indices in the Mianjangal Catchment, Fasa. Eleven soil surface indicators were measured along three 100-meter transects using Landscape Function Analysis. The measured factors were classified to assess functional potentials (stability, infiltration, nutrient cycle). Structural attributes including number of patches, length and width of patches, the percentage of patch length to the transect length, patch area index and organization index were investigated. In general, four ecological patches including shrub, bush, grass and forb and the space between the patches (bare and litter) were identified in the study area. The organization index of patch area index were 0.41 and 0.03 in the study area respectively. The results showed that plant patches with different growth forms had different effects on ecosystem function. The growth form shrub had the highest stability, which had a significant difference with other growth forms. In terms of infiltration index in the study area, there were no significant differences between ecological patches with shrub and grass growth forms. Soil nutrient cycle also had a significant difference between ecological patches and also inter-patches. The shrub growth form had the highest amount of nutrient cycle.
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.
GH.A Heshmati; M S. Azimi; P Ashouri
Volume 63, Issue 3 , December 2010, , Pages 319-329
Abstract
Rangeland ecosystem contains various patches with different functions. Structural and functional characteristics of rangeland patches are changed by management practices and can be used to interpret management effects. The structural and functional characteristics of fertilized patches in two rangeland ...
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Rangeland ecosystem contains various patches with different functions. Structural and functional characteristics of rangeland patches are changed by management practices and can be used to interpret management effects. The structural and functional characteristics of fertilized patches in two rangeland ecosystems of Ghareh Ghir and Maraveh Tapeh were measured and analyzed in this study. A group of measurable and simple indices of landscape function analysis (LFA) methods were used to evaluate these characteristics. Five structural characteristics such as: the number of patches, total patch area, patch area index, landscape organization index and inter patch length mean on the east and western aspects of Ghareh Ghir and Maraveh Tapeh were measured. On the basis of statistical analysis, the structural characteristics of patches in the east and western aspects of the two areas (Ghareh Ghir and Maraveh Tapeh) were highly significant (P
