The study looked at different ways of growing trees and grass together in Zhuanglang county to see how well they held onto water in dry conditions. By using special tools in the field, the researchers found that some combinations of trees and grass could hold more water than others. The model with Prunus armeniaca and Onobrychis viciacfolia was the best at holding water and surviving drought, while the model with Pinus tabulaeformis and Medicago Sativa was not as good at supplying water. Overall, the study showed that certain combinations of trees and grass can help soil retain water better in low-suction conditions.