Effects of Ca^2＋concentrations on accumulations of mineral elements in the components of Pteroceltis tatarinowii
摘要
The bark of Pteroceltis tatarinowil is a raw material for manufacturing Xuan Paper.The effects of Ca^2+concentrations on the accumulation of mineral elements in the bark,leaf and root of Pteroceltis tatarinowil were studied under controlled conditions.The types of Hoagland nutrient solution with three Ca^2+ concentrations levels(200,400 and 600μg·g^-1) and a control (without Ca^2+) were designed to culture Pteroceltis tatarinowii.After 6 months,contents of seven mineral elements including Ca,K,Mg,Mn,Zn,Cu and Na in the root,leaf and bark were analyzed.The results indicated that Ca accumulations content in the root,leaf and bark had positively relation with Ca^2+ concentrations (200,400,600μg·g^-1),and the order of the Ca content in the three components was root>leaf>bark.Ca content in the root treated with 600μg·g^-1 Ca^2+ concentration was 5.5 times as high as that of the control,and about 1.4 times as high as that of the root treated in 200 and 400μg/g Ca^2+ concentrations respectively.On the contrary,K and Mg contents in the root,leaf and bark were negatively related to Ca^2+ concentrations,especially in the bark,and their accumulation trend followed the order of leaf>rool>bark.K content in the bark treated with 600μg·g^-1 Ca^2+ concentrations was 39.3% of that of the control,and was 79.0% and 91.8% of the of the bark treated with 200μg·g^-1 and 400μg·g^-1 Ca^2+ concentrations respectively;Mg content in the bark treated with 600μg·g^-1 Ca^2+ concentrations was 23.4% of that of the control,and was 27.1% and 35.4% of that of the bark treated with 200and 400μg·g^-1 Ca^2+ concentration respectively.Compared with the control,the general tendency of Mn,Zn and Cu content decreased with increasing of Ca^2+ concentrations and their contents were in the order:root>leaf>bark.Based on the results of this study,the experiment has been useful for providing academic bases in improving the bark quality of Pteroceltis tatarinowii on non-limestone soil.?A