恩施市松材线虫病扩散规律研究

Study on the Diffusion Law of Bursaphelenchus xylophilus in Enshi City

利用恩施市历年的松材线虫病除治资料,对该疫区松材线虫病的扩散趋势和发生规律进行了初步分析。结果表明:恩施市松材线虫病的发生范围随着时间的推进,发生地块逐年增多,发生程度逐年加重,发生范围逐年向外围推移。发生面积由最初的2.54 km2扩展到900.00 km2之多,疫木数量呈逐年上升趋势。由于受到山脊阻拦,南北方向的扩散速度与范围远大于东西方向。公路沿线、河流沿岸远重于地势较高的山脊等地。在该病害除治时采用皆伐的方式极易导致环境条件较差的森林群落生境片段化。该研究为恩施市松材线虫病的除治和抑制马尾松群落片段化提供了重要的理论依据。

According to the past years＇ control data of Bursaphelenchus xylophilus in Enshi City, preliminary analysis was carried out about its diffusion trend and occurrence rule in this area. This result showed that occurrence area of Bursaphelenchus xylophilus gradually increased over time, with a deeper degree and expanded range of occurrence. The disease occurrence area extended from 2.54 km^2 to 900. 00 km^2, the number of sick trees had increased year by year. The diffuse speed and range of North-south direction was much greater than that of East-west direction because of the holdback of mountains. The epidemic along road and rive line was much more serious than that of higher altitude region such as mountain ridge . The disafforestation in infected region with purpose of prevention and control could lead to forest community fragmentation. This study offered important theoretical basis for the control of community fragmentation of Pinus massoniana Lamb.