جستجوی مقالات مرتبط با کلیدواژه "soil cover" در نشریات گروه "آبخیزداری، بیابان، محیط زیست، مرتع"

This study was conducted to evaluate the ability of Sample Point software compared with Ocular estimation (O.E.) as a traditional method for estimating soil cover in Semi-steppe rangelands of Arjan area in the west part of Fars province. Estimation of soil cover attributes including canopy cover, litter, stone and bare soils were performed using ocular estimation (O.E.). Simultaneously, the digital images of each plot were obtained using a Canon camera with 8-megapixel quality installed 2 meters height above the sampling plots. Image processing was carried out in Sample Point software version 1.65. The times consumed in different parts of sampling process were also recorded. The results demonstrated that all the soil cover attributes in the two different methods (O.E. and S.P.) were significantly correlated (P≤0.01). The percentage of measured canopy cover, litter, stone cover and bare soil were not significantly different between the two sampling methods (P≤0.05). The time of field work and the overall time which spent in O.E. method was more than S.P. sampling approach. Nevertheless, the lab analysis time in S.P. method was greater than the O.E. method (p≤0.01). Generally; the result of this research indicated that digital imaging techniques can be used by Sample Point software to estimate soil cover appropriately. We therefore introduce and recommend this technique as a practical, easy, inexpensive and repeating method to evaluate the soil cover of Semi-steppe rangelands.

The fire is one of the factors that have effect on the natural cycle of ecosystem. This project was established to deal with the effect of the fire on quality features of habitat in the research site of rangelands plants of Zagheh Gorge.It was occur at Khoramabad northeast 35 Km with 33° 29" N, and 48° 42" E, being at 1960 meters above the sea level. This study was formed by travel method, We Used Transects 200 m and plots 1 m that chose vegetation type and plants morphology Both Control area and treatment in Comparison Conclusion show that there are difference significant between canopy cover in the control area, and the fire (p<0.01). Also, after two years, there are not difference significant between organic matter, litter, pebble and rock (p<0.01). But there are significant difference between Soil Conservation level inside and outside of the fire area (p<0.01).This Statistics show that there are difference between the plant production of Class I and III in the control area and the fire with 30.32 and 5.54 in control area and 24.84 and 2.72 gr/m2 in the fire area (p<0.01). The Control area with 69.32 Percent of Canopy Cover is better than the fire area with 51.6(p<0.01) so, high percent of Canopy cover in the Control treatment caused heap of crucibles and numerous branches in this area. Forbs plants, decreased from 46.8 % in the control Canopy Cover area to 35.6 % in the fire area; whereas, grasses increased from 53.2 percent in the control area to 64.4 percent in the fire area. So, the fire is effective on increase of grasses and decrease of forbs.