J Integr Plant Biol. ›› 2001, Vol. 43 ›› Issue (4): 385-388.

• Research Articles • Previous Articles     Next Articles

Influence of CO2 Doubling on Water Transport Process at Root/Soil Interface of Pinus sylvestriformis Seedlings

HAN Shi-Jie, ZHANG Jun-Hui, ZHOU Yu-Mei, WANG Chen-Rui, ZOU Chun-Jing   

Abstract:

Water transport at the root/soil interface of 1 year old Pinus sylvestris Linn. var. sylvestriformis (Takenouchi) Cheng et C. D. Chu seedlings under CO2 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 CO2 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.

C02倍增对长白赤松幼苗根-土界面水分运输过程的影响
韩士杰 张军辉 周玉梅 王琛瑞 邹春静
(中国科学院陆地生态过程开放实验室,沈阳110015)

摘要: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C02倍增条件下一年生的长白赤松(Pinussylvestris Linn. var. sylvestriformis (Takenouchi) Chenget C.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,且对土壤无破坏。
关键词: C02倍增;长白赤松幼苗;根-土界面;水分运输;土壤电导率

 

Key words: CO2 doubling, Pinus sylvestris var. sylvestriformis seedlings, root/soil interface, water transport, electric conductance of soil

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