zhila ghorbani; Kiumars Sefidi; Mahshid Souri; Mehdi Moameri
Volume 28, Issue 3 , October 2021, , Pages 395-409
Abstract
Awareness of the extent and impact of vegetation from livestock grazing disorders can be a solution to develop rangeland ecosystem management strategies to achieve sustainability and continuous production in these ecosystems. In this study, the production of aerial and underground organs of grazable ...
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Awareness of the extent and impact of vegetation from livestock grazing disorders can be a solution to develop rangeland ecosystem management strategies to achieve sustainability and continuous production in these ecosystems. In this study, the production of aerial and underground organs of grazable livestock species in the southeastern rangelands of Sabalan under the influence of different grazing intensities and distance from the village as the focus of the crisis was investigated. In addition, the development and evaluation of ANFIS model was presented in order to predict the production of aerial and underground organs of food species and compare the results with the regression model. For evaluation of regression and ANFIS models the Root Mean Square Error (RMSE) and correlation coefficient (R2) were used. The results showed that different grazing intensities, distance from village and interaction between them were significant effect on the production of aerial and underground organs of palatability species at (p≤0.01). Also, with increasing grazing intensity, the production of aerial and underground organs of these species decreased. The results of ANFIS section showed that in low grazing intensity and distance of about 400 meters, the highest amount of production of palatable species is observed. The lowest production of these species is predicted to be close to the village (200 meters). Moreover, the highest amount of underground biomass at farther distances (600 meter) and lowest amount of that was observed at 200 meter. In addition, ANFIS model with higher accuracy (R2 = 0.98 and R2 = 0.95) and lower error (RMSE = 0.9792 and RMSE = 1.168) than less accurate regression model (R2 = 0.92 and R2 0.77) which also had more errors (RMSE = 2.2835 and RMSE = 3.8954), predicted the production of aerial and underground organs, respectively.
zhila ghorbani; Kiomars Sefidi; farshad Keivan Behjou; Mehdi Moameri
Volume 25, Issue 3 , November 2018, , Pages 500-511
Abstract
This study was conducted to assess the effects of different grazing intensities on the biomass amount of Agropyron libanoticum and Festuca ovina in summer rangelands of southern Sabalan, Ardabil province. After determining three sampling areas as different livestock grazing treatments ...
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This study was conducted to assess the effects of different grazing intensities on the biomass amount of Agropyron libanoticum and Festuca ovina in summer rangelands of southern Sabalan, Ardabil province. After determining three sampling areas as different livestock grazing treatments (light, moderate, and heavy grazing), plant sampling was performed by a random-systematic method in 25 plots along 600-m transects. A linear regression was used to determine the relationship between aerial and underground biomass. To assess the effects of different grazing intensities on biomass of these species a one-way ANOVA and Tukey test were used. The results showed that there was a significant relationship between aerial and underground biomass of two species in different treatments. Moreover, increasing the livestock grazing intensity resulted in a significant decrease in the aerial and underground biomass and total biomass of both species. In addition, increasing grazing intensity leads to decreasing aerial biomass in moderate and heavy grazing treatments compared to the light grazing intensity (26.31% and 42.24, , for Festuca ovina, respectively, and 22.04% and 48.76% for Agropyron libanoticum, respectively. Increasing grazing intensity leads to decreasing underground biomass in moderate and heavy grazing treatments compared to the light grazing intensity (25.14% and 42.75 for Festuca ovina, respectively, and 9.39% and 35.30% for Agropyron libanoticum, respectively. Generally, grazing intensity reduced the aerial and underground biomass of Agropyron libanoticum and Festuca ovina.Therefore, grazing control in rangeland management is necessary to prevent the destruction of these species.