HNO3改性荔枝木生物炭对大豆累积Cu、Ca、As、Cd的影响
Effects of HNO3 Modified Biochar on Accumulation of Cu, Ca, As and Cd in Soybean
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摘要: 采用盆栽实验，在土壤中施用不同用量的HNO3改性荔枝木生物炭（质量比分别为0.125%、0.250%、0.500%和1.000%）对重金属污染土壤进行改良；研究了HNO3改性荔枝木生物炭对大豆植株累积与分配Cu、Ca、As和Cd的影响。结果表明：（1）低浓度的HNO3改性荔枝木生物炭抑制了大豆植株的生长，较高浓度的HNO3改性荔枝木生物炭刺激了大豆植株的生长。（2） HNO3改性荔枝木生物炭提高了大豆籽粒的生物量。HNO3改性荔枝木生物炭施用量为1.000%时，大豆籽粒生物量达到最大值，比对照组增加了25.000%。（3） HNO3改性荔枝木生物炭提高了大豆植株修复重金属污染土壤的能力；HNO3改性荔枝木生物炭施用量为0.125%时，大豆植株As总量达到最大值，比对照组增加了47.059%；HNO3改性荔枝木生物炭施用量为0.250%时，大豆植株Cu和Cd总量达到最大值，分别比对照组增加了25.506%、44.048%；HNO3改性荔枝木生物炭施用量为1%时，大豆植株Ca总量达到最大值，比对照组增加了65.778%。（4）施加HNO3改性荔枝木生物炭后，大豆籽粒中As的含量增加，但未超出《食品安全国家标准食品中污染物限量》（GB 2762—2017）标准中规定的食品限量值。（5）施加HNO3改性荔枝木生物炭后，大豆籽粒中Cd的含量降低；HNO3改性荔枝木生物炭施用量为1.000%时，大豆籽粒中Cd含量达到最小值，比对照组降低了69.620%，未超出《食品安全国家标准食品中污染物限量》（GB 2762—2017）食品安全限量值。这表明，HNO3改性生物炭可以用作改良剂修复重金属复合污染土壤，降低食物链中重金属的暴露水平。Abstract: Pot experiment was conducted to remediate heavy metal contaminated soil with different amounts of HNO3 modified lychee biochar (0.125%, 0.250%, 0.500% and 1.000%, w/w), and the effects of HNO3 modified lychee biochar on the accumulation and distribution of Cu, Ca, As and Cd in soybean plants were studied. Results showed as follows:(1) Low addition amount of HNO3 modified lychee biochar inhibited the growth of soybean plants, while high addition amount of HNO3 modified lychee biochar promoted the growth of soybean plants. (2) HNO3 modified lychee biochar increased the biomass of soybean seeds. At the addition of 1.000% HNO3 modified lychee biochar, the soybean seeds biomass reached the maximum, which increased by 25.000% compared with the control group. (3) HNO3 modified lychee biochar improved the ability of soybean plants to remediate heavy metal contaminated soil. At the addition of 0.125% HNO3 modified lychee biochar, the total amount As accumulated in soybean plant reached the maximum, which increased by 47.059% compared with the control group; at the addition of 0.250% HNO3 modified lychee biochar, the total Cu and Cd accumulated in soybean plant reached the maximum, which increased by 25.506% and 44.048% respectively compared with the control group; at the addition of 1.000% HNO3 modified lychee biochar, the total Ca in soybean plant reached the maximum, which increased by 65.778% compared with the control group. (4) The addition of HNO3 modified lychee biochar to heavy metal contaminated soil increased the concentration of As in soybean seeds, but not exceeding the contamination limit in national standard (GB 2762-2017). (5) The addition of HNO3 modified lychee biochar to heavy metal contaminated soil decreased the concentration of Cd in soybean seeds; at the addition of 1.000% HNO3 modified lychee biochar, the Cd accumulated in soybean seeds reached the minimum, which decreased by 69.620% compared with the control group, it is lower than the contamination limit of national standard (GB 2762-2017). These results indicated that HNO3 modified biochar could be used as modifier to remediate the heavy metal contaminated soil and reduce the exposure levels of heavy metals in the food chain.
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Key words:
- heavy metal /
- soybean /
- accumulation /
- modified biochar
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