| 强还原处理中pH对硫酸根去除效果及产物的影响 |
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| 引用本文： | 孟天竹,朱同彬,张金波,蔡祖聪.强还原处理中pH对硫酸根去除效果及产物的影响[J].土壤,2016,48(1):117-122. |
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| 作者姓名： | 孟天竹 朱同彬 张金波 蔡祖聪 |
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| 作者单位： | 1. 南京师范大学地理科学学院,南京,210023;2. 南京师范大学地理科学学院,南京 210023;江苏省物质循环与污染控制重点实验室,南京 210023;江苏省地理信息资源开发与利用协同创新中心,南京 210023 |
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| 基金项目： | 江苏省自然科学基金项目 (BK20140062)、国家自然科学基金项目 (41301313，41330744) 和江苏高校优势学科建设工程项目(PAPD，164320H116)资助 |
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| 摘 要： | 强还原灭菌法(reductive soil disinfestation,RSD),即淹水加有机物料创造强还原条件,可以有效修复退化土壤,但对硫酸根(SO42–)去除效率低。为探索RSD处理时p H对SO42–去除效果的影响,本试验选取SO42–积累严重的退化蔬菜地土壤(SO42–-S 939 mg/kg),设置5个处理:淹水(CK);淹水+紫花苜蓿(RSD0);淹水+紫花苜蓿+石灰,调节土壤至不同p H(分别标记为RSD1、RSD2和RSD3)。培养结束后CK处理中SO42–含量仍高达S 691 mg/kg,显著高于RSD处理中SO42–含量。在RSD处理中,SO42–含量随着p H的提高而下降,但其他形态硫含量显著升高,且施加石灰处理的土壤中总硫含量高于不加石灰的处理。由此说明,在强还原处理时施用石灰生成硫酸钙沉淀,可有效降低SO42–含量,但不利于降低总硫含量。
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| 关 键 词： | 退化土壤 RSD 石灰 SO42– |
| 收稿时间： | 2015/4/23 0:00:00 |
| 修稿时间： | 2015/10/13 0:00:00 |
Effects of Liming on Sulfate Removal and Transformation in Degraded Vegetable Soil Treated by Reductive Soil Disinfestation (RSD) |
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| MENG Tian-zhu,ZHU Tong-bin,ZHANG Jin-bo and CAI Zu-cong.Effects of Liming on Sulfate Removal and Transformation in Degraded Vegetable Soil Treated by Reductive Soil Disinfestation (RSD)[J].Soils,2016,48(1):117-122. |
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| Authors: | MENG Tian-zhu ZHU Tong-bin ZHANG Jin-bo and CAI Zu-cong |
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| Institution: | School of Geography Sciences,Nanjing Normal University,School of Geography Sciences,Nanjing Normal University,School of Geography Sciences,Nanjing Normal University and School of Geography Sciences,Nanjing Normal University |
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| Abstract: | Reductive soil disinfestations (RSD), namely amending organic materials and mulching or flooding to create strong reductive status, has been widely applied to improve degraded soils, but the removal efficiency of sulfate (SO42–) in RSD is low. To investigate the effect of liming on SO42– removal during RSD treatment, a SO42–accumulated (939 mg/kg) vegetable soil was treated by five treatments: control (flooding only, noted as CK), flooding + alfalfa (RSD0) and RSD0 + lime at three application rates, which adjusted soil pH to 6.7, 7.7 and 8.4, noted as RSD1, RSD2 and RSD3, respectively. The results showed that SO42–content in CK treatment was as high as 691 mg/kg, and was significant higher than those in RSD treatments after the incubation. In RSD treatments, SO42–contents decreased with the increase of pH. But, other sulfur (S) forms increased significantly, which indicated that disappeared SO42– was mainly transformed into other S forms. Total S contents in RSD+liming treatments were higher than that in RSD0 treatment. The results indicates that liming stimulates the conversion of SO42– into calcium sulfate, which effectively decreases SO42– content but cannot decrease total S content. |
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| Keywords: | Degraded soil RSD Lime SO42- |
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