Changes in the anatomy, morphology and mycorrhizal infection of fine root systems of Cryptomeria japonica in relation to stand ageing 日本柳杉细根系统解剖形态及菌根感染与林分老化的关系.pdfVIP

Tree Physiology 37, 61–70 doi:10.1093/treephys/tpw076 Research paper Changes in the anatomy, morphology and mycorrhizal infection of fine root systems of Cryptomeria japonica in relation to stand ageing 1,6 2 2,3 4 5 Takuo Hishi , Ryunosuke Tateno , Keitaro Fukushima , Reiji Fujimaki , Masami Itoh and Naoko Tokuchi2 1Shiiba Research Forest, Kyushu University, 949 Ohkawauchi, Shiiba-son, Miyazaki 8830402, Japan; 2Field Science Education and Research Center, Kyoto University, Kyoto 6068502, Japan; 3Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 11-Minamiohsawa, Hachijoji, Tokyo 1920397, Japan; 4Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawazu-cho, Matsue, Shimane 6908504, Japan; 5OYO Corporation, 24-66 Tagawa-Kita, Yodogawa-ku, Osaka 5320021, Japan; 6Corresponding author (hishi@forest.kyushu-u.ac.jp) Received April 4, 2016; accepted July 12, 2016; published online September 1, 2016; handling Editor Torgny Näsholm Biomass allocation to fine roots often increases under soil nutrient deficiency, but the fine root biomass does not often increase in old stands, even under nutrient limitation. Therefore, in old stands, the morphology, anatomy, branching architecture and mycor- rhization of fine roots may compensate efficiently for nutrient acquisition by the low fine root biomass. In this study, changes in the morphology, anatomy and arbuscular mycorrhizal infection at each branching position of fine root clusters were evaluated in relation to stand age. A chronosequence (6–90 years of age) of stands in a Cryptomeria japonica D. Don plantation was used for these analyses. The fine root size parameters, such as length, weight and tip numbers of fine root clusters, increased with stand age. The specific root tip length (SRTL) decreased with increasing stand a