The
influence of nitrogen fertilizing on carbon accumulation and decomposition in
arable soils of different fertility – gray forest soil and chernozem was
investigated in greenhouse experiment with corn. Growing of plants without N application on rich chernozem favored
the considerable (about 1% of ะกorg) C
growth, and on poor gray forest soil contributed to C decrease. Soil organic
matter (SOM) decomposition in both soils under unfertilized plants was the
same. N usage on gray forest soil resulted in increase of C accumulation due to
the substantial increase of C input with roots of fertilized plants and as organic matter active phase of this soil was stable
against decomposition under N. N application on chernozem in reverse
significantly increased SOM decomposition and affected plant productivity to a
lesser degree. Thus, N fertilizing favors C sink in arable soils of low
fertility and can reduce soil C
accumulation in arable soils of high fertility.
Author: A.S. Tulina, T.V. Kuznetsova, and V.M. Semenov (tulina at issp dot psn dot ru)
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