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Effect of crop growth on the distribution and mineralization of soil sulfur fractions in the rhizosphere
Author(s) -
Hu Zhengyi,
Yang Zhihui,
Xu Chengkai,
Haneklaus Silvia,
Cao Zhihong,
Schnug Ewald
Publication year - 2002
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200206)165:3<249::aid-jpln1111249>3.0.co;2-n
Subject(s) - rhizosphere , mineralization (soil science) , chemistry , agronomy , bulk soil , soil water , botany , nitrogen , biology , soil science , environmental science , organic chemistry , bacteria , genetics
The effect of plant growth on the mineralization of organic matter and distribution of soil S fractions (plant available SO 4 2— , adsorbed SO 4 2— , carbon‐bonded S, ester‐bonded S, and residual‐S) in the rhizosphere was studied in a greenhouse experiment using a rhizobag technique. In this study wheat, oilseed rape and radish were grown on two soils, a Haplic Acrisol and a Hortic Anthrosol. Significant differences between S fractions in the rhizosphere and non‐rhizosphere were determined in dependence on soil type and crop species. In all cropped treatments lower amounts of ester‐bonded S and higher levels of residual‐S were found in the rhizosphere than in the non‐rhizosphere, while the amount of carbon‐bonded S fractions was similar. These results indicate firstly, that the arylsulfatase activity was higher in the rhizosphere than in the non‐rhizosphere and secondly, that mass flow of SO 4 2— ‐S to the rhizosphere increased after mineralization of residual‐S. Compared to the non‐vegetated soil, the ester‐bonded S fraction of wheat and oilseed rape decreased in the rhizosphere revealing that the mineralization of organic S in the rhizosphere is related to the crop type.