广东德庆县位于广东西部,是一个八山、一水、一田的山区县。全县有林面积221万亩,其中马尾松林达160万亩,是我省松脂生产和水土保持的重点县,又是马尾松毛虫的常灾区。由于纯松林多、疏林多,地被物少,不少林地寸草不生,水土流失十分严重,林区气候干燥,是肇庆地区七个县中年降水量最少的县,因此为松毛虫的大发生提 Deqing County, Guangdong Province is located in western Guangdong, is a mountainous area, a water, a field of mountain counties. The county has a forest area of ​​221 mu, of which 160 mu of Pinus massoniana forests, is the province’s Songhua production and water and soil conservation key county, but also the massacre of Masson pine caterpillar. Due to the abundance of pure pine forests, more sparse forests and less land cover, many forests are not covered with grass and soil erosion is very serious. The dry climate in the forest area is the county with the fewest precipitation in seven counties in Zhaoqing, mention