一年生云南松苗木优良性状评价效果的时间效应

Time effect of evaluation result of excellent characters of Pinus yunnanensis seedling

以生长周期为1a的云南松实生苗定株苗高、地径动态生长量数据为基础,在不同时间对两个性状进行优良程度评价,以7个基本指标和1个综合指标判断不同时间优良性状评价的效果,并总结评价效果在时间序列上的变化规律,分析两个性状在生长过程中的最佳评价时间点。结果表明：（1）在不同时间对苗高和地径的优良程度进行评价,判断其效果的7个基本指标皆有一定程度的变化规律。（2）构建综合指标可以直观体现评价效果随时间的变化趋势,据此趋势初步确定苗高最佳评价效果的时间范围在157～187d,地径最佳时间范围在235～265d。（3）通过与生长过程偶联分析发现：分别在t1、t0、t2三个生长特征点进行苗高、地径评价,其最终性状皆因评价时间不同而产生差异：H（t1）=8.821～9.024cm,H（t0）=9.987～10.193cm,H（t2）=10.435～10.476cm;D（t1）=5.122～5.225mm,D（t0）=5.187～5.280mm,D（t2）=5.590～5.842mm。（4）苗高、地径的最佳评价时间点皆在各自的生长后期,但两性状的生长特征点以及最佳评价时间点并不同步,苗高最佳评价的时间点在t2=150d后,而地径在t2=211d后。

Based on dynamic data of seedling height and basal diameters growth of one-year Pinus yunnanensis, the excellent degree of two characters at different time were evaluated, the evaluation effects of two characters by 7 basic indexes and 1 comprehensive index were judged, the variation of evaluation effects in the time series were summarized, and the optimal time points of evaluation of two characters in the growth process were analyzed. The results show that （1） The excellent degree of seedling height and basal diameters at different time were evaluated, all the variations of 7 basic indexes that were used to evaluated the excellent degree showed certain orderliness. （2） The comprehensive constructed index could directly embody the changing trend of evaluation effects with time series. Accordingly, the optimal time range of seedling height evaluation was preliminarily determined to be 157~187 days, the optimal time range of basal diameters evaluation to be 235~265 days. （3） The evaluation effects coupled with the growth process, and it was found that under the conditions of evaluating seedling height and basal diameters at three time points, of the final excellent degrees of t 0 , t 1 , t 2, there were differences being as follows： H（t 1 ）=8.821~9.024 cm,H（t 0 ）=9.987~10.193 cm, H（t 2 ）=10.435~10.476 cm;D（t 1 ）=5.122~ 5.225 mm, D（t 0 ）=5.187~5.280 mm, D（t 2 ）=5.590~5.842 mm. （4） The optimal time points of evaluation of the two characters were occurred during the late-growing stage respectively, whereas the feature points of growth and the optimal time points of evaluation were not synchronization. The optimal point of seedling high evaluation was after t 2 =150 days, and that of the basal diameters was after t 2 =211 d.