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王宇函,吕波,张林,姜存仓.不同土壤改良剂对酸性铝富集红壤毒性缓解效应的差异[J].华中农业大学学报,2019,38(2):73-80
不同土壤改良剂对酸性铝富集红壤毒性缓解效应的差异
Differences in toxicity mitigation effects of different anendments on acidic aluminum enriched red soil
投稿时间:2018-04-25  
DOI:
中文关键词:  改良剂  小白菜  红壤  活性铝  铅毒缓解效应
英文关键词:anendment  pakchoi  red soil  active aluminum  aluminum toxicity alleviation effects
基金项目:国家重点研发计划项目(2017YFD0200803);中央高校基本科研业务费专项(2017PY055)
作者单位E-mail
王宇函 华中农业大学资源与环境学院/微量元素研究中心武汉 430070 wangyuhan@webmail.hzau.edu.cn 
吕波 华中农业大学资源与环境学院/微量元素研究中心武汉 430070  
张林 华中农业大学资源与环境学院/微量元素研究中心武汉 430070  
姜存仓 华中农业大学资源与环境学院/微量元素研究中心武汉 430070 jcc2000@mail.hzau.edu.cn 
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中文摘要:
      在红壤中添加外源铝并种植作物,研究不同土壤改良剂对酸性铝富集土壤的铝毒缓解效应差异及潜在机制。采用酸性红壤做盆栽试验,添加外源铝,并施用土壤改良剂腐殖酸(HA)、生物炭(C)和生石灰(CaO)种植小白菜,设置CK、HA(0.3%HA)、C(2%C)、CaO(0.3%CaO)、Al(1 mmol/kg Al3+)、Al+HA(1 mmol/kg Al3+ +0.3%HA)、Al+ C(1 mmol/kg Al3++2%C)、Al+ CaO(1 mmol/kg Al3++0.3% CaO)共8个处理,分析腐殖酸、生物炭和生石灰对铝富集红壤不同形态活性铝及作物生长的影响。结果表明:铝毒会显著降低小白菜的出苗率和鲜质量,提高小白菜铝含量;而施用改良剂能缓解铝毒对小白菜的抑制作用,改善小白菜的生长状况,降低小白菜铝含量,Al+HA、Al+C和Al+CaO处理小白菜鲜质量较Al处理分别增加86%、775%和1 014%。添加外源Al较CK处理土壤pH降低0.17个单位,活性铝总量显著增加,而添加改良剂后活性铝总量减少。此外,Al处理交换性Al3+含量较CK 处理上升11.17%,Al+HA、Al+ C和Al+ CaO 处理交换性Al3+含量较Al处理分别下降11.81%、59.63%和87.82%,而单聚体羟基铝离子Al(OH)2+和Al(OH)+2含量却上升。因此,在土壤中加入外源铝显著降低土壤pH,加重酸化,且交换性Al3+增加,抑制小白菜生长;施用改良剂腐殖酸、生物炭和生石灰后交换性Al3+含量降低,小白菜生长状况得到改善,其中生物炭和生石灰还能有效增加红壤pH。因此,改良剂通过对土壤 pH、养分含量和交换性Al3+含量产生综合作用从而影响作物生长。
英文摘要:
      Aluminum toxicity is one of the main factors limiting the growth of crops in southern acid soils.In this experiment,the differences and potential mechanisms of aluminum toxicity alleviation effects of different modifiers on acid aluminum enriched soils were studied by adding exogenous aluminum and planting crops in red soil.Pot experiment with acid red soil,adding exogenous aluminum,and applying anendment humic acid(HA),biochar(C) and quicklime(CaO),planting pakchoi,setting 8 treatments including CK,HA (0.3% HA),C (2% C),CaO(0.3% CaO),Al(1 mmol/kg Al3+),Al+HA (1 mmol/kg Al3++0.3% HA),Al+ C (1 mmol/kg Al3++2% C),Al+CaO (1 mmol/kg Al3++0.3% CaO) was conducted to analyze the effects of humic acid,biochar and quicklime on different forms of active aluminum and crop growth in aluminum rich red soil.The results showed that aluminum toxicity significantly decreased the emergence rate and fresh weight of pakchoi,and increase the aluminum content in pakchoi.The growth of pakchoi improved and the Al content reduced under amendment addition.Compared with Al treatment,the fresh weight of Al+HA,Al+C,Al+CaO treated pakchoi reduced by 86%,775% and 1 014%,respectively.The pH of Al treatment decreased by 0.17 compared with CK treatment,the content of active aluminum significant increased,the amount of active aluminum decreased after added the amendment.The exchangeable Al3+ of Al treatment increased by 11.17% compared with CK treatment,but the exchangeable Al3+ of Al+HA,Al+C and Al+CaO treatment decresed by 11.81%,59.63% and 87.82% compared with Al treatment.The content of dimer hydroxyl aluminum ion Al(OH)2+,Al(OH)+2 increased.The exogenous aluminum significantly reduced soil pH.The content of exchangeable Al3+ increased,inhibiting the growth of pakchoi.Humic acid,biochar and calcareousness reduced the exchangeable Al3+ content.Biochar and calcareousness effectively reduced the pH of red soil and improved the growth of pakchoi.It is indicated that anendment affects crop growth by combining soil pH,nutrient content and exchangeable Al3+ content.
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