جستجوی مقالات مرتبط با کلیدواژه « پیتینگ » در نشریات گروه « آبخیزداری، بیابان، محیط زیست، مرتع »

Proper siting of rainwater conservation systems is an important step to ensure water supply in a watershed. The present study was carried out to identify the factors involved in rainwater infiltration and storage and to determine suitable locations for the construction of rainwater conservation systems in Nazluchai Basin, Urmia. For this purpose, slope, rainfall, land use, soil texture, and soil depth were selected as the parameters affecting rainwater storage and subsequently subjected to AHP analysis in order to determine the weight of each in the different improvement operations studied. In a second step, the TOPSIS model was used to prioritize the sub-basins with regard to the improvement operations of pitting, contour trenching, terracing, and contour furrowing. Based on the results, pitting was found superior to the other improvement operations in the study area as evidenced by the Ci values of 0.94, 0.28, 0.20, 0.31, 0.08, 0.02, and 0.01% obtained from the TOPSIS model for pitting in sub-basins 1 to 7, respectively, indicating the higher priority of sub-basin 1 for performing the pitting improvement operation. According to the same results, sub-basins 3, 2, and 4 were identified as the priority ones for contour trenching, terracing, and contour furrowing, respectively. It was found that while the costly rainwater harvesting schemes cannot be economically justified for the study area, the alternative rainwater conservation schemes may be of priority on economic grounds.  A final finding of the study indicated that not only the criteria but also the combined AHP-TOPSIS model used in this study may help state executive departments to select appropriate improvement operations in other watersheds.

Rainfall storage with plant species planting is used for rehabilitation and improvement of rangelands, especially in arid areas. In this study the effect of rainfall storage treatments furrow, pitting and crescent pond on the establishment of Ferula tabasensis in Kalmand Bahadoran area of Yazd province was evaluated. This area is one of the habitats of the species studied. Seeds were planted at two season, early fall as autumn sowing and late winter as spring sowing. The research was a split plot design, based on randomized complete blocks with three replications. The main plot was planting time (spring and autumn) and sub plot was planting method (farrow, pitting and crescent pond). The seeds were planted in 2013 and 2014. The results showed that seed emergence rate in autumn were significantly higher than spring planting. Among the planting methods, the impact of the crescent pond method was slightly more than the other two methods. In general, planting methods caused more than 50% seed emergence. Although some of these seedlings were destroyed for various reasons, however, the establishment of about 30% of seedlings shows that the methods of rainwater harvesting in the establishment of cultivated plants have had a positive effect.