G. F. Koposov, A. A. Valeeva
Kazan Federal University, Kazan, 420008, Kremlyovskaya st. 18, Russia
The authors generalized and summarized original and literature data with the view of studying the gray and dark-gray soils in the Volga-Kama forest steppe. The methods of multidimensional statistics permitted to determine the position of these soils in the available soil classification system. A great number of soils described by different researchers within the framework of Russian soil classification system (1977) were formalized in conformity with that published in 2004. In the latest classification system of soils in Russia the reliable differences in the humus horizon of gray and dark-gray soils are shown in the content of humus, exchangeable bases, clay fraction, acidity and thickness as well as in the thickness of the leached layer (up to the C horizon) and the humus storage within the one meter of soil (t/ha). The methods of numerical classification allowed determining discriminated functions and classify more exactly the studied soils in the Volga-Kama forest steppe. Based upon statistic processing of the obtained data the limits for properties of the humus horizon are suggested to distinguish the gray and dark-gray soils. The visual imagination widely adopted now to recognize the types of gray and dark-gray soils should be added by limits of their varying properties. The obtained results presented in this paper may be useful to improve the idea on properties of gray forest soils. The suggested criteria to recognize the studied soils may be applicable for studying and systematizing these soils as well as for purposes of land use, elaboration of regional database and in projects of ecological territory optimization.
Keywords: gray soils, dark-gray soils, numerical classification, systematization.
REFERENCES
1. Aleksandrova A.B., Berezhnaya N.A., Grigor'yan B.R., Ivanov D.V., Kulagina V.I. Krasnaya kniga pochv Respubliki Tatarstan, Kazan', 2012, 192 p.
2. Artem'eva Z.S. Organicheskoe veshchestvo i granulometricheskaya sistema pochvy, Moscow, 2010, 240 p.
3. Akhtyrtsev B.P. O genezise serykh lesnykh pochv, Pochvovedenie, 1979, No 10, pp. 24–33.
4. Vanyushina A.Ya., Travnikova L.S. Organo-mineral'nye vzaimodeistviya v pochvakh (obzor literatury), Pochvovedenie, 2003, No 4, pp. 418–428.
5. Vinokurov M.A., Grishin P.V. Lesnye pochvy Tatarii, Kazan', 1962, 69 p.
6. Gazizullin A.Kh. Pochvenno-ekologicheskie usloviya formirovanie lesov srednego Povolzh'ya: Pochvy lesov Srednego Povolzh'ya, ikh genezis, sistematika i lesorastitel'nye svoistva, Kazan', 2005, 496 p.
7. Gennadiev A.N., Glazovskaya M.A. Geografiya pochv s osnovami pochvovede-niya, Moscow, 2005, 460 p.
8. Glinka K.D. Pochvovedenie, Moscow–Leningrad, 1932, 596 p.
9. Zakharov K.K. Pochvy lesov Chuvashii i puti ikh ratsional'nogoispol'zo-vaniya: Doctor’s thesis, Kazan', 2004, 385 p.
10. Zakharov K.K. Pochvy nagornykh dubrav Chuvashskoi ASSR, puti ikhuluch-sheniya i povysheniya produktivnosti proizrastayushchikh na nikh lesov: Candidate’s thesis , Ioshkar-Ola, 1974, 171 p.
11. Zonn S.V. Burozemoobrazovanie, psevdoopodzolivanie i podzoloobrazovanie, Pochvovedenie, 1966, No 7, pp. 5–13.
12. Ivanova E.I. Pochvy shirokolistvennykh i khvoino-shirokolistvennykh lesov Mariiskoi ASSR i meropriyatiya po ikh uluchsheniyu: Candidate’s thesis, Ioshkar-Ola, 1968, 318 p.
13. Kershens M. Znachenie soderzhanie gumusa dlya plodorodiya pochv I krugo-vorota azota, Pochvovedenie, 1992, No 10, pp. 122–132.
14. Kornilova A.G., Shinkarev A.A., Lygina T.Z., Giniyatullin K.G. Diagnostika litologicheskoi odnorodnosti pochvennogo profilya po indeksnym elementam, Kazan', 2010, 28 p.
15. Ponomareva V.V. Teoriya podzoloobrazovatel'nogo protsessa, Moscow–Leningrad, 1964, 378 p.
16. Rozhkov V.A. Klassiologiya i klassifikatsiya pochv, Pochvovedenie, 2012, No 3, pp. 259–269.
17. Rozhkov V.A. Pochvennaya informatika, Moscow, 1989, 222 p.
18. Rozhkov V.A. Formal Apparatus of Soil Classification, Eurasian Soil Science, 2011, Vol. 44 (12), pp. 1289–1303. DOI: 10.1134/S1064229311120106.
19. Rozanov B.G. Morfologiya pochv, Moscow, 2004. 432 p.
20. Tursina T.V. Approaches to the Study of the Lithological Homogeneity of Soil Profiles and Soil Polygenesis, Eurasian Soil Science, 2012, Vol. 45(5), pp. 475–487. DOI: 10.1134/S1064229312050146.
21. Tyurin I.V. K voprosu o genezise i klassifikatsii lesostepnykh i lesnykh pochv, Uchen. zap. Kazan. un-ta, 1930, T. 90, Kn. 3–4, pp. 429–462.
22. Tyurin I.V., Andreev S.I., Zemlyanitskii L.T., Shendrikov M.G. Pochvy Chu-vashskoi respubliki, Moscow–Leningrad, 1935, 329 p.
23. Shakirov K.Sh., Arslanov P.A. Pochvy shirokolistvennykh lesov Predvolzh'ya. Kazan', 1982. 175 p.
24. Beshay N.F., Sallam A.Sh. Evaluation of some methods for establishing uni-formity of profile parent materials, Arid Land Res. Manage, 1995, Vol. 9, pp. 63–72.
25. Busacca A.J., Busacca A.J., Singer M.J. Pedogenesis of a chronosequence in the Sacramento Valley, California, U.S.A., II. Elemental chemistry of silt fractions, Geoderma, 1989, Vol. 44, pp. 43–75.
26. Cabrera-Martinez F., Harris W.G., Carlisle V.W., Collins M.E. Evidence for clay translocation in Coastal Plain soils with sandy/loamy boundaries, Soil Sci. Soc. Am. J., 1989, Vol. 53, pp. 1108–1114.
27. Jenkinson D.S. Studies on the decomposition of plant material in soil J. Soil Sci., 1977, Vol. 17, pp. 280–302.
28. Kundler P. Zur Kenntnis der Rasenpodsole and Greuen Waldböden Mittelrusslands im Vergleich mit den Sols lessives des westlichen Europas, Z. Pflanzenernähr., Düng. Bodenkunde, 1959, Bd. 86, H. 1, pp. 16–36.
29. Martin R. Carter Soil Quality for Sustainable Land Management: Organic Matter and Aggregation Interactions that Maintain Soil Functions, Agronomy J., 2002, Vol. 94, pp. 38–47.
30. Stolt M.H., Baker J.C., Simpson T.W. Soil-landscape relationships in Virginia: I. Soil variability and parent material uniformity, Soil Sci. Soc. Am. J. 1993. Vol. 57. P. 414–421.
