Influence of rice straw biochar on growth, antioxidant capacity and copper uptake in ramie (Boehmeria nivea L.) grown as forage in aged copper-contaminated soil
Influence of rice straw biochar on growth, antioxidant capacity and copper uptake in ramie (Boehmeria nivea L.) grown as forage in aged copper-contaminated soil
复制标题
稻草生物炭对老化铜污染土壤中作为饲料种植的苎麻 (Boehmeria nivea L.) 生长、抗氧化能力和铜吸收的影响
DOI：
10.1016/j.plaphy.2019.02.021
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发表时间：
2019-05-01
影响因子：
6.5
通讯作者：
Siddique, Kadambot H. M.
中科院分区：
文献类型：
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作者：
Rehman, Muzammal;Liu, Lijun;Siddique, Kadambot H. M.
农业土壤中的铜（Cu）污染对生物体构成严重威胁，需要考虑可能的生态友好的解决方案来固定Cu，例如使用生物炭。采用盆栽试验研究了不同施用量（0、2.5、5和10%w/w）的稻草生物炭（RSB）对缓解苎麻（Boehmeria nivea L.）作为饲料。随着施用量的增加，植物生长参数以及土壤化学性质（pH值、电导率和阳离子交换量）显著改善。此外，显着减少土壤生物有效性铜浓度的96%，与对照相比，施用10%的RSB。另外，B中Cu含量随温度的升高而降低。施用10%RSB处理的根、叶和茎分别减少60%、28%和22%。结果表明，施用10%RSB处理的叶片叶绿素含量和气体交换参数显著高于对照。此外，10%的RSB导致更大的减少氧化胁迫从土壤中的铜。因此，土壤改良剂与RSB表现出积极的结果，在老铜污染土壤中的铜稳定，从而减少其积累和转运的B。nivea和减轻牲畜饲料安全风险。
Copper (Cu) contamination in agricultural soil poses severe threats to living organisms, and possible ecofriendly solutions need to be considered for Cu immobilization, such as using biochar. A pot study was conducted to examine the effectiveness of biochar derived from rice straw (RSB) at various application rates (0, 2.5, 5 and 10% w/w) to mitigate possible risks of Cu solubility and its uptake by ramie (Boehmeria nivea L.) as forage. The plant growth parameters as well as soil chemical properties (pH, electrical conductivity and cation exchange capacity) notably improved with the increasing RSB application. Moreover, prominent reduction was observed in soil bioavailable Cu concentration by 96% with RSB application of 10% relative to control. In addition, Cu content in B. nivea roots, leaves and stems decreased by 60, 28 and 22%, respectively, for 10% RSB application. It was noted that chlorophyll content and gas exchange parameters in leaves were significantly higher at 10% RSB application than in control. Furthermore, 10% RSB resulted in a greater reduction in oxidative stress from the Cu in soil. Thus, soil amendment with RSB demonstrated positive results for Cu stabilization in aged Cu-contaminated soil, thereby reducing its accumulation and translocation in B. nivea and mitigating livestock feed security risks.