不同立地条件对红豆杉幼苗生长状况的影响效果研究

Study on the Effect of Different Site Conditions on the Growth of Taxus chinensis Seedlings

[目的]了解不同立地条件下红豆杉幼苗生长状况,探讨立地条件对生长发育的影响。[方法]选择2年生红豆杉幼苗作为试验材料,通过设计不同坡位、坡向以及坡度的样地,研究红豆杉幼苗在不同立地条件下的成活率、平均生长量以及光合特性,探索适宜红豆杉幼苗生长的环境特点。[结果]红豆杉幼苗被种植在中坡、下坡时,成活率、苗高年生长量、地径年生长量以及光合特性都明显优于上坡;阴坡、半阴坡相比于阳坡、半阳坡,更加适合红豆杉幼苗的生长;坡度过高或者过低都会对红豆杉幼苗生长状况产生消极影响,推荐将红豆杉幼苗种植在坡度25°~35°的区域。[结论]培育和种植红豆杉幼苗时,为了获得更高的成活率,可以结合当地实际情况,选择中坡、下坡(海拔1400~1500 m)、阴坡、半阴坡(北、东北坡向)、坡度中等的种植区域,遵循中低海拔、阴坡、坡度中等的原则进行红豆杉造林。

[Objective]To understand the growth status of Taxus chinensis seedlings under different site conditions,and to explore the effects of site conditions on growth and development habits of T.chinensis.[Method]Two-year-old T.chinensis seedlings were selected as experimental materials.By designing plots with different slope positions,slope directions and slopes,the survival rate,average growth and photosynthetic characteristics of T.chinensis seedlings under different site conditions were studied,and the environmental characteristics suitable for the growth of T.chinensis seedlings were explored.[Result]When T.chinensis seedlings were planted on the middle and lower slopes,the survival rate,annual growth of seedling height,annual growth of ground diameter and photosynthetic characteristics were significantly better than those on the upper slope.Compared with sunny slope and semi-sunny slope,shady slope and semi-shady slope are more suitable for the growth of T.chinensis seedlings.Too high or too low slope will have a negative impact on the growth of T.chinensis seedlings.It is recommended to plant T.chinensis seedlings in areas with slopes of 25°~35°.[Conclusion]When cultivating and planting T.chinensis seedlings,in order to obtain higher survival rate,combine with the local actual situation,the planting areas of middle slope downhill(altitude of 1400-1500 m),shady slope semi-shady slope(north and northeast slope direction)and medium slope were selected,and the afforestation of T.chinensis was carried out according to the principles of middle and low altitude,shady slope and medium slope.