| .皖南茶园土壤活性铝形态分布与土壤pH和植茶年限的关系[J].农业环境科学学报,2013,32(4):. |
| 皖南茶园土壤活性铝形态分布与土壤pH和植茶年限的关系 |
| Influences of Soil pH and Cultivation Years on Active Aluminum Species Distribution from Tea Soils in Southern Anhui, China |
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| DOI：10.11654/jaes.2013.04.010 |
| 中文关键词: 茶园土壤 活性铝 形态分布 pH 植茶年限 |
| 英文关键词: tea garden soils active aluminum species distribution pH cultivation years |
| 基金项目: |
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| 摘要点击次数: 2300 |
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| 中文摘要: |
| 通过采集皖南3个典型茶园土壤和实验室分析，研究了在不同植茶年限下茶园土壤pH和活性铝形态分布特征。结果表明：茶园土壤中活性铝的形态主要有交换态铝Al3+、单聚体羟基铝Al（OH）2+ Al（OH）+2、胶体态铝Al（OH）03和腐植酸铝Al-HA，总体上随着植茶年限的增加Al-HA含量呈明显下降趋势，而Al3+呈稳步上升趋势，单聚体羟基铝Al（OH）2+Al（OH）+2呈缓慢下降。0~20 cm层土壤pH值与Al3+、植茶年限呈极显著负相关（-0.819、-0.952，P<0.01），与Al（OH）2+、Al（OH）+2呈显著正相关（0.658，P<0.05），与Al-HA呈极显著正相关（0.929，P<0.01），20~40 cm层土壤pH与各形态活性铝及植茶年限间的相关性不显著。pAl-pH的线性回归方程的斜率在0.281~0.659之间，都明显偏离了三水铝石模型，而方程的决定系数都在0.90以上，表明茶园土壤中Al3+活度对土壤pH的影响还是很显著的。与自然土相比，植茶促进交换态铝在茶园土壤中的累积，土壤种茶后趋于酸化，种茶时间越长酸化越严重，而茶园土壤pH与土壤活性铝总量是呈负相关的。 |
| 英文摘要: |
| 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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