科研之友
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摘要
To investigate the root-soil anchorage strength, a pull-out test is often needed. Because of vegetation diversity and site-specific conditions, each species has its special pattern in the development of root systems. Therefore, there is a desire to provide an appropriate technique that can be adapted to different species. In this study, a penetrometer with minor modification is proposed for the pull-out test. In addition, two types of clamps were designed. To assess the feasibility in the field, four species were tested: maize (Zea mays L.), sunflower (Helianthus annuus L.), sugar beet (Beta vulgaris L) and fat-hen (Chenopodium album). Furthermore, two indices were verified: the peak value of pull-out force, and the work of a complete pull-out course. The statistical results showed that both the shoot heights and stem diameters of maize and sunflower (single-branched plants) were significantly correlated with the peak value of pull-out force (0.871 >= R-2 >= 0.798). Alternatively, the work of the pull-out course was suitable for fat-hen (multi-branched plant) in relation to the root dry mass (R-2 = 0.791). For sugar beet, a weak correlation (R-2 = 0.371) was observed, and the reason is interpreted. In addition, the failure rate of uprooting each species by each clamp is presented.
