Abstract
The Yangtze River Basin is among the river basins with the strongest strategic support and developmental power in China. As an invasive species, the pinewood nematode (PWN) Bursaphelenchus xylophilus has introduced a serious obstacle to the high-quality development of the economic and ecological synchronization of the Yangtze River Basin. This study analyses the occurrence and spread of pine wilt disease (PWD) with the aim of effectively managing and controlling the spread of PWD in the Yangtze River Basin. In this study, statistical data of PWD-affected areas in the Yangtze River Basin are used to analyse the occurrence and spread of PWD in the study area using spatiotemporal visualization analysis and spatiotemporal scanning statistics technology. From 2000 to 2018, PWD in the study area showed an “increasing-decreasing-increasing” trend, and PWD increased explosively in 2018. The spatial spread of PWD showed a “jumping propagation-multi-point outbreak-point to surface spread” pattern, moving west along the river. Important clusters were concentrated in the Jiangsu-Zhejiang area from 2000 to 2015, forming a cluster including Jiangsu and Zhejiang. Then, from 2015–2018, important clusters were concentrated in Chongqing. According to the spatiotemporal scanning results, PWD showed high aggregation in the four regions of Zhejiang, Chongqing, Hubei, and Jiangxi from 2000 to 2018. In the future, management systems for the prevention and treatment of PWD, including ecological restoration programs, will require more attention.
Highlights
The Yangtze River Basin is among the river basins with the strongest strategic support and development power in China
River Basin showed an “increasing-decreasing-increasing” trend, and pine wilt disease (PWD) increased explosively in 2018. These disaster characteristics of PWD were reflected in the changes in the disaster area and the number of dead trees over the 19 studied years (Figure 1)
After 2000, the area affected by PWD in the Yangtze River Basin slowly decreased annually and dropped to the lowest value in 2013, with an average annual decrease of 2655 hectares
Summary
The Yangtze River Basin is among the river basins with the strongest strategic support and development power in China. It has played an irreplaceable role in the processes of. The. Yangtze River Basin consists of three national-level urban agglomerations River Delta, the Middle Reaches of the Yangtze River, and the Chengdu-Chongqing urban agglomeration). The Yangtze River Basin is among the regions with the strongest overall strengths and strategic positions in China [1]. Over the past 30 years, the population and economy in this region have rapidly grown at the cost of the local ecosystems, resulting in environmental degradation, and the degradation of the terrestrial ecosystem in the upper reaches of the Yangtze River and the aquatic ecosystems in the middle and lower reaches of the Yangtze
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