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2015, N 5 (21) |
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ECOLOGY |
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Аvilova A., Vasenev I., Bagina B. |
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Low-contrast mesorelief impact on heavy metals content and stocks in the background ecosystem basic components of the RTSAU Forest Experimental Station |
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There are results of the long-term investigation of the low-contrast mesorelief forms (moraine hilltop and it’s polar slopes) impact on heavy metals (Pb, Cu, Zn, Cd) content in the forest ecosystem basic components (soil, snow and plant cover) in the background environmental monitoring key sites of the RTSAU Forest Experimental Station with forest ecosystems which are representative for the northern part of Moscow megalopolises. They discovered the significant and annually reproducible spatial variability (due to mesorelief forms) of the investigated heavy metals background contents: from their minimum at the moraine hilltop to the maximum in the lower parts of its slopes with differences until 1,5-4 times. Maximum accumulation has been observed in the transit and accumulative mesorelief forms for all basic ecosystem components. There is comparable level of the mesorelief impact on the heavy metals content spatial variability and the man-made one. The spatial variety in the heavy metals topsoil stocks are increasing in the line: Pb < Cu < Zn < Cd – due to essential differences in their mobility. There is eluvial character of the cadmium mobile forms profile distribution with maximum in the textural-illuvial horizons of the investigated podzoluvisols. It should be noted the steady heavy metals accumulation trend since 2009 to 2014: the soil lead content has been increased in 1.6-3.4 times; copper – in 1,3-3,1 times, zinc – in 1,2-1,8 times and cadmium – in 1,7-11 times. The close direct correlation was defined between the heavy metals stocks in the spring snow and stable snow cover duration. It shows the relatively stable modules of the HM air input on the snow surface with the following lateral redistribution through the mesorelief forms.
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