不同季节平茬对云南松苗木萌蘖能力的影响

Effects of Stumping in Different Seasons on Germination Ability of Pinus yunnanensis

以1年生云南松苗木为材料,采用随机区组设计,对春季、夏季、秋季平茬后云南松苗木的萌蘖增长数量、萌蘖累计数量、萌条长度进行测定与分析,筛选出能提高云南松苗木萌蘖能力合理的平茬季节,并探讨云南松苗木萌蘖能力对平茬季节的响应规律。结果表明:在不同季节平茬后,云南松苗木的萌蘖增长数量随着苗木生长时间的推移呈现先增长后下降的趋势;不同平茬季节萌蘖累计量差异显著,春季平茬显著高于夏季平茬且显著低于秋季平茬,平茬后第90天春季、夏季和秋季的萌蘖累计数量分别为11.6、11.4、13.6条;不同萌条长度等级的比率有差异性变化,从萌条等级比率来看,不同季节萌条长度差异显著,春季平茬萌条长度显著高于夏季平茬和秋季平茬。因此,云南松萌蘖能力对不同季节平茬的响应是不同的,春季对云南松进行平茬可以促进萌蘖的出生以及萌条的生长,同时提高萌条质量,可以获得较为优质的萌条。

The net number of sprout,cumulative number of sprout,and length of sprouts of Pinus yunnanensis seedlings were measured and analyzed in spring,summer,and autumn after stumping using annual P.yunnanensis seedlings as materials in a randomized group design.The effects of different stumping seasons on the growth of P.yunnanensis seedlings were used to screen out the reasonable stumping seasons that could improve the sprouting ability of P.yunnanensis seedlings and to explore the response pattern of sprouting ability of P.yunnanensis seedlings to the stumping seasons.The findings indicated that the net number of sprout in P.yunnanensis seedlings showed a trend of increasing and then decreasing with the growth time of the seedlings after stumping in different seasons.The cumulative number of sprout were different significantly among different stumping seasons,with stumping in the spring was significantly higher than stumping in the summer.Stumping in the spring and summer were significantly lower than stumping in the autumn.The cumulative number of sprout at 90 d after stumping was 11.6,11.4 and 13.6.The ratio of different sprout length grades had different changes.From the point of view of the sprout grade ratio,the length of sprouts differed significantly among seasons,with stumping in the spring was significantly higher than stumping in the summer and autumn.Based on the above results,the sprouting ability of P.yunnanensis had different responses to the stumping seasons.The stumping of P.yunnanensis in spring can promote the birth of sprout and the growth of sprout,and at the same time improve the quality of sprout.