秸秆还田对黑土中磷素吸附特性及释放风险研究

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摘要通过分析秸秆离田免耕(MG)、秸秆覆盖还田(FG)、秸秆深翻还田(SF)对土壤理化性质及土壤磷素的吸附特性的影响,研究由于土壤理化性质的改变对于磷吸附特性的影响,并进一步分析磷素在土壤中的释放风险.结果表明,秸秆还田后,土壤有机质、有效磷含量增大,土壤容重降低.与秸秆离田免耕相比,秸秆覆盖还田后土壤磷的吸附量减少20.1%,秸秆深翻还田后的土壤磷的吸附量减少35.0%.3种不同耕作模式下黑土中DPS(磷饱和度)分别为MG:0.3%,FG:4.0%,SF:10.2%,PSI(磷吸持指数)分别为MG:41.14,FG:40.04,SF:36.09(mg P/(100g))/(μmol/L),ERI(磷释放风险指数)分别为MG: 0.7%,FG: 9.9%,SF:28.3%.综上所述,秸秆覆盖还田及秸秆深翻还田均可显著增加土壤有机质,降低土壤对磷的吸附能力,提高土壤磷的有效性,但同时也提高了土壤磷吸附饱和度,易引起磷素流失的风险.

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	温芳悦
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	王玉军

关键词 ：黑土, 秸秆还田, 磷吸附, 释放风险

Abstract：By analyzing the effects of straw no-tillage (MG), straw mulching (FG) and straw deep turning (SF) on soil physicochemical properties and soil phosphorus adsorption characteristics, the effects of soil physicochemical properties on phosphorus adsorption characteristics were studied, and the release risk of phosphorus in soil was further analyzed. The results showed that the contents of soil organic matter and available phosphorus increased, and the bulk density of soil decreased after straw returning. Compared with no-tillage, the adsorption capacity of soil phosphorus was reduced by 20.1% after straw mulching and returning to the field, and the adsorption capacity of soil phosphorus after straw deep turning and returning to the field was reduced by 35.0%.The DPS (phosphorus saturation) in black soil under the three different tillage modes were MG: 0.3%, FG: 4.0%, SF: 10.2%, PSI (phosphorus uptake index) were MG: 41.14, FG: 40.04, SF: 36.09 (mg P/(100g))/(mmol/L), and ERI (phosphorus release risk index) were MG: 0.7%, FG: 9.9%, and SF: 28.3%, respectively. Straw mulching and deep straw returning can significantly increase soil organic matter, reduce soil phosphorus adsorption capacity, and improve soil phosphorus effectiveness, but also improve soil phosphorus adsorption saturation, which can easily cause the risk of phosphorus loss.

Key words： black soil straw returning to field phosphorus adsorption release risk

收稿日期: 2024-01-21

PACS:

X53

基金资助:国家重点研发计划项目(2021YFD1500805);吉林省自然科学基金资助项目(20220101175JC)

作者简介: 温芳悦(1998-),女,吉林吉林人,硕士,主要从事农业面源污染研究.发表论文4篇.1059390249@qq.com.

引用本文:

温芳悦, 张羽, 陈尚才, 王玉军. 秸秆还田对黑土中磷素吸附特性及释放风险研究[J]. 中国环境科学, 2024, 44(8): 4475-4483. WEN Fang-yue, ZHANG-Yu, CHEN Shang-cai, WANG Yu-jun. Characterization of phosphorus adsorption and risk of phosphorus release from black soil by returning straw to the field. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4475-4483.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4475

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