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应用放射性同位素示踪技术研究了大田冬小麦根系吸收活力的空间分布及其变化动态,结果表明,大田冬小麦根系吸收活力的增加与降低,在水平方向上是按由近及远,垂直方向上是从上到下,在整个土体空间内是从里到外的顺序进行的,到黄熟时表现为整个根系群体全面衰亡。根系吸收活力的空间扩展与根系的形态建成范围相一致。从起身到黄熟前平均有85％的根系吸收活力分布在水平幅度0～20cm垂直深度20cm左右的土体中,它对整个大田根系吸收活力影响最大,这不仅表现在其根系吸收活力数值的高低变化上,且其分布比例在开花后也显著降低,其外围根系吸收体活力数值和分布比例的降低幅度则相对较小。
The spatial distribution and dynamic changes of root absorption activity of winter wheat in field were studied by radioisotope tracer technique. The results showed that the root absorption activity of winter wheat in field was increased and decreased in the horizontal direction from near to far and in vertical direction from From top to bottom, in the entire soil space is from the inside to the outside of the order, to Huangshu when the entire root system showed the full demise. The spatial expansion of root resorption activity is consistent with the range of root morphology. From the beginning to the yellow ripening, 85% of the root absorption vigor distributed in the soil with the horizontal amplitude of 0 ~ 20cm vertical depth of 20cm, which had the greatest influence on the root activity of the whole field, which was not only reflected in the root absorption activity Changes in the distribution, and the proportion of its distribution is also significantly reduced after flowering, its peripheral root absorbance activity values and distribution of the proportion of the decrease is relatively small.