Abstract
Ancient tree community surveys have great scientific value to the study of biological resources, plant distribution, environmental change, genetic characteristics of species, and historical and cultural heritage. The largest ancient pear tree communities in China, which are rare, are located in the Daxing District of Beijing. However, the environmental conditions are tough, and the distribution is relatively dispersed. Therefore, a low-cost, high-efficiency, and high-precision measuring system is urgently needed to complete the survey of ancient tree communities. By unmanned aerial vehicle (UAV) photogrammetric program research, ancient tree information extraction method research, and ancient tree diameter at breast height (DBH) and age prediction model research, the proposed method can realize the measurement of tree height, crown width, and prediction of DBH and tree age with low cost, high efficiency, and high precision. Through experiments and analysis, the root mean square error (RMSE) of the tree height measurement was 0.1814 m, the RMSE of the crown width measurement was 0.3292 m, the RMSE of the DBH prediction was 3.0039 cm, and the RMSE of the tree age prediction was 4.3753 years, which could meet the needs of ancient tree survey of the Daxing District Gardening and Greening Bureau. Therefore, a UAV photogrammetric measurement system proved to be capable when applied in the survey of ancient tree communities and even in partial forest inventories.
Highlights
Ancient trees are the cornerstone of the natural, agricultural, and urban ecosystems on earth [1,2,3,4,5].The investigation of ancient tree communities is of great scientific value to the study of biological resources, plant distribution, environmental change, genetic characteristics of species, and historical and cultural heritage [6,7]
For the purpose of protecting and managing ancient trees, preventing the malicious and illegal felling of ancient trees, and strengthening the information management of ancient trees, the Daxing District Gardening and Greening Bureau hopes to carry out ancient tree communities monitoring every year
The Daxing District Gardening and Greening Bureau can only conduct the survey of ancient pear trees within one month before the Pear Flower Festival every year
Summary
Ancient trees are the cornerstone of the natural, agricultural, and urban ecosystems on earth [1,2,3,4,5].The investigation of ancient tree communities is of great scientific value to the study of biological resources, plant distribution, environmental change, genetic characteristics of species, and historical and cultural heritage [6,7]. In view of the specific situation of the ancient tree community survey, few unique survey patterns have been formed. The traditional forest survey pattern is mainly used in the survey of ancient tree communities. The Daxing District of Beijing has the world’s rarest ancient pear tree communities. For the purpose of protecting and managing ancient trees, preventing the malicious and illegal felling of ancient trees, and strengthening the information management of ancient trees, the Daxing District Gardening and Greening Bureau hopes to carry out ancient tree communities monitoring every year. The Daxing District Gardening and Greening Bureau can only conduct the survey of ancient pear trees within one month before the Pear Flower Festival every year. The high efficiency and real-time performance of the survey of ancient tree communities becomes critical
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