# A Digital Framework to Predict the Sunshine Requirements of Landscape Plants
## 3 Results and Discussion  
### Plant Health Level Response to Solar Radiation  
The reason why the health level of landscape plants responds to solar radiation is that the amount of solar radiation flux determines the accumulation of photosynthetic substances, such as carbohydrates [67]. Therefore, the same plant in different solar radiation environments will show a different health status. The results depicted in Supplementary Materials show that there is a diverse range of health responses to solar radiation among the 15 species of landscape plants. Therefore, if the designer chooses different plant species for urban greening and forestry, this would increase the likelihood of plant health problems. One obvious phenomenon is that the health of _Podocarpus macrophyllus_ (Thunb.) [PERSON] and _Aucuba japonica_ var. variegata D'Om-Brain is not affected by changes in solar radiation, based on our findings (no. 2 and no. 4 in Supplementary Materials), especially the PPF values of 16-120 umol/m\({}^{2}\)-s and 9-325 umol/m\({}^{2}\)-s, respectively. Therefore, it can be inferred that these plants have a wide range of applications for diverse solar radiation environments. Nevertheless, the literature [68] revealed that different solar radiation levels can affect root soil temperature and water content, thereby affecting plant growth. However, this factor is difficult to consider in a natural experiment. The small number of plant samples may also be an important reason for the two plant species, which will affect the fitted curve. In order to explore this linear law, the scope of investigation should be expanded in future research, even between different cities to obtain more sufficient data. _Cercis chinensis_ [PERSON], _Mahonia fortunei_ ([PERSON].) [PERSON], _Nandina domestica_ [PERSON], _Ligustrum quilhoui_ [PERSON], and _Loropetalum chinense_ var. rubrum [PERSON] (nos. 1, 6, 7, 8, and 10 in Supplementary Materials) show more significant responses to changes in PPF. The five plant species show PPF thresholds of 78 umol/m\({}^{2}\)-s, 78 umol/m\({}^{2}\)-s, 10 umol/m\({}^{2}\)-s, 150 umol/m\({}^{2}\)-s, and 77 umol/m\({}^{2}\)-s, respectively, for the transition from the sub-healthy to healthy status when the other ecological factors are the same. To this end, mapping the laws \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Function** & & **Specific Name** \\ \hline \(\cdot\) & Recording and drawing & \(\cdot\) & Sample survey form, image maps of the study area \\ \(\cdot\) & Image acquisition & \(\cdot\) & Digital camera (Nikon COOLPIX SS100), smartphone \\ \(\cdot\) & Measurement and analysis of physiological & \(\cdot\) & LI-6400 XT Portable Photosynthetic System (Li-Cor Inc.) \\ & indices & \(\cdot\) & SPAD 502 Plus Chlorophyll Meter \\ \(\cdot\) & Measurement of environmental light & \(\cdot\) & LightScout Quantum Meter (Spectrum Technologies USA Inc., model: QMSS-S) \\ \(\cdot\) & Simulation and analysis of solar radiation & \(\cdot\) & Solar Analyst model, ArcGIS 10.2 for desktop, ESRI. \\ \(\cdot\) & Distance measurement and parameter & \(\cdot\) & Total station \\ \(\cdot\) & correction & \(\cdot\) & Tape measure \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Equipment and techniques were used in this study. of health responses is very valuable information for adaptive plant selection and configuration based on the spatial pattern of solar radiation, especially when supported by digital technology, such as geographic information systems and decision support systems [20; 21]. The health level is irregular in response to solar radiation for some plant species, such as _Rhododendron simsii_ [PERSON], _Euonymus japonicus_ var. alba-marginata T. [PERSON], _Ophiiopgon bodinieri_ [PERSON], and _Zoysia matrella_ (L.) [PERSON], especially the transition from unhealthy to sub-healthy (nos. 9, 11, 13, and 15 in Supplementary Materials).