油茶林地土壤铝的含量和化学形态分析

为探讨油茶林地土壤铝的化学形态、土壤铝含量与油茶叶片铝含量的相关性,测定了湖南省14个油茶林地土壤和油茶叶片的铝含量以及土壤铝的化学形态。结果表明:油茶林地根际土壤和0~20 cm土层总铝含量差异不显著,但土壤中不同形态铝含量有明显的差异,含量由高到低依次为有机态络合铝、酸溶无机铝、腐殖酸铝、可交换铝、单聚体羟基铝,有机态络合铝、酸溶无机铝和腐殖酸铝是油茶林土壤中含量较高的活性铝,三者占可提取活性铝总量的75%以上。湖南地区油茶老叶铝含量为8.277~15.890 g/kg,嫩叶铝含量为4.097~7.451 g/kg,老叶铝含量显著高于嫩叶。油茶嫩叶中的铝含量与土壤中的可交换铝和有机态络合铝含量呈极显著正相关,而油茶老叶中的铝含量只与土壤的有机态络合铝含量呈极显著正相关。

Contents and chemical forms of aluminum in Camellia oleifera forest soils

In order to study on the relationship between chemical forms and contents of aluminum in Camellia oleifera forest soils and the aluminum contents in C. oleifera leaves, the contents and chemical forms of aluminum in soils and the aluminum contents in leaves from 14 C. oleifera forests in Hunan province were determined. The results showed that there was no significant differences between total aluminum contents in rhizosphere soils and 0-20 cm soil layer. The aluminum contents at different chemical forms had obvious differences, and the order based on the contents from high to low was Or-Al, In-Al, Ha-Al, Ex-Al, Hy-Al, and the Or-Al, In-Al and Ha-Al were the main forms in C. oleifera forest soils, which were over 75% in the total active aluminum. The aluminum content in leaves ranged from 8.277 g/kg to 15.890 g/kg for old leaves and from 4.097g/kg to 7.451 g/kg for tender leaves. The aluminum content in old leaves was significantly higher than that in tender leaves. The aluminum content in tender leaves was significantly correlated with the contents of Ex-Al and Or-Al, but that in old leaves were only significantly correlated with Or-Al content.