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A(lOH)2+A(lOH)+2、胶体态铝A(lOH)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A(lOH)2+A(lOH)+2呈缓慢下降。0～20cm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A(lOH)2+A(lOH)+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),20～40cm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。
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 A13＋, un- imer hydroxyl aluminum A1 （ OH ）2＋ A1 （ OH ）, colloidal aluminum A1 （OH）0 and humic-aeid aluminum A1-HA. With the increasing of culti- vating years, the content of humic-acid aluminum was in downtrend, the exchangeable aluminum was increased to a low level while the con- tent of unimer hydroxyl aluminum decreased gently. According to the Pearson＇s correlation analysis indicated that 0-20 em layer soil pH val- ue were high significantly correlated with AP＋（r=-0.819, P〈0.01 ）, cultivation years （r=-0.952, P〈0.01 ）, A1-HA （r=0.929, P〈0.01 ）and not related with AI（OH） （r=-0.359, P〉0.05 ）, and with AI（OH）2 AI（OH） 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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第4期721-728,共8页
Journal of Agro-Environment Science
基金
国家茶叶产业技术体系土壤肥料岗位资金资助
关键词
茶园土壤
活性铝
形态分布
PH
植茶年限
tea garden soils
active aluminum
species distribution
pH
cultivation years
