## 3 Results and Discussion
### Plant Growth  
Three kinds of plants were cultivated in planting containers after the void ratio, alkalinity, and mechanical property tests were performed. Twenty-seven planting containers were divided into three groups with three replicates per sample: small-particle concrete (SC), large-particle concrete (LC), and nonconcrete (NC). Figure 3 shows the average temperature as an environmental factor over the test duration. The weekly average maximum temperature was 25.2 \({}^{\circ}\)C, and the weekly average minimum temperature was 16.9 \({}^{\circ}\)C. The vegetation test began on 1 st April and ended in late June, accounting for a total of 12 weeks. _C. dactylon_ began to sprout in the first week and grew to form a patch of grass with sparse shoots, most of which reached 4.0 cm, while few roots reached approximately 5.0 cm. _A. stolonifera_ spouted in the second week, and the growth rate of the aboveground tissue was significantly lower than that of _C. dactylon_, approximately 0.5-2 cm. _S. argenteostriatus_ in all containers changed little in the first two weeks except for several underground bamboo root shoots that germinated. Figure 4 shows the phenomenon whereby the aboveground \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline  & & \multicolumn{2}{c}{**Compressive**} & \multicolumn{2}{c}{**Alkalinity**} & \multicolumn{2}{c}{**Void Ratio**} & \multicolumn{2}{c}{**MDA**} & \multicolumn{2}{c}{**Pro**} & \multicolumn{2}{c}{**REC**} & \multicolumn{1}{c}{**SP**} & \multicolumn{1}{c}{**Chl**} \\ \hline Compressive & Pearson Test & 1 & & & & & & & & \\ Strength & Sig. & & & & & & & & & \\  & Pearson Test & 0.090 & 1 & & & & & & & \\  & Sig. & 0.804 & & & & & & & & \\  & Pearson Test & \(-\)0.010 & \(-\)0.757 \({}^{\ast}\) & 1 & & & & & & \\  & Sig. & 0.979 & 0.011 & & & & & & & \\  & Pearson Test & 0.280 & 0.918 \({}^{\ast\ast}\) & \(-\)0.811 \({}^{\ast\ast}\) & 1 & & & & & \\  & Sig. & 0.466 & 0.000 & 0.008 & & & & & & \\  & Pearson Test & \(-\)0.244 & 0.217 & \(-\)0.234 & 0.065 & 1 & & & & \\ Pro & Sig. & 0.527 & 0.575 & 0.545 & 0.869 & & & & & \\  & Pearson Test & 0.084 & 0.869 \({}^{\ast\ast}\) & \(-\)0.857 \({}^{\ast\ast}\) & 0.941 \({}^{\ast\ast}\) & 0.320 & 1 & & \\  & Sig. & 0.830 & 0.002 & 0.003 & 0.000 & 0.400 & & & & \\  & Pearson Test & 0.127 & 0.815 \({}^{\ast\ast}\) & \(-\)0.594 & 0.802 \({}^{\ast\ast}\) & 0.527 & 0.861 \({}^{\ast\ast}\) & 1 & \\ SP & Sig. & 0.745 & 0.007 & 0.092 & 0.009 & 0.145 & 0.003 & & & \\  & Pearson Test & 0.155 & 0.729 \({}^{\ast}\) & \(-\)0.547 & 0.711 \({}^{\ast}\) & 0.613 & 0.800 \({}^{\ast\ast}\) & 0.9690 \({}^{\ast\ast}\) & 1 \\ Chl & Sig. & 0.691 & 0.026 & 0.128 & 0.032 & 0.079 & 0.010 & 0.000 & \\ \hline \end{tabular}  
* Indicates a significant correlation at the 0.05 level (bilateral). ** Indicates a significant correlation at the 0.01 level (bilateral).  
\end{table} 
Table 5: Correlation coefficients between physical indexes and plant physiological indexes, \(n=9\) (Group SC). Figure 3: Chart of the average temperature during the vegetation test. length and growth rate of the three kinds of plants in SC, LC, or NC were similar in the initial two weeks. The growth of the three plants varied notably starting from the third week. One convincing explanation is the natural growth pattern of the plants themselves and the warmer climate. _C. dactylIon_ was the fastest growing plant among the tested species. It began to grow faster in the third week, and the aboveground height was approximately 30-35 cm in the sixth week. The average heights in NC and SC were larger than those in LC, and at the end of the sixth week, _C. dactylIon_ reached the biomass limit that the containers could bear. The plants were moved once to encourage growth during the rest of the experiment. The growth rate decreased in the last three weeks, as shown in Figure 4a. One of the reasons was the rising temperature, which opposed their preference for a cooler climate. The biomass and plant length of the different treatments of _A. stolonifera_ increased steadily over the study period.