广东省新丰江水库周边地区2019年松材线虫病遥感监测分析

Remote Sensing Surveillance and Analysis of Pine Wood Nematode Disease in 2019Around the Xinfengjiang Reservoir in Guangdong Province

近30年以来,广东省林业有害生物不断入侵,尤其是松材线虫的入侵对林业发展造成严重影响。本研究以新丰江水库周边为研究对象,结合遥感解译和实地踏查的方法,对该地区2019年秋季的松材线虫病害进行了遥感监测。结果表明,2019年新丰江水库周边松材线虫病情较为严重,松树枯死数量较大。遥感监测结果准确率很高,通过人工GNSS定位核查死树62棵。其中正确提取61棵,错误1棵,解译准确率98.4%。调查遗漏23棵(大部分松树为往年枯死松树,颜色偏灰),遗漏比率27%。遗漏原因一方面是由于现地调查时间比实际影像数据采集时间晚了近一个月,在此期间有新发的死树;另一方面是一些中幼林木,遥感能力所限无法监测到。通过本研究可以为广东松材线虫的遥感监测提供技术支持。

Over the past 30 years,forestry pests in Guangdong Province have continuously invaded,especially the pine wood nematode invasion has caused serious impact on forestry development.This study took the surrounding area of Xinfengjiang Reservoir as the research object,combined with the methods of remote sensing interpretation and field survey,to remotely monitor the pine wood nematode disease in the region in autumn 2019.The results showed that the pine wood nematode disease around Xinfengjiang Reservoir was more serious in 2019,and the number of pine trees withered was larger.The accuracy of remote sensing monitoring results is very high,and 62 dead trees are checked by manual GNSS positioning.Among them,61 trees were correctly extracted and 1 was missed,and the interpretation accuracy rate was 98.4%.The survey missed 23 trees(most of the pine trees were dead pine trees in previous years,and the color was grayish),with a missing rate of 27%.The reason for the omission is that on the one hand,the on-site investigation time is nearly a month later than the actual image data collection time,and there are new dead trees during this period;on the other hand,some young forest trees,which cannot be monitored due to the remote sensing capabilities.This study can provide technical support for the remote sensing monitoring of pine wood nematodes in Guangdong.