## 5 Conclusions and Future Works  
In the case study, the collaborators of this park project were mainly landscape designers, project managers, and maintenance staff of the landscape. On the basis of the construction management framework proposed in this paper, landscape designers could use the three-dimensional design for intelligent design of landscapes. Project managers could also benefit from the proposed method as it allows them to provide guidance at remote locations. Moreover, maintenance staff could carry out plant maintenance activities much more effectively using the collected maintenance information. In conclusion, the established informationized construction and management system for landscapes was proven to be able to tackle the following challenges in ensuring sustainable landscape ecology:  
1. The proposed method integrated multiple parametric design tools (e.g., CAD, Excel, Revit, and Dynamo) for the parametric creation of the full-attribute refined model at the precise location, as well as parametric assignment of the corresponding model code. Thus, the cumbersome problem of BIM plant model creation was successfully solved. 2. The proposed method encapsulated massive virtual data of the established BIM model into the Hololens2 device for achieving real-time data transmission at the job site. Thus, the problem of the disconnection between the job site and the model data was successfully solved. 3. The proposed method achieved a collaborative model design platform by connecting multiple Hololens2 devices. Thus, the problem of conflicts in multi-disciplinary designs was successfully solved. 4. The proposed method encapsulated maintenance information of various plant types at different growth stages (e.g., maintenance time, maintenance methods) into the Hololens2 device for achieving effective tracing of the historical maintenance information of the plants on site. Moreover, the information-based scientific maintenance with animation guidance is realized. Thus, the problem of inadequate maintenance of landscape plants was successfully solved. Figure 13: Interactive projection of virtual model on real landscape. In summary, the proposed method enables effective model creation and visualization of various plants. All landscape-related personnel could participate in design, construction, and maintenance processes and communicate with field landscape staff in time to provide more scientific and reasonable planting and maintenance practices for landscape management. Thus, the integrated use of BIM and MR for construction and management of landscapes could help to improve the efficiency of (1) collaboration among multiple landscape personnel and (2) plant construction and management. The proposed method has pointed out the direction for the digital combined application of BIM and MR technology in the landscape. Limitations still exist in the proposed method. For example, the proposed framework proposed is mainly used for shrubs, trees, and other perennial woody plants in landscapes. The proposed method might not be suitable for small herbs, vines, ferns, and other similar plants. Further exploration is still necessary if the complete landscape is visually displayed on Microsoft devices. Conceptualization, X.Z. ; data curation, Y.G., M.Z. and L.H. ; formal analysis, Y.G., L.Y. and S.W. ; funding acquisition, X.Z. ; investigation, M.Z. and L.H. ; methodology, X.Z. ; project administration, J.W. and C.H. ; resources, Y.Z. ; software, Y.Z. ; supervision, J.W. and C.H. ; validation, J.W. and C.H. ; visualization, L.Y. and S.W. ; writing--original draft, M.L. and Z.S. ; writing--review and editing, M.L. and Z.S. All authors have read and agreed to the published version of the manuscript. This research was funded by the Ministry of Housing and Urban-Rural Development grant number 2017-R3-005, and the APC was funded by Beijing University of Technology. Not applicable.