## 3 Results and Discussion
### Statistical Results
_[PERSON]_ investigated the relationship between the shoot to root ratio (S:R), growth and leaf SP concentration of _Pisum sativum_, _Phaseolus vulgaris_ and _Triticum aestivum_ under different nutrient deficiencies. His results indicated a significant positive correlation between S:R and leaf SP concentration (\(p<0.001\)) [40]. _[PERSON]_ took different qualities of bananas as samples and found that insufficient water supply negatively affected plant relative water content, SP, Chl content, and production [41]. The effect of the concrete matrix on plant productivity and persistence is consistent with the experimental results of [PERSON] [42]. There are two possible explanations for this phenomenon: (1) Certain components, such as alkaline substances in concrete, contaminate the soil and inhibit plant growth. (2) The insufficient soil layer and the low permeability of the matrix cause the plant root system to absorb insufficient nutrition compared to that under natural growing conditions. For instance, the roots of _S. argenteestriatus_ are more developed than those of the other two species because of its  
Figure 14: (**a**) Scree plot for the SC group (**b**) scree plot for the LC group. plant properties; it is therefore considered to be more sensitive to soil nutrient requirements and soil properties. In this study, when the plants were subjected to alkaline stress, the cell membrane was damaged first, resulting in membrane lipid peroxidation, intracellular soluble extravasation, and the accumulation of membrane lipid peroxidation products such as MDA. The accumulation of MDA causes repeated damage to cells, leading to a series of biological and chemical reactions. Plants will increase the content of SP to improve the water retention ability of their cells under stress and thereby enhance their stress resistance. The MDA content of _S. argenteostriatus_ in the SC group was significantly different from that in the other two treatment groups, showing that _S. argenteostriatus_ did not experience significant salinization damage in SC. Saline-alkali stress has a serious negative effect on plant metabolism and appearance. When this situation occurs in slope protection projects, it will greatly affect the landscape effect and increase the risk of soil erosion. Many scholars and engineers have studied the internal mechanisms of plant damage caused by salinized substrates and proposed certain countermeasures. Biological control is an economical and effective way to improve alkalized substrates; microorganisms such as certain bacteria and fungi can effectively improve the physical and chemical properties of salinized substrates [43]. _[PERSON]_ inoculated _Arbuscular mycorrhizal_ fungi into a saline substrate and found that it increased the absorption of N, P, K, and Ca by plants while reducing the absorption of Na, Mg, and CI ions. This resulted in a significant increase in plant biomass and seedling survival [44]. _[PERSON]_ found that _cyanobacteria_ enhance the physical, chemical, and nutritional properties of saline substrates [45]. On the other hand, in both sets of analyses, the Pro parameter was the closest in distance to the determination line. This indicator showed nonsignificant differences in previous interplant comparisons. This also illustrates that this index was not applicable in the current experiment and that the accumulation of Pro by plants under environmental stress is not a suitable indicator of stress in plants. This conclusion is similar to the conclusions of some previous studies [46].