Distribution of Humus Substances between Clay Particles of Different Peptization Level in the Meadow Soils of the Middle Priamurje, Russia
Soil clay (particles<2 μm) was sequentially divided into water peptizable (WPC) and aggregated (AC) sub-fractions according to their ability to peptizate in water.The content of hurnic acids (HA),fulvic acids (FA)and humins was estimated in both sub-fractions.The studied soil was the meadow podbel (planosol in the FAO system),periodically over-moistured with atmosphere precipitation.The soil profile revealed well-marked genetic horizons.Specifics of the quantitative content of WPC and AC in the major horizons of this soil were determined.All fractions of HA and FA are present in WPC in small quantities.The most amounts of humus substances were associated with AC,and sometimes with a non-peptizated soil residual (sum of particles>2 μm).The results of the revaluation of data of group and fraction composition of humus in WPC and AC considering the content of WPC and AC in soil showed that over 70% of total content of I fraction of HA and FA are concentrated in AC of the humus horizon.This indicates its defining role in organomineral interactions and processes of soil material aggregation in the humus horizon of the meadow podbel.
Aggregated clay Water peptizated clay Humic acids Meadow podbel Fulvic acids Non-silicate iron
L.A.Matiushkina
Institute of Water and Ecology Problems,Far Eastern Branch,Russian Academy of Sciences,65 Kim Yu Chen St.,680000 Khabarovsk,Russia
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
147-149
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）