国外对树木细根的研究动态

Overseas Researches on Tree Fine Root

森林生态系统的研究已经深入到了生态系统的各个层次,但无论是在哪一层次上的研究,其重点往往是树木的地上部分,而对地下部分——根系的研究相对较为薄弱。主要原因是对根系的生态学作用认识不足以及根系研究的困难。近来,随着对根系特别是细根在养分循环及能流中的重要作用的认识,细根的研究已成为森林生态系统研究的一个热点。根系中粗根(直径>5mm)

The growth and decomposition of tree fine roots play an important role in energy flow and nutrient cycling of forest ecosystem. This paper reviews the methods in studying the dynamics of fine roots,factors influencing fine root growth and death,relationship between fine root turnover and forest productivity,and role of fine root decomposition in nutrient cycling of forest ecosystem.Finally,some new fields are suggested for further research on tree fine roots.