不同用量贝壳粉对酸性砖红壤的改良效果  

Effects of Application of Shell Powder at Different Rates on Amelioration of Latosol

作　　者：陈敏忠 李进 廖辉煌 高宇 苏会荣 CHEN Minzhong;LI jin;LIAO Huihuang;GAO Yu;SU Huirong(Zhanjiang Agrotechnical Extension Center,Zhanjiang,Guangdong 524000,China;Guangdong Ocean University,Zhanjiang,Guangdong 524088,China)

机构地区：[1]湛江市农业技术推广中心,广东湛江524000 [2]广东海洋大学化学与环境学院,广东湛江524088

出　　处：《热带农业科学》2021年第6期67-71,共5页Chinese Journal of Tropical Agriculture

基　　金：2019年广东省农业厅测土配方施肥基础工作(土壤检测)项目;广东海洋大学科研启动费项目(No.E15038);广东海洋大学教育教学改革项目(No.580320097);广东海洋大学大学生创新创业训练计划(No.S202010566062)。

摘　　要：以废弃贝壳为研究对象,粤西砖红壤为供试土壤,采用室内土壤培养的方法,研究高(S3,5 g/kg)、中(S2,1.0 g/kg)、低(S1,0.5 g/kg)3种用量的贝壳粉对酸性砖红壤的改良效果,探究贝壳粉改良酸性砖红壤的效果,以期为粤西滨海地区废弃贝壳利用及酸性砖红壤改良提供理论依据。结果表明,不同用量的贝壳粉对土壤pH、EC、交换性酸和Al3+含量、酸碱缓冲性的影响显著。S3和S2用量的贝壳粉均可显著提高酸性砖红壤的pH,而S1与CK处理间的pH无差异;不同用量贝壳粉均可显著降低土壤的潜性酸含量。整个培养期,S3、S2、S1的土壤交换性酸平均含量较CK分别减少了70%、59%、54%;S1、S2、S3处理的土壤交换性铝平均含量较CK分别减少了66%、76%、78%;S3的土壤酸碱缓冲性显著大于其它处理的;相较CK,S3、S2和S1的平均土壤缓冲容量分别提高12.61、6.39和2.44 mmol/kg。针对粤西沿海砖红壤区,建议回收废弃贝壳,并施用5 g/kg的贝壳粉对酸性砖红壤进行改良,既为废弃贝壳污染环境问题提供了新的解决途径,又可有效降低土壤中的活性酸和潜性酸含量,补充酸性土壤中的钙镁等盐基离子,提高土壤的酸碱缓冲性能。To provide reference for the utilization of seashells and amelioration of acidified lateritic soil in western Guangdong,lateritic soil,a typical soil in the Leizhou Peninsular,Guangdong province,was sampled from a sugarcane field and treated with shell powder at different rates(high,S3;medium,S2;low,S1;0,control)to observe the effect of shell powder on soil amelioration in a laboratory soil incubation experiment.The shell powder was ground from the waste shells collected from the coastal areas of western Guangdong.The results showed that the treatments S3 and S2 significantly increased the soil pH,but there was no remarkable difference in soil pH between the S1 and the control.The treatments S3,S2 and S1 significantly reduced the potential soil acidity in the latosol.The soil exchangeable acid in the treatments S3,S2 and S1 was reduced by 70%,59%and 54%,respectively as against the control,and the soil exchangeable aluminum decreased by 78%,76%and 66%,respectively.The soil pH buffer capacity was significantly higher in the treatment S3 than in the other treatments,and was raised by 12.61mmol/kg,6.39 mmol/kg and 2.44mmol/kg in the treatments S3,S2 and S1,respectively,compared to the control.It is suggested that the waste shells should be ground into shell powder and applied to the acidified lateritic soil in western Guangdong at a rate of 5 g·kg-1 for soil amelioration,which can effectively reduce active and potential acidity,supplement base cations calcium and magnesium in soil and improve the pH buffer capacity of soil.The recycle of the waste shells can be a new approach for solving the pollution of waste shells from the coastal areas of western Guangdong.

关 键 词：砖红壤 贝壳粉 交换性酸 土壤酸碱缓冲性 

分 类 号：S158[农业科学—土壤学]