摘要
在野生樱桃李天然分布区的4种生境内,通过对野生樱桃李根蘖萌苗及幼株的调查,探讨其无性繁殖特征及根蘖苗的更新规律。结果表明:在4个生境中,陡坡中根蘖萌苗的密度最大,其次为林下平地,缓坡中的最小,且均由5个龄级组成。4个生境中的根蘖率表现为:陡坡〉林下平地〉沟底〉缓坡,陡坡生境中的根蘖率远高于其他3个生境。樱桃李的根蘖率整体上随着母株基径增大,呈先缓慢增加后急剧下降的趋势,最大值出现在母株基径径级为Ⅵ(20.0-23.0 cm)处。不同生境中的根蘖萌芽点在各土层深度中的比率均表现为第1层(0-1 cm)的最大,且85%以上的根蘖萌芽点集中分布在第1层和2层中。随着龄级的增加,根蘖苗的茎干干枯死亡率均逐渐下降,且沟底中的根蘖苗的死亡率最高。
The characteristics of clonal propagation and the seedling regeneration from root suckers of wild Prunus divaricata in four habitats were studied in this research. The result indicated that the density of the younger sprouting seedlings of Prunus divaricata in gully habitat was the highest; the following were forest floor,steep slope and gentle slope,successively. There were five age classes of sprouting seedlings,the proportion of seedlings reduced with increase of age class in different habitats. And the proportion of sprouting in steep slope habitat was the highest,and others successively were in sequence of forest floor,gully and gentle slope. The sprouting rate firstly increased and then decreased rapidly when maternal diameter of wild Prunus divaricata increased,and it reached maximum when the maternal diameter class isⅥ( 20. 0-23. 0 cm). More than 85 percent of adventitious buds from root suckers mainly happened in the first and second soil layer in different habitat. There were significant difference in the distribution layer of root suckers regeneration,and the first soil layer( 0-1 cm) had the highest proportion in all the four habitats. Along with sprouting seedlings aging,the mortality decreased gradually in all the four habitats,and the seedlings in the bottom of gully had the highest mortality.
出处
《干旱区研究》
CSCD
北大核心
2015年第5期947-952,共6页
Arid Zone Research
基金
国家自然科学基金项目(41061009)