||Takuo Hishi, Saori Fujii, Seikoh Saitoh, Tomohiro Yoshida, Motohiro Hasegawa, Taxonomy, distribution and trait data sets of Japanese Collembola, Ecological Research, 10.1111/1440-1703.12022, 34, 4, 444-445, 2019.07.
||Yuka Maeda, Naoaki Tashiro, Tsutomu Enoki, Rieko Urakawa, Takuo Hishi (Corresponding Author), Effects of species replacement on the relationship between net primary production and soil nitrogen availability along a topographical gradient
Comparison of belowground allocation and nitrogen use efficiency between natural forests and plantations, Forest Ecology and Management, 10.1016/j.foreco.2018.03.046, 422, 214-222, 2018.08.
||Takuo Hishi, Naoaki Tashiro, Yuka Maeda, Sachiko Inoue, Kei-ichiro Cho, Kouhei Yamauchi, Takehito Ogata, Tetsuya Mabuchi, Soil depth distribution in soil and the patterns of alpha- and beta-diversity of families of soil Collembola in cool-temperate deciduous natural forests and larch plantations of northern Japan., Edaphologia, 91, 9-20, 2012.12.
||Seikoh Saitoh, Takuo Hishi, Akinori Yamada, Nobuhiro Kaneko, Hiroshi Takeda, Impact of deer overabundance on oribatid mite communities in a cool temperate forest ecosystem. , Edaphologia, 87, 21-31, 2010.12.
||Hishi, T., Maeda Y., Tashiro N. (2010) Characteristics of soil and soil macro-fauna in relation to slope directions in cool temperate natural forests and larch plantations of Ashoro Research Forest. Bulletin of the Kyushu University Forests. 91:1-6.
||Maeda, Y., Hishi, T., Tashiro, N., Mabuchi, T., Inoue, S., Cho, K., Yamauchi, K., Ogata, T., Kume, A. (2010) Tree species composition according to different slope direction and position on the slope in the cool temperate natural deciduous forests and larch plantations of Ashoro Research Forest. Bulletin of the Kyushu University Forests. 91:7-14..
||Hishi, T., Ikezaki, S., Enoki, T. (2009) Effect of understory vegetations on species richness of oribatid mites in abandoned Chamaecyparis obtusa plantation within Ochozu watershed. Edaphologia. 84:11-20..
||Takuo Hishi, Heterogeneity of individual roots within the fine root architecture
Causal links between physiological and ecosystem functions, Journal of Forest Research, 10.1007/s10310-006-0260-5, 12, 2, 126-133, 2007.04, This review covers the heterogeneity in functions within the fine root architecture in order to clarify the multiple functions of fine roots. Many fine root characteristics, such as anatomy, physiology, morphology, and their consequences for the ecosystem, differ among root ages and ontogenetic branching hierarchies. Individual root age can be characterized by tissue development, with the main tissues developing from primary to secondary tissues. The physiological characteristics of individual roots, such as absorptivity and respiration rates, decrease with increasing branching order, mainly because of aging and tissue development. The C/N ratio and lignin and suberin contents also increase with branching order because of root aging. Morphological characteristics, such as diameter and specific root length, differ among root orders because of both aging and ontogenetic differences. The mortality of individual roots differs among branching orders and root diameters. The life cycles of roots in the fine root architecture, that is, ephemeral and perennial, indicate ontogenetic differences in functions and demographic traits, similar to those for leaves and branches in shoots. In addition, differences in individual root life cycles may affect the root chemical composition, in turn, affecting the decomposition rate. Future studies should seek to identify heterorhizic units in mortality related to anatomical, physiological, and morphological differences for various species. The decomposition processes of each mortality unit within the fine root architecture are also important in understanding the link between physiological and ecosystem functions..
||Takuo Hishi, Hiroshi Takeda, Dynamics of heterorhizic root systems
Protoxylem groups within the fine-root system of Chamaecyparis obtusa, New Phytologist, 10.1111/j.1469-8137.2005.01418.x, 167, 2, 509-521, 2005.08, • 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..
||Takuo Hishi, Muneto Hirobe, Ryunosuke Tateno, Hiroshi Takeda, Spatial and temporal patterns of water-extractable organic carbon (WEOC) of surface mineral soil in a cool temperate forest ecosystem, Soil Biology and Biochemistry, 10.1016/j.soilbio.2004.04.030, 36, 11, 1731-1737, 2004.11, Water-extractable organic carbon (WEOC) drives the C and N cycles in forest ecosystems via microbial activity. However, few studies have considered both then spatial and temporal patterns of WEOC in forest soils. We investigated the spatial and temporal variation in WEOC along a topographic sequence in a cool temperate deciduous forest. The concentrations of WEOC, carbohydrates, total phenols, and other organics were 126±51, 40±15, 1.5±0.5 and 85±43 mg Ckg dry soil-1, respectively. Carbohydrates and phenols accounted for 33±11 and 1.5±1.0% of WEOC, respectively. The effect of season on the WEOC concentration was stronger than that of slope position the growing season, although most of the soil properties varied markedly with slope position. The concentration of carbohydrates in WEOC showed similar seasonal patterns across slope positions. The carbohydrate concentration peaked in May and August. The results suggest that carbohydrates are controlled by the recent production of C, rather than by organic C that has accumulated in soil..