The effect of pine climatypes on soil chemical propeties in the western Sayany Region of Russia

Kuznetsova G.V., Makarikova R., Naumova N.B., Kutsenogy K.P., Chankina O.V.

Institute soil science and agricultural chemistry Siberian branch (Novosibirsk)

 

In the long-term field provenance experiment in the Bolsherechensk Forestry of the Krasnoyarsk region (Russia) we studied soil chemical properties under  27-30–years old trees of various climatypes of Pinus sibirica L. (Krasnoyarsk, Kemerovo, Tomsk-Vasyugan, Tomsk-Shagara, Northern Enisey) and Pinus koraensis L. (Primorsky and Habarovsk).

Soil was sampled from the 0-20 cm layer at the 60 sm radii from the tree. Six individual soil monoliths were bulked together to produce one thoroughly mixed sample. Soil organic matter C and N were determined by wet digestion, pH and labile nutrients contents were measured by standardaized agrochemical techniques, whereas soil elemental composition  (Ê,Ca, Ti, V, Cr, Mn, Fe, Zn, Cu, Co, Ni, Pb, Sr, Ga, As, Br, Ru, Y, Zr, Nb, Mo) was measured by X-ray fluorescence analysis with synchrotron radiation. Microbial biomass C, N and P contents were estimated by fumigation-extraction method. Averaged over all the plots, the soil had the pH slightly above 7 and rather low content of labile nutrients’ content.

The obtained data were analyzed by principal components extraction and the structure of relationship between various climatypes analyzed visually by their location on the plane of the first two principal components, together accounting for 74% of the total original data variance. There were differences between Pinus sibirica L. climatypes both in the 1st and 2nd principal components, as well as between the two climatypes Latin name along the 1st principal component. The soil sample from under Habarovsk climatypes of the latter was located far aside from all the other samples, mostly due to total and nitrate N contents and total ash.

The obtained results allow us to draw a conclusion that the intra-species heterogeneity of both studied tree species in their physiological and growth characteristics determine the differences in macro- and micro-nutrients and other elements uptake/ input from/into the soil, thus resulting in differing soil properties. These peculiarities of soil nitrogen, metals and other elements, especially Y, As, Br, transformation can be used for biogeochemical selection, and need further investigation.

Note. Abstracts are published in author's edition