摘要
对野外自然生长的白榆天然更新状况进行调查分析,结果表明:白榆天然下种更新的分布特征是距离母树越远,更新植株分布越少,白榆天然下种更新的有效距离为60m。白榆天然下种更新幼树分枝数量、各级枝平均长度、各部分生物量也随地径的增大而增多。白榆适应性较强,在瘠薄环境下也能生长,光照不足或过于潮湿的环境不利于白榆的天然下种更新。
The natural regeneration of Ulmus pumila under natural condition was analyzed.The results were showed that the more distance the regeneration left from seed tree,the less plant regeneration distributed.The effective distance of natural regeneration was 60 meters.The numbers of young trees average length of different branches,numbers of root and biomass increased as the basal diameters increased.The Ulmus pumila had strong adaptive ability to the environment,which could grow well under the poor soil.However lack of sunshine and humid soil condition were unbenefit for the natural regeneration of Ulmus pumila.
出处
《现代农业科技》
2009年第22期192-194,共3页
Modern Agricultural Science and Technology
关键词
白榆
天然下种更新
特征
Ulmus pumila
natural seeding regeneration
characteristics
