沙松纸浆用材不同种源苗期生长模型的建立与拟合

通过对10个种源沙松(Abies holophylla)苗期高生长量的连续观测,并用Logistic方程对其生长动态过程进行拟合,获得苗高物候期与生长特征参数。结果表明:10个种源的沙松苗高生长节律基本一致,但各种源的速生期起止时间和持续时间存在差异,其中不同种源间线性生长始期最多相差5 d,线性生长末期最多相差7 d,线性生长期持续时间最多相差9 d。线性生长量占总生长量的55%以上,该时期为幼苗生长的关键期,应在线性生长期内做好除草、施肥、病虫害防治等管理工作,促进苗期苗高的生长。

Establishment and Fitting of Seedling Growth Models of Different Provenances for Pulpwood of Pinus elliottii

Through continuous observation of seedling height growth of 10 provenances of Abies holophylla,and using Logistic equation to fit its growth dynamic process,the seedling height phenology period and growth characteristic parameters were obtained.Result shows that the height growth rhythm of the ten provenances of Abies holophylla seedlings is basically the same.However,there are differences in the start and end time and duration of the fast-growing period of various sources.Among them,the difference between different species in the linear growth period is at most five days,the linear growth period is at most seven days,and the linear growth period is at most nine days.Linear growth accounts for more than 55%of the total growth.This period is the critical period for seedling growth.Weeding,fertilization,pest control and other management work should be done during the linear growth period to promote the growth of seedling height.