论文部分内容阅读
泡桐育苗虽然不是个新问题,但在河北却是一个新课题。泡桐分布于东经100—140°和北纬20—40°之间,气温24—28℃生长良好,38℃以上生长受阻,-20—-25℃不易越冬。气候条件是划定泡桐分布区域北界的重要因素之一。我国天然生长的泡桐分布在0℃的一月份等温线以南的地区。超过这个界限范围,雨量减少,气候干旱,生长期短和冬季低温,影响泡桐的自然分布。但通过人工栽培,可在一定条件下,使泡桐分布区北移。涿县近于泡桐分布北界边缘,有必要对培育高干壮苗技术和苗木生长规律进行研究,以期给河北泡桐育苗提供依据。
Paulownia nursery Although not a new issue, but in Hebei is a new topic. Paulownia distributed in the longitude 100-140 ° north latitude 20-40 ° between the temperature of 24-28 ℃ growth well above 38 ℃ growth retardation, -20--25 ℃ winter is not easy. Climatic conditions is to delineate the Paulownia area north of one of the important factors. Paulownia native growth in China distributed in January at 0 ℃ south of the isotherm region. Beyond this limit, rainfall, climate arid, short growing season and winter low temperature, affecting the natural distribution of Paulownia. But through artificial cultivation, under certain conditions, Paulownia distribution area northward. Juxian near Paulownia edge of the distribution of the northern boundary, it is necessary to cultivate high stem strong seedling technology and seedling growth rules to study to provide the basis for Paulownia seedlings in Hebei.