Studies of the influence of soil biogenic acidity on podzol formation
The paper with a review and generalization of data analysis on the principal forms of soil biogenic acidity is based on research into representative podzols and podzoluvisols with combined parent materials and boreal (taiga) ecosystems at the Central Forest Biosphere Reserve (CFBR) (Tver region), Fo...
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| Format: | Text |
| Language: | unknown |
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Федеральное государственное бюджетное образовательное учреждение высшего образования «Российский государственный аграрный университет – МСХА им. К.А. Тимирязева»
2013
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| Online Access: | http://cyberleninka.ru/article/n/studies-of-the-influence-of-soil-biogenic-acidity-on-podzol-formation http://cyberleninka.ru/article_covers/15324340.png |
| Summary: | The paper with a review and generalization of data analysis on the principal forms of soil biogenic acidity is based on research into representative podzols and podzoluvisols with combined parent materials and boreal (taiga) ecosystems at the Central Forest Biosphere Reserve (CFBR) (Tver region), Forest Experimental Station of RSAU (FES) (Moscow) and LAMP Experimental plot in Taiga park of Petrozavodsk. Long-term monitoring of acidity forms was performed by the authors during 2002-2012. Two principal approaches — chemical and soil-ecological — of soil acidity nature can be used in soil acidity studies. The former is to be applied when soils of agricultural ecosystems that determine their acidity regulation methods through liming are studied. Soil-ecological assessment is associated with the diagnosis of biogenic acidity of taiga ecosystems and includes biochemical cycling of organic carbon formed during photosynthetic process and humification of organic acids with low molecular weight, polyphenols and fulvic acids. The quantitative evaluation of the biogenic acidity was made through the study of migration of water soluble organic substances (WOS) with acidic properties. The sorption lysimeter method (SLM) was used in this research. The highest values of hydrolytic acidity and active acidity were fixed in sod-podzoluvisols in larch and pine mature plantations at the Forest Experimental Station, in mature spruce forest at the Central Forest Biosphere Reserve and in podzols at the LAMP Experimental plot in Taiga park of Petrozavodsk. The above is strongly related with lysimeter data on mobilization of WOS with acidic properties and fulvic acids in solution. Al and Fe compounds leaching from topsoil were observed after considerable Ca and Mg depletion from dominating minerals. The process of surface gleization of sod-podzoluvisols is connected with their inter-profile gleization at the parent material boundary and activates the lateral removal of Са 2+, Mg 2+, Fe 3+, Al 3+ ions with the participation of WOS. As to sod-podzoluvisols of FES, WOS outflow from the upper horizon A 0 can be up to 24 g/m 2 C org in autumn (one of principal migration peaks), and from the A 0t horizon of the Petrozavodsky permanent plot 16-21 g/ m 2. |
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