The relationship between soil macro elements and phytonutrients in the Moghan to Sabalan rangelands

Shekastehband, Fatemeh (2018) The relationship between soil macro elements and phytonutrients in the Moghan to Sabalan rangelands. Masters thesis, university of Mohaghegh Ardabili.

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Text (بررسی رابطه بین عناصر پرمصرف خاک و مواد معدنی گیاهان در مراتع مغان تا سبلان) Fatemeh Shekastehband.pdf Download (469kB) | Preview

Abstract

The density of mineral elements in soil is effective on the absorption of these elements by the plant and the yield of the plants. Due to the importance of these elements, especially macro-elements in the soil, it is necessary to study them. The purpose of this study was to investigate relationship between soil macro-elements including calcium, potassium, sodium, phosphorus and nitrogen with phytonutrients. Thus, sampling of soil and plant in thirteen sites was carried out in the elevation gradient of Moghan to Sabalan. In each site were placed three transects of 100 meters with 50 meters from each other. along each transect were placed five plots of 1m2. In Each plot, forb, grass and shrub was harvested separately. Soil samples were taken at topsoil (0 to 15 cm) and subsoil (15 to 30 cm). macro-elements including nitrogen, phosphorus, potassium, sodium and calcium were measured for plant and soil samples. Then, density of macro-elements in vegetation and soils compared in different elevation classes. Also, relationship between macro-elements in soil and plant investigate. Correlation analysis was used to investigate the effect of elevation on relationship between soil and vegetation elements. Finally, the amount of macro-elaments in the plant was compared with the density of livestock needed for these macro-elements. The results showed that the density of soil macro-elements is different in elevation classes. The maximum density of nitrogen in soil was at 3000-3300 m (0.47%), phosphorus 1200-1500 m (87.8 ppm), potassium 3000-3300 m (57.6 ppm), sodium 3000-3300 m (69/8 ppm) and calcium 3000-3300 m (16.53 meq / L). Also, The results showed that the density of plant macro-elements is different in elevation classes. maximum amount of nitrogen in shrub was at 2100-2400 m (3.06%), phosphorus in forb 3000-3300 m (548/2 ppm), potassium in forb 600-900 m (400.3 ppm), sodium in shrub 300-600 m (58/58 ppm) and calcium in forb 300-0 m (266 ppm). Based on the results, thers was not relationship between macro-elements in soil and plants. Also, elevation was affect on the relationship between macro-element in soil and plants. Thus, another factor was affect on the relationship between macro-element in soil and plant. The amount of nitrogen in the summer, winter and middle Rangeland was more than the amount of livestock needed, while amount of phosphorus, potassium, calcium and sodium in all areas is less than the amount of livestock needed.

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