Distributions and Expansions of Derris trifoliata in Lianzhou Bay of Beihai
In order to determine distribution ranges and areas of Derris trifoliata in mangrove areas of Lianzhou bay, Beihai, unmanned aerial vehicle (UAV) technology, literature review and historical remote sensing image analysis were used to explore distributions of D. trifoliata and its expansion rate in Lianzhou bay. Results showed that distribution area of D. trifoliata in intertidal zones of Lianzhou bay was 154.52 hm2, which was mainly concentrated in mangroves near mouth of Nanliujiang river, and Aegiceras corniculatum was the most common affected tree species. Area of mangroves seriously affected by D. trifoliata was 95.62 hm2, accounting for 61.88％of total distribution area. From 2012 to 2021, annual average expansion rate of D. trifoliata showed trend of decrease, and annual average collapse rate had no obvious pattern of change.
万方数据
维普
