添加玉米秸秆重金属污染对水稻土有机碳矿化的影响
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S153.6

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国家自然科学基金项目(41471193,41501353)和江苏高校品牌专业建设工程项目(PPZY2015A061)资助。


Effects of Different Gradients of Heavy Metal Contamination on Soil Organic Carbon Mineralization of Paddy Soil with Addition of Corn Straw
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    摘要:

    为研究重金属污染环境胁迫下新碳的添加对水稻土有机碳矿化的影响,以苏南地区不同程度Cd/Pb污染的水稻土为研究对象,通过室内培养法,研究了添加玉米秸秆(新碳)条件下重金属污染对水稻土有机碳(老碳)矿化的影响。试验通过测定土壤CO2-C排放动态及其δ13C值、总有机碳和活性碳库组分含量,计算了相对激发效应,探讨了不同程度重金属污染对水稻土新老有机碳矿化的影响。结果表明:新鲜有机碳的添加均提高了土壤有机碳的矿化速率和累计矿化量,添加玉米秸秆后不同程度重金属污染的水稻土有机碳累积矿化量分别提高了120%(轻度污染土壤,P0)、540%(较高程度污染土壤,P1)和360%(高度污染土壤,P2)。添加玉米秸秆同时促进了不同程度重金属污染水稻土中原有有机碳的矿化速率,相对于P0与P1土壤,P2土壤更能促进水稻土老碳的矿化,并降低了可溶性有机碳含量,且在培养的不同阶段P2土壤相对激发效应显著高于P0与P1土壤,在培养第30天时相对激发效应值达到最高,分别为47.3%(P0)、148.2%(P1)、189.2%(P2)。

    Abstract:

    Paddy soil samples with different degrees of Cd/Pb contamination in south Jiangsu were collected, and an incubation experiment was conducted to study the effects of corn straw addition (fresh carbon) on the mineralization of soil organic carbon (SOC, old carbon). CO2 fluxes, δ13C abundance, contents of total organic carbon and labile organic carbon fractions were measured, and the priming effect after corn straw addition was calculated. The results showed that the corn straw addition increased the mineralization rate and cumulative mineralization of SOC, and the cumulative mineralization of SOC increased by 120% for light pollution (P0), 540% for moderate pollution (P1), and 360% for heavy pollution (P2), respectively. Moreover, corn straw addition also promoted the mineralization rate of the original SOC. Compared with P0 and P1, P2 could further promote the mineralization of old carbon in paddy soil and reduce the content of dissolved organic carbon, and its relative priming effect was significantly higher than those of P0 and P1 in different incubation stages. The relative priming effects reached the highest at the 30th day, which were 47.3% for P0, 148.2% for P1, and 189.2% for P2, respectively.

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应 多,赵熙君,张旭辉,徐子银,闫 华,张玉娇,郑聚锋,刘晓雨,李恋卿,潘根兴.添加玉米秸秆重金属污染对水稻土有机碳矿化的影响[J].土壤,2020,52(2):340-347. YING Duo, ZHAO Xijun, ZHANG Xuhui, XU Ziyin, YAN Hua, ZHANG Yujiao, ZHENG Jufeng, LIU Xiaoyu, LI Lianqing, PAN Genxing. Effects of Different Gradients of Heavy Metal Contamination on Soil Organic Carbon Mineralization of Paddy Soil with Addition of Corn Straw[J]. Soils,2020,52(2):340-347

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历史
  • 收稿日期:2018-05-02
  • 最后修改日期:2018-07-05
  • 录用日期:2018-07-09
  • 在线发布日期: 2020-04-23
  • 出版日期: 2020-04-25