Time effect of evaluation result of excellent characters of Pinus yunnanensis seedling
Chen Shi · Zhongnan Linye Keji Daxue xuebao · 2012
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 t0,t1,t2,there were differences being as follows: H(t1)=8.821~9.024 cm,H(t0)=9.987~10.193 cm,H(t2)=10.435~10.476 cm;D(t1)=5.122~ 5.225 mm,D(t0)=5.187~5.280 mm,D(t2)=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 t2=150 days,and that of the basal diameters was after t2=211 d.