钙离子浓度对青檀生长和檀皮质量的影响

以Hoagland完全营养液为基质，利用5、10和15mmol·L^-13个Ca^2+浓度处理水平及一个无钙对照处理。对青檀苗木各生物组分积累的钙含量、生物量、密度、纤维长度、纤维宽度和纤维素含量进行测定分析．结果表明。对照处理下的青檀苗大部分死亡，且生长不良，其高生长量仅为有钙处理的50％左右；在有钙处理中，青檀一年苗的高生长和生物量差异不明显，但以10mmol·L^-1钙处理浓度的生长量和生物量最大；Ca^2+促进了根、叶和檀皮中钙的积累，并随着Ca^2+浓度的增加而提高，其分布为根>叶>檀皮；浓度钙处理对青檀木质部和檀皮密度、青檀木质部和檀皮的纤维形态影响不显著，其中10mmol·L^-1钙处理下木质部纤维长度和宽度最大，5mmol·L^-1钙处理下檀皮的纤维长度和长／宽比最大；不同钙处理间，檀皮(韧皮部)纤维均在2．0mm以上，檀皮的纤维长／宽比约为木质部长宽比值的4倍；浓度钙处理对青檀木质部和檀皮中纤维素含量有显著影响，且均以10mmol·L^-1。钙处理下纤维素含量最高．

Effect of Ca2+ concentration in the growth and bark quality of Pteroceltis tatarinowii

Hoagland nutrient solutions with three Ca2+ concentration levels (5, 10 and 15 mmol x L(-1)) and a control (no Ca) were used to culture Pteroceltis tatarinowii seedlings. The results indicated that in the control, most seedlings were dead and the survived seedlings were grown poorly, while in three Ca2+ concentration treatments, there were no significant differences in seedling height growth and biomass by the end of the experiment. The Ca content in the root, leaf and bark of Pteroceltis tatarinowii increased with increasing Ca2+ concentrations, and ranked as root > leaf > bark. Ca treatments had no significant effects on the wood and bark density and the fiber shape traits of one-year seedlings. However, the wood fiber length was the longest and the wood fiber width was the widest at the 10 mmol x L(-1) Ca2+ concentration treatment, while the bark fiber length and the ratio of fiber length to fiber width were the best at the 5 mmol x L(-1) Ca2+ concentration treatment. Among the three Ca2+ concentration treatments, the bark fiber length was over 2 mm, and the ratio of fiber length to fiber width was much higher (about 4 times) than that of the wood. There was a significant difference in cellulose contents of wood and bark of one-year seedlings among the three Ca2+ concentration treatments, and the highest cellulose content was achieved at the 10 mmol L- Ca2+ concentration treatment. These results provided some information for the improvement of the growth and bark quality of Pteroceltis tatarinowii grown on non-limestone soil.