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| Distribution of Total and Exchangeable Aluminum in Soil Aggregates Under Different Tea-Planting Years |
| Received:December 19, 2014 |
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| KeyWord:tea planting year;soil aggregate;total aluminum;exchangeable aluminum |
| Author Name | Affiliation | E-mail | | YIN Jia-li | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | ZHENG Zi-cheng | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | zichengzheng@aliyun.com | | LI Ting-xuan | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| To clarify the effect of tea-planting years on total and exchangeable aluminum in soil aggregates, content of total and exchangeable 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-1 and 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. |
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