摘要
Water transport at the root/soil interface of 1 year old Pinus sylvestris Linn. var. sylvestriformis (Takenouchi) Cheng et C. D. Chu seedlings under CO 2 doubling was studied by measuring soil electric conductance to survey soil water profiles and comparing it with root distribution surveyed by soil coring and root harvesting in Changbai Mountain in 1999. The results were: (1) The profiles of soil water content were adjusted by root activity. The water content of the soil layer with abundant roots was higher. (2) When CO 2 concentration was doubled, water transport was more active at the root/soil interface and the roots were distributed into deeper layer. It was shown in this work that the method of measuring electric conductance is an inexpensive, non_destructive and relatively sensitive way for underground water transport process.
用具有非破坏性的电导率方法测定土壤水分的廓线 ,与挖掘法 (或打孔法 )获取的根系分布对比 ,研究CO2倍增条件下一年生的长白赤松 (PinussylvestrisLinn .var.sylvestriformis (Takenouchi)ChengetC .D .Chu)幼苗根 土界面的水分运输状态。结果表明 :(1)土壤水分廓线由植物的活性所调制 ,根系分布密集的土层其水分含量也高。(2 )CO2 倍增 ,根系 土壤水分运输的活跃层及根系分布都将向土壤深处位移。研究证明 ,电导率方法能够指示发生于根 土界面上的水分运输状态 ,方法简单 。
基金
Supportedbythe"HundredScientists"ProjectofTheChineseAcademyofSciencesandtheNationalNaturalScienceFoundationofChina (30 0 70 15
