Dynamics of heterorhizic root systems: Protoxylem groups within the fine-root system of Chamaecyparis obtusa

Takuo Hishi, Hiroshi Takeda

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

• To understand the physiology of fine-root functions in relation to soil organic sources, the heterogeneity of individual root functions within a fine-root system requires investigation. Here the heterogeneous dynamics within fine-root systems are reported. • The fine roots of Chamaecyparis obtusa were sampled using a sequential ingrowth core method over 2 yr. After color categorization, roots were classified into protoxylem groups from anatomical observations. • The root lengths with diarch and triarch groups fluctuated seasonally, whereas the tetrarch root length increased. The percentage of secondary root mortality to total mortality increased with increasing amounts of protoxylem. The carbon : nitrogen ratio indicated that the decomposability of primary roots might be greater than that of secondary roots. The position of diarch roots was mostly apical, whereas tetrarch roots tended to be distributed in basal positions within the root architecture. • We demonstrate the heterogeneous dynamics within a fine-root system of C. obtusa. Fine-root heterogeneity should affect soil C dynamics. This heterogeneity is determined by the branching position within the root architecture.

Original languageEnglish
Pages (from-to)509-521
Number of pages13
JournalNew Phytologist
Volume167
Issue number2
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

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