Ghader Karimi; Hasan Yeganeh; Hasan Barati; Farhang Ghasriani
Abstract
Due to the growing trend of rangelands degradation, study effects of different harvesting intensities on species in order to gain a more fundamental utilization of ranglands can be effective for reclamation and improvement. The purpose of this research was to study effects of different harvesting intensities ...
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Due to the growing trend of rangelands degradation, study effects of different harvesting intensities on species in order to gain a more fundamental utilization of ranglands can be effective for reclamation and improvement. The purpose of this research was to study effects of different harvesting intensities on key species Ajuga chamaecistus.This species has a forage value in the study area. In this first region and a key area of one hectare in area Kordan and in the first year and was grazed, and fencing. Selected and removed from any of 0, 25, 50, 75% and control is exercised (a basic 10 treatments). Monthly by the clipper and the area is grazing season. Effect of harvest was study with the changes in the characteristics the species treated, including; forage and seed production, vitality, mortality and growth of shoots. Finally, production data the combined analysis of data with a split plot design and seed production, vitality, mortality and growth of shoots data in SAS software was analysed. Results of studies of the effects on forage production and harvest of Ajuga chamaecistus species showed the effect of different levels, different years, and their interactions on the production level is a significant percentage. This shows that in different years with different weather conditions of production are different. Also results of the analysis data showed seed production, vitality, mortality and growth of shoots are affected different levels of harvest and weather conditions. In general according to results indicated the negative effects harvesting at the level 75% was observed. In other words, heavy grazing has a negative impact on the species treated. So harvesting up 75% endangering the survival of these species and in fact, harvesting 50 percent it is not a serious problem.
Salahudin Zahedi; Farhang Ghasriani; Mina Bayat
Abstract
To study the effect of different harvesting intensity on forage production of Bromus tomentellus was considered of Majid Abad Qorveh. Treatments included four harvested intensity 25, 50 and 75 percent and control (no harvest).Data were analyzed based on splitplot over time during four years(1386-1389) ...
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To study the effect of different harvesting intensity on forage production of Bromus tomentellus was considered of Majid Abad Qorveh. Treatments included four harvested intensity 25, 50 and 75 percent and control (no harvest).Data were analyzed based on splitplot over time during four years(1386-1389) using SAS and IRRISTAT software. The results showed that the main effect of year, different harvesting intensity and interactions effect of different harvesting intensity and years are significant on forage production and vitality of Bromus tomentellus. Comparing the harvesting intensity of 50 and 25 percent indicated no significant difference between them. The highest intensity of production is harvest intensity of 25 percent with 390 mm perecipition in 1389 and the lowest harvest intensity is 50 and 75 percent with170 mm perecipition in 1387. Regarding to AMMI Analysis, the first interaction principal component(IPC1) had a significant effect and express a 93/6 percent of the interaction of the sum of squares. The first main component biplot interaction showed that the 25 percent treatments had a highest average production and stability is relatively good, control treatment had a lowest stability and 75 percent treatment had a highest stability. According to the results, to preserve the production and vitality of Bromus tomentellus the harvesting intensity of 25 percent is recommended.
Mohammad Sharifi Yazdi; Farhang Ghasriani; Mina Bayat
Abstract
The present research was done in steppic rangelands of Dehno, Kerman province to study theeffects of different harvesting intensities of Artemisia sieberi applying simulation method. Theexperiment was conducted using split plots in a completely randomized experimental designof ten replications to find ...
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The present research was done in steppic rangelands of Dehno, Kerman province to study theeffects of different harvesting intensities of Artemisia sieberi applying simulation method. Theexperiment was conducted using split plots in a completely randomized experimental designof ten replications to find the best grazing intensity. Treatments are including no harvest (as acontrol), 25, 50 and 75% harvest. In each treatment, 10 similar and average plant species wereselected as replications. All dependent variables were evaluated during the study and resultswere analyzed in SAS software. Results showed Minimum and maximum forage productionwas obtained at 25% harvest in 2008 and no harvest treatment in 2009, respectively. Regardingto the obtained results and soil condition, the 50% harvesting intensity is recommended inDehno site to maintain the vigority of Artemisia sieberi that is not dangerous for its survival,healthiness and vigority even in drought conditions.