不同植茶品种土壤团聚体及其全铝和交换态铝的分布特征

为弄清不同植茶品种土壤团聚体的组成,阐明团聚体中全铝和交换态铝的分布特征,揭示土壤团聚体中全铝和交换态铝对不同植茶品种的响应规律,在野外调查的基础上,结合室内分析,开展种植福鼎大白、川茶3号、川农黄芽早、川沐217的土壤团聚体全铝和交换态铝分布特征研究。结果表明,不同植茶品种的土壤团聚体含量随粒径的减小总体呈先降低后增加的变化趋势,其中以5 mm粒径为主,其含量处于60.52%～76.49%之间,0.5～0.25 mm粒径含量最少,种植福鼎大白的土壤5 mm粒径团聚体的含量高于其他品种;土壤全铝和交换态铝含量在小粒径团聚体中最高,种植川茶3号的土壤团聚体全铝和交换态铝含量最高;5 mm粒径团聚体对土壤全铝和交换态铝的贡献率最高,介于53.10%～68.10%之间。5 mm粒径团聚体对铝含量的贡献率表现为福鼎大白川茶3号川沐217川农黄芽早。与其他植茶品种相比,种植福鼎大白的土壤0.25 mm粒径团聚体含量最高,结构性较好;种植川茶3号的土壤各粒径全铝和交换态铝含量高于其他品种。土壤中铝含量过高会加剧土壤酸化,影响土壤生产力和质量。

Distribution of total and exchangeable aluminum in soil aggregates with different tea cultivars

In this study, we aimed to investigate the composition of soil aggregates and the distribution of total and exchangeable aluminum in soil aggregates with different tea cultivars. The content of total and exchangeable aluminum in soil aggregates with different tea cultivars (Fudingdabaicha, Chuancha No.3, Chuannonghuangyazao, and Chuanmu No.217) was measured. The results showed that the content of soil aggregates initially decreased, and then increased with the decrease in particle size of soil aggregates. The content of >5 mm aggregates was relatively high, accounting for 60.52%~76.49% of the total soil. However, the content of 0.5~0.25 mm aggregates was relatively low. The highest content of soil aggregates was observed in soil cultivated with Fudingdabaicha. Higher content of total and exchangeable aluminum was observed in smaller aggregates. The content of total and exchangeable aluminum in soil aggregates cultivated with Chuancha No. 3 was the highest among tea cultivars. The contribution rate of total and exchangeable aluminum for >5 mm aggregates, which was 53.10%~68.10%, was found to be the highest. The contribution rate of > 5 mm aggregates for soil with Fudingdabaicha was higher than that for soil with Chuancha No.3, followed by Chuanmu No.217 and Chuannonghuangyazao. Among the four tea cultivars, the soil cultivated with Fudingdabaicha showed the highest content of > 0.25 mm aggregates with better soil structure. The content of total and exchangeable aluminum in soil aggregates cultivated with Chuancha No.3 was higher than that with other tea cultivars. Higher aluminum content in soil aggregates results in soil acidification, and also soil productivity and quality.