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J Integr Plant Biol, 2000, 42 (9): 927-930, Research Article
An Improved Technique for Measuring Root Radial Hydraulic Conductivity
HUANG Ming-Bin
doi:
Abstract

根径向水流导度测定技术的改进
黄明斌*  董翠云
(中国科学院、水利部水土保持研究所,陕西杨凌712100)

摘要:根系径向流的水力学性质主要是根的径向水流导度 ,它取决于根径向水流通道的状况。利用改进的现有原位测定根系径向水流导度的蒸腾计技术 ,设计了一个简便的 4室吸水测定装置 ,可一次性获得根木质部水势和根径向水流导度 ,缩短测定时间 10min ,确保测定精度。然后用改进的装置测定了生长在不同水分条件下冬小麦(Triticumaestivum L .)根系的径向水流导度 ,结果显示根系的平均径向水流导度为 4.6 3× 10 -7m·s-1·MPa-1,并随连体植株水分胁迫程度的增大而降低。

关键词: 冬小麦;根;木质部水势;径向水流导度

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