基于 GIS的远安县松材线虫病入侵松林传播规律分析

Gis-based Analysis on the Transmission Law of Invasive pinewood Nematode in yuan’an county

摘要:

运用区域松材线虫入侵受害松林空间地理基础数据,基于 ARCGIS软件平台空间分析工具,对松材线虫病侵染源 数据库采用最近邻指数、标准差椭圆、核密度分析方法,定量和模拟地反映松材线虫病在空间的扩散情况,揭示松材线虫病 侵染源空间分布格局、空间传播模式、传播方向的时空转移及其分异规律、及其影响因素,有助于松材线虫病防控措施提供 科学依据o 结果表明:①研究区域松材线虫侵染源数量和程度分布有较明显差异,且散布分布,存在一定数量侵染源,具有 扩散的趋势o ②侵染源最近邻指数,受害松林空间分布格局为聚集分布,松材线虫病 自然传播下以侵染源点中心向周围呈 放射状蔓延o ③标准差椭圆定量分析表明该区侵染源传播方向为东南方向西北方向扩散,呈现面状扩散模式,较为分散区 域侵染源表现为受人为活动传播影响较大o ④侵染源核密度分析结果表明松林受害主要呈现点聚集分布,类似于热力点,具 有小班内部中心扩散和向外围小班扩散特征,放射状蔓延模式,与最近邻分析松材线虫病发生特征为集聚分布表现一致o 该 区域松材线虫病危害程度轻微,可防可控,可在空间格局上阻挡疫点,减少侵染源,并控制人为活动造成传播直至根除。

Abstract:

use area were worm intrusion suffer pine space geographic data, based on ArcGISsoftware platform for spa- tial analysis tools, Bursaphelenchus xylophius were reported in the source of infection database uSESthe nearest neighbor index, standard deviation ellipse, kernel density analysis method, quantitative and simulation of Bursaphelenchus xylophius were reported in reflect in the diffusion of space,pine wood nematode were reported in revealing the source of infection spread spatial distribution pattern, spatial pattern, the direction of propagation of transfer and its distribution rules of time and space, and its influencing factors, forest pest fields to provide a scientific basis for prevention and control measures . The results show that:①there were obvious differences in the distribution of the number and degree of infection sources of Bursaphelenchus xylophius in the towns and villages in the study area, and the distribution showed that there were a cer- tain number of infection sources with a tendency of diffusion . ②The nearest neighbor index R<1of the infection source showed that the spatial distribution pattern of the affected pine forest was clustered. under the natural transmission of Bursaphelenchus xylophius, the infection source point center radially spread to the surrounding area . ③the standard devia- tion ellipse quantitative analysis shows that the transmission direction of infection sources in this region is southeast and northwest, showing a planar diffusion pattern . ④the results of nuclear density analysis of infection sources showed that the victims of pine forest mainly showed the aggregation distribution of points, similar to thermal points, with the characteris- tics of central diffusion within a small group and diffusion to the periphery of a small group, and the pattern of radial spread was consistent with the aggregation distribution of the occurrence characteristics of disease in the analysis of the nearest neighbor . The damage of Bursaphelenchus xylophius in this region is slight, which can be controlled and prevented. In the spatial pattern, the epidemic point can be prevented, the infection source can be reduced, and the spread caused by human activities can be controlled until eradicated.