Transformation of sulfate and organic S in rice straw in flooded paddy soils and its availability to plants using sulfur-35 labeling

文献类型： 外文期刊

第一作者： Zhou, W

作者： Zhou, W;Li, ST;He, P;Lin, B

作者机构：

关键词： S-35;sulfur fraction;transformation;availability;flooded paddy soil

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2006 年 132 卷 1-2 期

页码：

收录情况： SCI

摘要： Sulfur transformation and its availability to plants in two flooded paddy soils, derived from Black soil in Heilongjiang (soil 1) and from Red earth in Jiangxi (soil 2), were investigated in a closed incubation system using carrier-free S-35-SO42- and S-35-labeled rice straw. After incubation for 120 days, 51.1% and 60.3% of the S-35 added in the (Na2SO4)-S-35 treatment were found in the sulfate-S fraction 14.0% and 11.1% as sulfide-S, 5.2% and 5.3% as other non-sulfate inorganic S fraction (OI-S), 9.5% and 6.0% as C-O-S, 8.1% and 7.3% as C-bonded S, and 12.1% and 10.0% as non-reducible organic S fraction (NRO-S) for soil 1 and soil 2, respectively. Since soil Eh increased greatly after planting the rice, sulfide-S and OI-S could be transformed into sulfate as plant-available S. Most of the 35S uptake by plants came from sulfate-S-35, sulfide-S-35 and OI-S-35, with little contribution from C-O-S-35, C-bonded S-35 or NRO-S-35. In the treatment with 35 S-labeled rice straw, 23.3% and 26.4% of the 35 S applied was found in the sulfate-S fraction, 25.3% and 26.3% as sulfide-S, 6.0% and 6.1% as OI-S, 16.4% and 14.0% as CO-S, 10.1% and 8.3% as C-bonded S, and 18.9% and 18.9% as NRO-S at 120th day of incubation in these two soils, respectively. Higher availability of C-O-S-35, C-bonded 35 S and NRO-S-35 from S-35-labeled straw was observed in the S-35-labeled straw treatment, compared to the carrier-free (Na2SO4)-S-35 treatment. (c) 2005 Elsevier B.V. All rights reserved.

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