保水剂对白蜡树容器苗生长及生理特性的影响

Effect of super absorbent and fertilizer on growth and physiological characteristics of Fraxinus chinensis Roxb container seedlings

利用容器育苗成型技术研究了保水剂配施肥料对白蜡生长及生理特性的影响。结果表明:保水剂配施肥料可提高白蜡生长中后期叶片的光合速率和叶绿素含量,仅加入保水剂可提高白蜡的根系活力,但对光合速率和叶绿素含量影响不大。白蜡生长的动态积累规律符合Logistic生长回归模型,保水剂配施肥料可延长白蜡快速积累的总时间,提高苗高和地径积累的最大速率。没有肥料加入的情况下,保水剂对白蜡生长的特征值影响不大。草炭复合基质适宜白蜡树幼苗的成活及生长,不同处理白蜡树的成活率均为100%。保水剂配施肥料可使白蜡的苗高、地径、地上部和地下部干物质量分别增加15.92%、13.14%、6.16%和15.71%,仅加入保水剂可使白蜡根系干物质量增加10.29%,但对苗高、地径及地上部分干物质量影响不大。因此,保水剂可有效改善白蜡树容器苗的生理特征,促进其生长及干物质的积累。

The present study was conducted to quantify the suitability of super absorbent polymer as a growth enhancer in forest container seedlings.Effect of super absorbent polymer co-applied with or without fertilizer on the growth and physiological characteristics of Fraxinus chinensis Roxb was studied using cultivation shaping technique,under the equal moisture content.Results showed that super absorbent polymer co-applied with fertilizer increased photosynthetic rate and chlorophyll content to some extent.Super absorbent polymer applied alone had no influence on photosynthetic rate and chlorophyll content,but it was beneficial to improve the root activity.Seedling height and caliper accumulation of F.chinensis Roxb could be well described by Logistic equation with different feature in different treatments.Super absorbent polymer co-applied with fertilizer delayed the terminal time and extended the quick accumulation time.Additionally,the maximum daily accumulation of seedling height and caliper was increased to some extent.Without fertilizer,super absorbent polymer in cultivation shaping media had no significant influence on Logistic equation features.Peat compound media was suitable for the survival and growth of seedlings,and the survival rate of F.chinensis Roxb seedlings in container was 100 %.Besides,super absorbent polymer co-applied with fertilizer increased the seedling height,caliper,aerial part dry weight and root dry weight by 15.92 %,13.14 %,6.16 % and 15.71 %,respectively.However,without fertilizer,super absorbent polymer in cultivation shaping media had no effect on seedling height,caliper and shoot dry weight of F.chinensis Roxb,but root dry weigh was increased by 10.29 %.Hence,super absorbent polymer could improve the physiological characteristics,as well as the growth and dry matter accumulation of F.chinensis container seedlings.