云南松苗木高径生长与温度周期性变化的关系

 为了解云南松苗木的高、径生长与周期性温度变化的关系,对一年生云南松苗高、地径动态生长量和相应生长期的温度指标进行调查,通过回归关系求解和分段分析的方法,总结其生长与时间异质下温度条件的重要关系.结果表明:① 苗高、地径净生长量都与各温度指标呈现类似二次曲线的关系,适宜的温度条件促进高、径生长,偏离最适温度条件会一定程度抑制生长;② 苗高生长最快时的平均气温、≥10 ℃的积温、最低气温、最高气温最适值依次为23.05,237.94,18.35,26.07 ℃;地径最适值依次为16.59,641.24,10.42,21.92 ℃;③ 不同时间的温度条件影响苗木生长的方式不同.9月底以前对苗高的影响主要是极端高温的抑制作用,此后的抑制则由极端低温引起;11月中下旬之前对地径的抑制因子主要是极端高温,此后是极端低温;④ 客观存在的温度条件时间异质性导致促进苗高生长的温度比促进地径生长的温度提前1~2个月出现,因此苗木表现出苗高生长高峰在前、地径生长高峰在后的异速生长现象.

Correlation between the temperature variation and the growth in height and basal diameter of seedling Pinus Yunnanensis

In order to find out if the height/basal diameters dynamic growth of seedling Pinus Yunnanensis changes with the temperature in a certain period,a study was carried out in one-year old P.yunnanensis and the data was collected and analyzed.The relation was summarized by regression analysis and segmentation method.The results showed that:① The relationship between net growth and the indices of temperature accords with quadratic curves,temperature within a certain range facilitates the growth of height and diameter,while deviation from the optimum temperature inhibits the growth to some extent;② The optimum temperature,≥10 ℃ accumulated temperature,minimum temperature,maximum temperature for height growth are 23.05,237.94,18.35,26.07 ℃ respectively,and for diameter growth they are 16.59,641.24,10.42,21.92 ℃;③ Different temperature affects the seedling growth in different ways.The height growth is inhibited by the extreme heat before the end of September and the extreme low temperature after that.The basal diameter growth is inhibited by the extreme heat before mid-late November and the extreme low temperature after that;④ The optimum temperature for the height growth appears 1—2 months earlier than that of the diameter growth.Therefore,allometry is shown during the growth of the seedlings,as the peak for the diameter growth occurs after the peak for the height growth.