Dynamics of mortmass ash content and migration of elements in different moisture conditions of mid-mountain tropical forests of Central Vietnam
Ya.O. LEBEDEV1,2,3, R.V. GORBUNOV4,2,3, T.Yu. GORBUNOVA4,2,3,5, A.V. DRYGVAL1,2,3, A.N. KUZNETSOV2,3, S.P. KUZNETSOVA2,3, VAN THINH NGUYEN2, N.I. BOBKO4, S.V. KAPRANOV4
1Moscow Representative Office, A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, Moscow, Russia
2Joint Russian-Vietnamese Tropical Research and Technology Center, Hanoi, Vietnam
3A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia
4A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences, Sevastopol, Russia
5Рeoples’ Friendship University of Russia (RUDN University), Moscow, Russia
Keywords: twigs and leaves debris, ash content, geochemical migration, heavy metals, geochemical catena
Abstract
The paper presents the study’s results of ash content of twigs and leaves debris from forest plants of primary mid-mountain tropical forests of Сentral Vietnam (Bidoup Nui Ba National Park) in order to identify and clarify the elements that enter the soil during their decomposition. A difference in the ratio of twigs and leaves debris in mortmass samples collected in different landscape conditions is shown. At the same time, the influence of periodical and stagnant moisture conditions on the conduct of migratory soil processes is considered. The sampling points of the twigs and leaves debris correspond to the locations of the soil catena within the structural ridge, its top, slope and foothill. This allows us to relate the results obtained on the elemental composition of the twigs and leaves debris to the geochemical migration of chemical elements in different geochemical landscape conditions, from automorphic to accumulative. An attempt has been made to establish the volumes of matter migrating from the mortmass into the soil together with the aqueous solution. Differences in the accumulation of ash elements in the twigs and leaves debris depending on the position in different landscape conditions are revealed. The composition of elements entering the soil with twigs and leaves debris and involved in geochemical migration is established, and the contribution of leaves and twigs debris to the accumulation and migration of elements under different moisture conditions is evaluated. A dependence of geochemical migration processes on the position of the elementary geochemical landscape facies in the catena is pointed out, which manifests itself in a change not only in the total ash content of the twigs and leaves debris, but also in the ratio of ash content of twigs debris to that of leaves debris.
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