不同水分条件下银叶椴根系的分形特征

Fractal characteristics of Tilia tomentosa's root system under different water conditions

应用分形理论研究植物根系的形态结构特征和生理功能。通过对不同水分条件下4年生盆栽银叶椴根系的分形维数值及根丰度和根系长度等进行研究发现:水涝处理根系的分形维数值最小,干旱胁迫也使分形维数变小,先干旱后复水促使维数值变大。随着水分胁迫程度的增加,银叶椴的根丰度变小,但差异不显著,根系长度变小并且各处理之间差异显著。同时分析在不同水分条件下根系活力的变化,并对根系活力与分形维数值及根丰度和根系长度等进行了相关分析,结果表明根系活力与这些指标都呈显著的正相关关系。

Fractal theory was used to investigate the configuration characteristic and physiological function of root system. Fractal dimension （FD）, root system abundance and root system length of Tilia tomentosa seedlings potted four-year-old were studied under different water levels. The results showed that the value of FD in waterlogged treatment was the smallest in all treatments. The value of FD decreased under drought stress, and which increased when root system was drought at beginning and then watering. With the enhancement of drought stress intensity, the root system abundance of Tilia tomentosa was decreasing, but the differences among different treatments were not significant. The root system length was also decreasing but the differences among different treatments were significant . The changes of root system vigor under different water conditions were studied, and the correlation of root system vigor with fractal dimension （ FD）, root system abundance and root system length was analyzed. The results indicated that the root system vigor was strongly positive relation to those indices.