## 3 Results and Discussion
### Statistical Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline  & **Treatment** & **TP** & **RA (\%)** & **TK** & **RA (\%)** & **SOM** & **RA (\%)** & **TN** & **RA (\%)** & **AN** & **m(mg/kg)** & **RA (\%)** & **PH** \\  & **(g/kg)** & **RA (\%)** & **(g/kg)** & **RA (\%)** & **(g/kg)** & **RA (\%)** & **(g/kg)** & **RA (\%)** & **(mg/kg)** & **Value** \\ \hline \multicolumn{2}{c}{Original} & 0.677 & \multicolumn{2}{c}{40.66} & \multicolumn{2}{c}{62.78} & \multicolumn{2}{c}{1.00} & \multicolumn{2}{c}{98.69} & \multicolumn{2}{c}{6.2} \\ \hline \multirow{2}{*}{\(C\)_dactylron_} & NC & 0.196 & 71.0 & 18.17 & 55.3 & 41.91 & 33.2 & 0.84 & 16.0 & 64.78 & 34.3 & 7.6 \\  & SC & 0.203 & 70.0 & 18.13 & 55.4 & 32.90 & 47.6 & 0.67 & 33.0 & 61.53 & 37.6 & 8.1 \\  & LC & 0.208 & 69.2 & 17.30 & 57.4 & 37.30 & 40.1 & 0.66 & 34.0 & 56.04 & 43.2 & 7.8 \\ \hline \multirow{2}{*}{_A._ stololololololololololololumn{2}{c}{_in_fera_}} & NC & 0.196 & 71.0 & 14.37 & 64.6 & 32.90 & 47.6 & 0.26 & 74.0 & 20.49 & 79.2 & 7.6 \\  & SC & 0.193 & 71.4 & 14.40 & 64.6 & 38.77 & 38.2 & 0.81 & 19.0 & 72.01 & 27.0 & 7.9 \\  & LC & 0.197 & 70.9 & 13.30 & 67.2 & 41.70 & 33.6 & 0.65 & 35.0 & 61.18 & 38.0 & 8.1 \\ \hline \multirow{2}{*}{_S. argen- tovstra- tovstra- tovstra_} & NC & 0.185 & 72.6 & 15.57 & 56.8 & 38.35 & 38.9 & 0.74 & 26.0 & 64.79 & 34.3 & 7.7 \\  & SC & 0.213 & 68.5 & 16.30 & 59.9 & 42.12 & 32.9 & 0.81 & 19.0 & 73.84 & 25.1 & 7.8 \\ \hline \multirow{2}{*}{_A._ stolololololololololumn{2}{c}{_in_fera_}} & \multicolumn{2}{c}{1.019} & \multicolumn{2}{c}{71.4} & \multicolumn{2}{c}{18.37} & \multicolumn{2}{c}{54.8} & \multicolumn{2}{c}{41.28} & \multicolumn{2}{c}{34.2} & \multicolumn{2}{c}{0.73} & \multicolumn{2}{c}{27.0} & \multicolumn{2}{c}{76.97} & \multicolumn{2}{c}{22.0} & \multicolumn{2}{c}{8.2} \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Composition of original and after-use soil. Figure 12: Distribution of the weights of different indexes in the first and second principal components in the SC group. Figure 13: Distribution of the weights of different indexes in the first and second principal components in the LC group. According to the plant physiological experiments and the PCA outcome, SP, REC, MDA, alkalinity, and Chl were the main factors responsible for the growth of the SC group being lower than that of the control group. Previous studies have found that plant metabolism takes place in a liquid environment, and the formation of SP in plants means that the plant tissues are going to carry out activities that require greater energy. SP is a component of many important enzymes in plants and is directly related to plant respiration, the decomposition of carbohydrates for energy, the formation of cells, and the catalysis of various chemical reactions [37]. REC is an index that indicates resistance in plants under stress, plant cell membrane permeability changes, and cell penetration in the electrolyte solution and can be used to determine the degree of membrane damage [38]. MDA, as a biomarker of oxidative stress, appears on the first principal component along with alkalinity, indicating that the plants were subjected to saline-alkali stress [39]. SP, REC, and MDA were the main influencing factors in both the LC and SC groups. However, alkalinity plays a different role in the LC group, indicating that it is not as closely related to plant growth in a concrete matrix with a larger particle size. This phenomenon requires more detailed study in the future. As the common components that mainly regulate plant growth, SP, REC, and MDA obviously indicated that the plants growing on large- and small-particle-diameter concrete did not grow as well as those growing in near-natural containers. Plant cultivation observation and physiological indexes revealed that the plants growing on PC were subjected to abiotic stress and were irreversibly damaged, with not only a difference in plant appearance and height but also internal molecular structure. Some scholars have developed this phenomenon through various types of stress trials.