C - Lublin

Biomass of shoot oat (from TH to parent rock decreased from 100 up to 22 on
the control and to 8 % on polluted substrate) and roots (from 100 to 24 and 28 %
accordingly) reacted even more sharply to composition and properties of substrate.
The influence of Pb (NO 3 ) 2 had various effects on shoot oat biomass being greater
on polluted substrates than on control ones, the root biomass in all the variants with
lead (except for TH + sand 1: 1) was 56 - 85 % from those on the control (Fig.4).
16
14
12
10
8
6
4
2
0
Gr
K
Pb
1ŕ 2ŕ 3ŕ 4ŕ 5ŕ 6ŕ
A
Gr
1,2
1,0
0,8
0,6
0,4
0,2
0,0
K
Pb
1ŕ 2ŕ 3ŕ 4ŕ 5ŕ 6ŕ
Fig. 4. Shoot(А) and root(В) biomass.
The results of experiment of soil conditions modeling testify to complex
influence properties of soil and concentration of metal -pollutant on growth and
development of plants. Presence pollutant and its concentration right at the
beginning of oat vegetation caused the most negative influence on plants. In the
further most essential distinctions in growth and biomass were shown as a result of
influence of composition and physico-chemical properties of soil - the humus
contents, exchange capacity, рН and other factors.
CONCLUSION
As a whole, analyzing obtained by us and literary data it is possible to make
conclusions, that nitric lead produced dual influence on morphometric parameters
of oat plants: contained in salt nitrate nitrogen facilitates growth processes, and
lead cations in the doses exceeding 2000 mg/kg soil inhibit them. Rather low doses
Pb (up to 1000 mg/kg soil) fail not only negative influence on development of
plants owing to high buffer capacity soils in relation to HМ, but even in a number
of cases stimulate their development. According to sensitivity to Pb(NO 3 ) 2
influence morphometric parameters form: height of plants < shoot biomass < roots
biomass < brunching. Collateral action on development of oat plants render also
Са 2+ cations, added soil with Ca (NO 3 ) 2 in order to balance nitrate background.
This action as a whole has the same Pb 2+ cation orientation, as it should be taken
into account when using nitrogen metal salts in pot experiments.
Study supported by the Russian Foundation for Basic Research (project no. 02-04-48970).
49
B