Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： In order to explore the influence of gravel content of soil on the growth and root of the rare and endangered plant Handeliodendron bodinieri seedlings, one month age of H. bodinieri seedlings were used as materials and five pot experiments with different soil gravel contents (0% (CK), 20%, 40%, 60% and 80%) were carried out and the most suitable soil gravel content for the growth of H. bodinieri seedlings were selected. The results were as follows: (1) The gravel content of soil were highly significant influence on the growth of H. bodinieri seedlings. Seedling height and ground diameter of relative growth rate, leaf area, seedling quality index, biomass (root, leaf and whole plant) and root-shoot ratio were all maximum when gravel content was 40%. (2) The gravel content of soil had a very significant influence on root morphology of H. bodinieri seedlings. The total root length and root surface area all reached the maximum when gravel content was 40%. However, the root average diameter decreased with the increase of the gravel content, and the minimum root average diameter was the gravel content of soil of 80%. (3) The gravel content of soil had no obvious influence on root topological architecture and fractal characteristic of H. bodinieri seedlings, but were very significant influence on root average link length and root forks numbers. Root topological index (TI), modified topological index (qa, qb) all tended to be 1 in every treatment, so the branching pattern of the roots of H. bodinieri seedlings was close to fishtail branching in different gravel contents of soil. The root average link length increased first and then decreased with the increase of gravel content, and reached the maximum at 40% gravel content. The root forks number of H. bodinieri seedlings showed a gradually decreasing growth trend with the increase of gravel content. (4) According to the results of comprehensive evaluation of the seedlings growth, root morphology and architecture , the H. bodinieri seedlings had the best growth status in the gravel content of soil of 40%. Therefore, adding a suitable amount of gravel in the soil can promote the growth of H. bodinieri seedlings. The seedling growth status and seedings quality index were the best under the treatment of gravel content of 40%. The gravel content of 40% is the most suitable for the growth of H. bodinieri seedlings.
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