Dorairaj Deivaseeno, Suradi Muhammad Fahmi, Mansor Nursyamimi Syafiqah, Osman Normaniza
Institute of Biological Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia.
PeerJ. 2020 Aug 24;8:e9595. doi: 10.7717/peerj.9595. eCollection 2020.
Globally, there has been an increase in the frequency of landslides which is the result of slope failures. The combination of high intensity rainfall and high temperature resulted in the formation of acidic soil which is detrimental to the healthy growth of plants. Proper plant coverage on slopes is a prerequisite to mitigate and rehabilitate the soil. However, not all plant species are able to grow in marginal land. Thus, this study was undertaken to find a suitable slope plant species. We aimed to evaluate the effect of different soil pH on root profiles and growth of three different potential slope plant species namely, , and . showed the highest tolerance to acidic soil as it recorded the highest plant height and photosynthetic rate. The root systems of , and were identified as M, VH- and R-types, respectively. The study proposed which possessed dense and shallow roots to be planted at the toe or top of the slope while and to be planted in the middle of a slope. consistently recorded high root length and root length density across all three types of soil pH while showed progressive increase in length as the soil pH increased. The root average diameter and root volume of outperformed the other two plant species irrespective of soil pH. In terms of biomass, exhibited the highest root and shoot dry weights followed by . Thus, we propose to be planted on slopes as a form of soil rehabilitation. The plant species displayed denser rooting, hence a stronger root anchorage that can hold the soil particles together which will be beneficial for slope stabilization.
在全球范围内，由边坡失稳导致的山体滑坡发生频率有所增加。高强度降雨和高温共同作用导致酸性土壤的形成，这对植物的健康生长有害。在斜坡上有适当的植物覆盖是减轻和修复土壤的前提条件。然而，并非所有植物物种都能在边缘土地上生长。因此，开展了本研究以寻找合适的边坡植物物种。我们旨在评估不同土壤pH值对三种不同潜在边坡植物物种（即[物种一]、[物种二]和[物种三]）根系形态和生长的影响。[物种一]对酸性土壤表现出最高的耐受性，因为它的株高和光合速率最高。[物种一]、[物种二]和[物种三]的根系分别被鉴定为M型、VH型和R型。该研究建议将根系密集且浅的[物种一]种植在坡脚或坡顶，而[物种二]和[物种三]种植在斜坡中部。在所有三种土壤pH值条件下，[物种一]的根长和根长密度始终较高，而[物种二]的根长随着土壤pH值的增加呈逐渐增加趋势。无论土壤pH值如何，[物种一]的根平均直径和根体积均优于其他两种植物物种。在生物量方面，[物种一]的根和地上部分干重最高，其次是[物种二]。因此，我们建议将[物种一]种植在斜坡上作为一种土壤修复形式。该植物物种根系更密集，因此根系锚固力更强，能够将土壤颗粒固定在一起，这将有利于斜坡稳定。
