| 唐行灿，林亚楠，陈金林，张民.生物炭对土壤固定铜及动植物行为的影响[J].广东农业科学,2014,41(19):47-51 |
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生物炭对土壤固定铜及动植物行为的影响 |
| Effect of biochar application on immobilization of Cu by soil and behaviour of pakchoi and earthworm |
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| DOI： |
| 中文关键词: 生物炭 铜 固定 小白菜 蚯蚓 |
| 英文关键词: biochar Cu immobilization pakchoi earthworm |
| 基金项目:国家“十二五”科技支撑计划项目(2011BAD11B01，2011BAD11B02)；国家“948”重点项目(2011-G30)；江苏高校优势学科建设工程资助项目 |
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| 中文摘要: |
| 通过表观吸附、小白菜盆栽、蚯蚓培养试验，研究了700益玉米秸生物炭不同的施加量（0.5%、1%、2%、5%）对铜的固定、小白菜生物量和铜富集以及蚯蚓SOD活力的影响，以期确定合适的生物炭施加量。吸附试验结果表明，施加生物炭可明显地增加未污染土壤对铜的表观吸附能力。与对照相比，施加生物炭后外源铜污染土壤pH增加了0.21~1.05个单位，有机质含量增加了4.8~23.13mg/kg，铜形态发生钝化，小白菜可食部铜浓度由89.2 mg/kg下降至80.5~38.6mg/kg，可食部铜含量（可食部干重与铜浓度的乘积）由0.149 mg下降至0.141~0.097 mg。生物炭降低铜的生物有效性的效果随着施加量的增加而更明显。不过，相对于2%施加量的处理，施加5%的生物炭后，发现小白菜产量降低和蚯蚓SOD活力增加，表明施加高量生物炭会对小白菜和蚯蚓产生胁迫。 |
| 英文摘要: |
| Apparent adsorption experiment, pot experiment of pakchoi, exposure experiment of earthworm were conducted in order to evaluate the effect of corn straw derived biochar (pyrolyzed at 700℃) amendment at different concentrations (0.5%, 1%, 2%, 5%) on Cu immobilization, pakchoi biomass and Cu bioaccumulation as well as earthworm SOD activity. Appropriate application rate of biochar was expected to identify. The result of adsorption experiment showed that biochar was effective in enhancing apparent sorption of uncontaminated soil on Cu2+. Compared with CK, the pH and organic matter of Cu spiked soil increased by 0.21~1.05 units and 4.8~23.13 mg/kg respectively after biochar addition and incubation. Biochar had the ability to prompt the inactivation of Cu in soil. After biochar application, Cu concentration in shoot of pakchoi decreased from 89.2 mg/kg to 80.5 ~38.6 mg/kg, and Cu content (multiply shoot dry biomass by Cu concentration) in shoot decreased from 0.149 mg to 0.141~0.097 mg. The effect of decrease in the bioavailability of Cu in the soil enhanced as the application rate of biochar rose. However, compared with 2% of biochar treatment, shoot dry weight of pakchoi decreased as well as SOD activity of earthworm increased when 5% of biochar were applied. These results indicated possible pernicious effect on pakchoi and earthworm when biochar added at 5%. |
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