秸秆和猪粪对小麦镉吸收的影响

摘要/Abstract

摘要： 采用盆栽试验，以黄棕壤和潮土为供试土壤，每种土壤上按照有机碳加入量一致的原则设置5个处理，分别为对照（不添加有机物）、1.1%和2.7%秸秆处理、2%和5%猪粪处理，研究施用秸秆和猪粪对小麦Cd含量、土壤Cd形态、pH值、有机质组成的影响，为利用有机物调控小麦Cd污染提供科学依据。结果表明，施用秸秆和猪粪均可显著降低小麦各部位Cd含量。施用秸秆和猪粪均可促进土壤Cd由活性较强的交换态向其他形态转化。土壤交换态Cd含量与小麦Cd含量呈极显著正相关。秸秆对土壤pH值总体上无显著影响，猪粪可显著降低潮土pH值，增加黄棕壤pH值。施用秸秆和猪粪可使土壤胡敏酸（HA）与富里酸（FA）的比值HA/FA显著升高。土壤HA/FA与交换态Cd含量呈极显著负相关；土壤交换态Cd含量与pH值只有在猪粪施入黄棕壤的处理中呈极显著负相关，在其他处理中均呈正相关。综上，施用秸秆和猪粪均可通过促进土壤Cd形态的转化抑制小麦对Cd的吸收，其机制主要与土壤有机质组成和pH值有关。

关键词: 秸秆, 猪粪, 镉, 小麦, 吸收

陕红，孙宝利. 秸秆和猪粪对小麦镉吸收的影响[J]. 河南农业科学, 2019, 48(4): 14-20.

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