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The objective of this project was to use detailed soil profi le descriptions and soil carbon analyses to determine the soil C sequestration potential of tree planting across climatic gradients in the U.S. Great Plains. Tree windbreak age ranged from 19 to 70 years and age of cultivation from 22 to ~110 years. At each site, soil pits were prepared within the tree planting, the adjacent crop fi elds, and nearby undisturbed grassland. Windbreak soils had consistently thicker soil organic carbon (SOC)-enriched A or A+AB horizons when compared to the crop fi elds. The thickness of A or A+AB horizons in the windbreak soils were comparable to the undisturbed grassland soils. A linear relationship was detected between the difference in A+AB thickness of soils beneath windbreaks and undisturbed grasslands and a climate index (hydrothermal coeffi cient, HTC). These results indicate that tree windbreaks with more cool and moist climate conditions are more favorable for SOC accumulation in the surface soil. The relationship between SOC accumulation and climate factors enables the estimation of soil carbon stocks in existing windbreaks and the prediction of potential carbon sequestration of future plantings. Abstract The objective of this project was to use detailed soil profi le descriptions and soil carbon analyses to determine the soil C sequestration potential of tree planting across climatic gradients in the U.S. Great Plains. Tree windbreak age ranged from 19 to 70 years and age of cultivation from 22 to ~110 years. At each site, soil pits were prepared within the tree planting, the adjacent crop fi elds, and nearby undisturbed grassland. Windbreak soils had consistently thicker soil organic carbon (SOC)-enriched A or A+AB horizons when compared to the crop fi elds. The thickness of A or A+AB horizons in the windbreak soils were comparable to the undisturbed grassland soils. A linear relationship was detected between the difference in A+AB thickness of soils beneath windbreaks and undisturbed grasslands and a climate index (hydrothermal coeffi cient, HTC). These results indicate that tree windbreaks with more cool and moist climate conditions are more favorable for SOC accumulation in the surface soil. The relationship between SOC accumulation and climate factors enables the estimation of soil carbon stocks in existing windbreaks and the prediction of potential carbon sequestration of future plantings.

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The dtstnbuluxi o f manganese and anc m virgin and arable chernozems located near technogenic objects o f the mining enterprise was analysed Soil sampling was earned out from soil sections The analysis o f soil elemental composition was carried out by xray fluorescence method MathemaUcal processing o f the results included the use o f flandud software packages for statistical calculations h was ascertained that /л belongs to die dements o f concentration and Mn-to the elements o f the dispersion Exceeding* in relation to the maximum permissible or approximate permissible concentration» were not detected, but the concentration o f manganese was above the background The coefficients o f radial differentiation ui the upper horizons of sotls for a ttc are higher than for manganese and they are higher on virgin land than on arable Concentration-, o f the studied elements in the upper layers o f soils are weakly connected with the impact o f dumps and tailings The acid-basic property o f soils is the significant factor influencing the distribution o f the studied elements. Humus content and the amount o f silt in soils hav e the weak influence