柄扁桃根系水分共享特性研究

Water Sharing in the Roots of Prunus Pedunculata Maxim

研究了沙地灌木柄扁桃根系的水分共享状况.结果表明,柄扁桃根系具有水分共享的潜力,在土壤水分分布不均匀的条件下,若主根水分相对丰富而侧根水分相对匮乏,则水分可以由主根转移到侧根中;若侧根水分相对丰富而主根水分相对匮乏,则水分可以由侧根转移到主根中,主根中的水分可以进行反向运输;若土壤水分分布均匀,则根系水分由侧根向主根转移,在主根中水分由形态学上端向下端转移,以保证对地上部分的水分供应.

Roots water sharing of sandy shrub Prunus pedunculata Maxim. was studied in this paper. The results showed that a potential for water sharing exists in the root system of pedunculata. When water distribution uneven,branch roots which are deficit water can share the water absorbed by main roots. At the same time, the water could be transported from branch roots which are contend abundant water to main roots which was relative dehydration. If the soil water distribution was uniform, root system water would be transported from branch roots to main roots, and in the main roots, the water was transported from motphological upper point to morphological low point, so that to insure the water supply of shoot.