论文部分内容阅读
兴隆县位于京津的东北部,是首都东北一道天然绿色屏障。几年来,杨树已成为首都周围绿化工程、退耕还林工程的首选树种。为加快杨树品种品系更新,优化品种结构,兴隆县自2000年起选择适合本县栽培的速生、抗风沙、耐贫瘠、抗病虫能力强的杨树优良品种,先后从外地引种十余个,从中筛选出综合性状表现良
Located in the northeast of Beijing-Tianjin, Xinglong County is a natural green barrier to the northeast of the capital. In recent years, poplar has become the greening project around the capital, the preferred tree species of the project of returning farmland to forest. In order to accelerate the popularization of varieties of poplar varieties and optimize the structure of breeds, Xinglong County, since 2000, has selected the poplar, poplar, sand-resistant, barren-resistant and pest-resistant poplar cultivars suitable for cultivation in this county. More than ten , From which the comprehensive traits of good performance