Mineralization of organic sulfur and its importance as a reservoir of plant-available sulfur in upland soils of north China |
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Authors: | W. Zhou S. T. Li H. Wang P. He B. Lin |
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Affiliation: | (1) Institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, 30 Baishiqiao Road, Beijing 100081, China e-mail: Wzhou@ppi.caas.ac.cn, Tel.: +86-10-68918671 Fax: +86-10-68975161, CN |
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Abstract: | An open incubation technique was used to measure S mineralization in a range of upland soils of north China. Six mineralization patterns were examined, and a soil S-exhaustion experiment with ryegrass (Lolium multiflorum L.) was conducted to investigate the availability of various organic S pools to plants. For all of the 12 soils tested, the release of S as SO4 2– was curvilinear with time, and during a 28-week incubation at 30 °C the amount of S mineralized ranged from 14.0 mg S kg–1 soil to 37.4 mg S kg–1 soil. A first-order model and Gompertz model appeared to best describe S mineralization. Examination of the soils after incubation revealed the bulk of the mineralized S was mainly derived from the C-bonded S pool, while the majority of mineralized S under soil S exhaustion by ryegrass was derived from the HI-reducible S pool. Received: 9 July 1998 |
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Keywords: | Organic sulfur Mineralization Sulfur exhaustion Sulfur fraction Upland soils |
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