4.5 Article

A quantitative evaluation of soil mass held by tree roots

Journal

TREES-STRUCTURE AND FUNCTION
Volume 35, Issue 2, Pages 527-541

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s00468-020-02054-y

Keywords

Disaster; Root anchorage; Root– soil plate; Tree stability; Uprooting; Windthrow

Categories

Funding

  1. KAKENHI Grant from the Japan Society for the Promotion of Science [JP20H03040, JP20H03028]
  2. Program to supporting research activities of female researchers - MEXT Special Coordination Fund for Promoting Science and Technology

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The soil held by tree roots is significantly heavier than the tree biomass, helping to balance the weight above and belowground. Actual measurements of root-soil plate mass show that soil plays a crucial role in overall tree mass. Aboveground allometric indices are useful for estimating belowground mass to understand tree anchorage.
Key message Tree roots hold soil that is dramatically heavier than the tree biomass, wet or dried. This soil might compensate for the imbalance between above- and belowground mass. Root-soil plates are recognized to play an important role in root anchorage of plate-like root system, however, actual measurements of their mass have rarely been reported. Even though the root-soil plate mass is often estimated using aboveground allometric indices, no research confirms the validity. Seven root-soil plates of Cryptomeria japonica fallen by Typhoon Jebi were divided into roots and soil, and their weights were directly measured. Mass of the seven plates ranged from 251 to 3070 kg on a dry basis. Roots accounted for 8% of total plate mass and soil for 92%. The mass of the soil held in the plates was 2.8 times greater than tree biomass. The root-to-shoot biomass ratio was 0.26, whereas the ratio of root-soil plate mass to shoot biomass was 3.9, meaning that the root-soil plate mass was much greater than aboveground biomass. These results suggest that the soil mass held in the plate is the main component of whole-tree mass including the plate. The root system holds soil weighing as much as 13 times the root system's mass. The soil might balance the aboveground weight of the tree by adding mass. Aboveground allometric indices are good indicators of root-soil plate mass and allow the belowground mass to be estimated to understand tree anchorage without soil disturbance.

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