不同植茶年限土壤团聚体全铝和交换态铝的分布特征  

Distribution of Total and Exchangeable Aluminum in Soil Aggregates Under Different Tea-Planting Years

作　　者：殷佳丽[1] 郑子成[1] 李廷轩[1] 

机构地区：[1]四川农业大学资源学院,成都611130

出　　处：《农业环境科学学报》2015年第5期891-896,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(40901138);四川省学术和技术带头人培养资金项目(2012);四川农业大学学科双支计划项目(2014)

摘　　要：为阐明土壤团聚体全铝和交换态铝含量对植茶年限的响应特征,给茶园科学管理提供理论依据,采用野外实地调查和室内分析相结合的方法,以植茶16、23、31、53 a的土壤为研究对象,开展不同植茶年限土壤团聚体全铝和交换态铝的分布特征研究。结果表明:土壤全铝和交换态铝含量均随粒径的减小而升高,且主要分布于<0.25 mm粒径团聚体,分别为86.11~98.35 g·kg-1和62.78~228.85 mg·kg-1;随植茶年限的延长,各粒径团聚体全铝含量逐渐降低;但交换态铝含量有所升高,且在植茶23 a后增幅较大;不同植茶年限土壤团聚体交换态铝表聚现象明显;不同粒径团聚体对土壤全铝和交换态铝的保持和供应能力存在明显差异,全铝和交换态铝有向小粒径团聚体富集的趋势;土壤团聚体对全铝和交换态铝的贡献率分别有49%~79%和44%~73%来自>5 mm粒径团聚体,且在植茶23 a时最高。因此,应注意植茶23 a后0~20 cm土层交换态铝含量的变化。To clarify the effect of tea-planting years on total and exchangeable aluminum in soil aggregates, content of total and exchange-able aluminum in soil aggregates under different tea-planting years(16, 23, 31 and 53 years) was measured. Results showed that:The content of total and exchangeable aluminum increased with decreasing particle sizes of soil aggregates. Higher content of total and exchangeable aluminum was found in <0.25 mm aggregates, ranging from 86.11 to 98.35 g·kg-1and 62.78 to 228.85 mg·kg-1, respectively.With increasing number of tea-planting years, total aluminum decreased in all soil aggregates. However, the content of exchangeable aluminum increased over planting years and such increase became greater in soils with tea planting older than 23 years. Exchangeable aluminum obviously accumulated in surface soil aggregates. Different sizes of soil aggregates had different retaining and supplying capacity of total aluminum and exchangeable aluminum, which tended to be greater in smaller aggregates. The contribution of different size aggregates to soil total aluminum and exchangeable aluminum were greater in >5 mm than in other aggregates, with 49%~79% and 44%~73%, respectively. They increased initially and decreased then with tea-planting years, with the maximum values found at 23 years of tea planting.Therefore, it is critical to pay attention to the content of exchangeable aluminum in tea soils(0~20 cm)with older than 23 years.

关 键 词：植茶年限 土壤团聚体 全铝 交换态铝 

分 类 号：S152.4[农业科学—土壤学]