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
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.
Valiollah Raufirad; Ataollah Ebrahimi; Hossein Arzani; Zahra Shojaei Asadeiye
Abstract
Palatability includes plants physical and chemical property that encourages an animal selecta plant for grazing. This study is an attempt for intruducing an indicator for determining thepalatability of rangeland plants. To do this, the relationship between palatability and foragequality of rangeland ...
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Palatability includes plants physical and chemical property that encourages an animal selecta plant for grazing. This study is an attempt for intruducing an indicator for determining thepalatability of rangeland plants. To do this, the relationship between palatability and foragequality of rangeland plants in Karsanak rangelands of the Chaharmahal-va-Bakhtiari provincewas studied. First, plant composition based on plant canopy cover and production wasdetermined using of the systematic random sampling method (in each plant type there are2 transects of 200 m and 15 plots along each transect). Also, the percentage of present eachplant in the livestock diet (sheep and goat) was determined using the filming method. Then,the selection index of each plant species by sheep and goat was determined. In the next stage,the forage quality of some plant species was determined by determining the percentage ofCP, ADF, DMD and ME. Finally, the relationship between plant quality indices (independentvariables) and the selection index of plant species by sheep and goats (dependent variable)was determined using the SPSS software (Ver.15). Results showed that there is a significantrelationship between the selection index of each species (both percentage canopy cover andproduction) and ADF, DMD, and ME by the sheep (P ≤0.05). However, such a significantrelationship was not found for CP. And, there is not a significant relationship between theselection index of each species (both percentage canopy cover and production) and ADF,DMD, ME and CP by the goat (P ≤0.05). Considering the results, the quality of forage can be an indicator in determining their palatability.
Ebrahim Gavili; Mohammadreza Vahhabi; Fazel Amiri; Shiva Rashidi
Abstract
For planning the grazing of rangeland according to difference in body weight and different energy requirements should determine forage requirement of animal unit. In the other hand, daily need of animal in rangeland depends on the quantity and quality of intake forage composition. For this purpose selected ...
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For planning the grazing of rangeland according to difference in body weight and different energy requirements should determine forage requirement of animal unit. In the other hand, daily need of animal in rangeland depends on the quantity and quality of intake forage composition. For this purpose selected part of the rangeland of Fereidunshahr in Isfahan province was classified to vegetation types. In each type of all plant species about 500 grams at flowering stage were collected. Nitrogen (N) and acid detergent fiber (ADF) were measured through chemical analysis. Crude protein, ADF, dry matter digestibility and metabolizable energy either 3 replicates were assessed in the laboratory as indicators of forage quality. The Lori sheep race is user dominant Animal unit. In order to determine the animal unit body weight, from 3 existing herds within 11 unit management with dominant Animal from this race, 10 three and 10 four Dry adult ewes(main structure of the herd), 5 three and 5 four years old rams and 6 month old lambs randomly selected and were weighed in two period. Weighing operation performance once before grazing beginning (first may) and once after the end of grazing season (first September). In conclusion 45 kg body weight as animal unit was calculated and livestock rations of animal requirement in maintenance condition and grazing in rangeland (0.7 times of keeping in a stable) calculated using the MAFF equation. The result showed that animal requirement based on forage quality at flowering stage was 1.09 kg that for grazing session (30% reduction of forage quality) is 1/58 kg in day. Because there are difference in structure of vegetation types and metabolism energy so a permanent quantity of dry forage cannot specify as basic of computation the daily need