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| Influences of Soil pH and Cultivation Years on Active Aluminum Species Distribution from Tea Soils in Southern Anhui, China |
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| KeyWord:tea garden soils; active aluminum; species distribution; pH; cultivation years |
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| Abstract: |
| Effects of soil pH and active aluminum species distribution by different cultivating years in three typical tea gardens of Southern Anhui Province were studied. Experimental result showed that active aluminum had four species in tea soil, exchangeable aluminum Al3+, unimer hydroxyl aluminum Al（OH）2+ Al（OH）+2, colloidal aluminum Al（OH）03 and humic-acid aluminum Al-HA. With the increasing of cultivating years, the content of humic-acid aluminum was in downtrend, the exchangeable aluminum was increased to a low level while the content of unimer hydroxyl aluminum decreased gently. According to the Pearson′s correlation analysis indicated that 0~20 cm layer soil pH value were high significantly correlated with Al3+（r=-0.819, P<0.01）, cultivation years（r=-0.952, P<0.01）, Al-HA（r=0.929, P<0.01）and not related with Al（OH）03（r=-0.359, P>0.05）, and with Al（OH）2+ Al（OH）+2 had a positive correlation, correlation coefficient was 0.658（P<0.05）. 20~40 cm layer soil, the correlation coefficient significant was lower than 0~20 cm layer soil. The pAl-pH linear regression analysis showed that the slope of linear regression equations were 0.281~0.659, deviated gibbsite model, and the coefficients of determination were above 0.90. So, the exchangeable aluminum has obvious effect on the pH in tea soils（P<0.05）. Different aluminum species inclined to transform each other with pH change. Compared with natural soil, cultivating tea trees could promote exchangeable aluminum accumulated in tea soil. With the increasing of cultivating years, tea garden soil tends to acidification, and becames more and more serious. |
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