| 王展,张玉龙,邹洪涛.冻融作用对东北黑土重金属Cd吸附能力及吸附形态的影响[J].农业环境科学学报,2026,45(2):391-399. |
| 冻融作用对东北黑土重金属Cd吸附能力及吸附形态的影响 |
| Influence of freeze/thawing on Cd adsorption capacity and formation of the adsorbed Cd in a chernozem soil |
| 投稿时间：2025-02-13 修订日期：2025-05-15 |
| DOI：10.11654/jaes.2025-0128 |
| 中文关键词: 黑土 Cd 冻融作用 吸附能力 吸附形态 |
| 英文关键词: chernozem soil Cd freeze/thawing adsorption capacity adsorbed formation |
| 基金项目:国家自然基金青年基金项目（41601218）；辽宁省教育厅面上项目（LJKZ0663）; 国家重点研发计划项目（2023YFD1501102） |
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| 中文摘要: |
| 为了明确土壤含水量和冻融次数对土壤Cd吸附能力和吸附形态的影响，本试验以黑土为研究对象，测定了不同土壤含水量和不同冻融次数条件下，土壤对Cd的吸附过程、吸附能力、吸附Cd的赋存形态及生物活性。结果表明：黑土对Cd的吸附能力随着冻融次数的增加先增加后降低，冻融3次时黑土对Cd的吸附能力最强。当土壤含水量为田间持水量的70%时，土壤Cd的吸附能力对冻融处理最敏感，含水率过低或过高均会降低冻融作用对黑土Cd吸附能力的影响。不同冻融处理下黑土吸附Cd的形态主要是交换态，其含量高于58%，吸附过程主要受物理吸附作用控制。冻融过程对不同吸附形态Cd的影响不同。随着冻融次数的增加，交换态 Cd含量变化不明显，碳酸盐结合态、铁锰氧化物结合态和有机结合态 Cd含量呈波动性降低的趋势，残渣态 Cd含量则逐渐升高。除冻融次数对交换态Cd和土壤含水量对碳酸盐结合态Cd外，土壤含水量和冻融次数对不同吸附形态Cd含量的影响均达到显著水平。黑土吸附Cd的生物活性较强，但冻融作用对土壤吸附Cd的生物活性影响较弱，仅土壤含水量对吸附Cd迁移能力的影响达到显著水平。研究表明，少次冻融交替可提高土壤Cd的吸附能力，而适当的土壤含水量能够增强土壤Cd吸附能力对冻融作用的响应。冻融作用影响吸附Cd的赋存形态，进而影响其生物活性。 |
| 英文摘要: |
| To determine the effects of soil moisture content and freeze-thaw times on the Cd adsorption capacity and adsorbed formation in chernozem soil, this study investigated the adsorption process of Cd on soil which subjected to different freeze/thawing times under different soil water content conditions, and the chernozem soil was chosen as the tested soil. The adsorption ability of Cd absorbed on soil, the form of adsorbed Cd and their biological activity were measured. The results indicated that the Cd adsorption capacity of chernozem soil enhanced first and then reduced with the freeze/thawing times increase, and it reached the maximum when the soil was subjected to 3 freeze/thawing times. When the soil moisture content was adjusted to 70% of the field capacity, the Cd adsorption capacity of chernozem soil was the most sensitive to freeze-thaw treatments. The lower or higher water content both reduced the influence of freeze/thawing on the Cd adsorption capacity of chernozem soil. The main form of adsorbed Cd on soil subjected with different freeze/thawing treatments was exchange state, the content of which is more than 58%, and the physical sorption was the dominant mechanism in the adsorption progress. The influences of freeze/thawing on different forms of adsorbed Cd were various. With the increase of freeze/thawing times, the content of exchange state Cd was stable, the content of carbonate Cd, Fe-Mn oxide Cd and organic binding state Cd decreased, and that of residual state Cd gradually increased. Soil water content and freeze-thaw times had significant effects on the different forms of adsorbed Cd on soil （except for the freeze/thawing times on exchange Cd, and the soil water content on carbonate bonded Cd）. The bioactivity of adsorbed Cd in chernozem soil is strong, but the effect of freeze/thawing on the bioactivity of it is weak, only the soil water content has a significant effect on the migration ability of adsorbed Cd. The results showed that the less freeze/thawing times could increase the Cd adsorption capacity in chernozem soil, and appropriate soil water content can enhance the response of Cd adsorption capacity of soil to freeze/thawing. The freeze/ thawing affected the form of adsorbed Cd, and then affected its biological activity. |
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