杂交马褂木扦插苗在南宁的生长规律

Study on the growth law of Liriodendron hybrids cuttings during steckling stage in Nanning

研究杂交马褂木扦插苗在南宁的生长规律及其与温度、降雨量的关系。采用有序样本聚类法可将苗木苗期生长划分为生长初期、速生期和生长后期3个阶段。速生阶段苗木的高和地径生长量分别占全年总量的59.11%和83.10%,地径速生期的时间(143天)显著长于苗高速生期(50天),是苗高速生期时间的2.86倍。相关分析表明:在制约苗木生长的气象因子中,降雨量比气温更显著地影响苗木的生长。

The growth rhythm of Liriodendron hybrid cuttings in Nanning and its relationships with temperature and rainfall were studied. According to the sequential sample cluster analysis, the growth of the steckling could be divided into three stages： initial growth stage, fast growth stage and late growth stage. During the fast growth stage, the growth of steckling height and caliper accounted respectively for 59.11% and 83.10% of their annual growth. The time （143d） of fast growth stage in caliper was significantly longer than the time （50d） of fast growth stage in steckling height, the time of fast growth stage in caliper was 2.86 times of that in height. Correlation analysis showed that among the meteorological factors which restrained steckling growth, rainfall had more effect on steckling growth than temperature. Key words： Liriodendron hybrid; steckling height; caliper; growth rhythm