银钟花一年生实生苗生长规律观测分析

Observation and Analysis of the Growth Pattern of One-year-old Seedlings of Perkinsiodendron macgregorii

【目的】探究银钟花1年生播种苗的生长规律,为培育高质量的苗木提供依据。【方法】以银钟花1年生播种苗为研究对象,测定其种子粒重、净度,温水浸种,测定其场圃发芽率、苗木生长节律、生物量,用SPSS软件建立模拟方程。【结果】银钟花种子千粒重为216.7 g、净度99.59%,播种后第2年才发芽,具有深休眠性,场圃发芽率为31%,1年生幼苗生长过程中苗高和地径均呈“S”型生长,地上部分生物量:地下部分生物量=1:0.84,地上生物量相对较大,根系发达。用SPSS软件回归拟合,得出其苗高、地径与生长时间的曲线方程关系式,可以较好的模拟估算出银钟花实生苗在其生长周期内某一时间点的苗高和地径。【结论】根据银钟花一年生播种苗的实际观测值和生长动态模拟,银钟花1年生实生苗的生长期可划分为4个时期,银钟花生长过程中出现2次生长高峰,分别在6月中下旬和8月中下旬,因此在这两个关键时间段内,应加强水肥管理,满足苗木旺盛生长所需的营养条件,促进健壮生长。

【Objective】This study aimed to explore the growth patterns of one-year-old seedlings of Perkinsiodendron macgregorii to provide a basis for cultivating high-quality seedlings.【Method】The one-year-old Perkinsiodendron macgregorii seedlings was used as the research object,the seed weight and purity were measured,the seeds were soaked in warm water,and the germination rate,seedling growth rhythm and biomass were measured.The simulation equation was established with SPSS software.【Result】The thousand-seed weight of Perkinsiodendron macgregorii was was 216.7 g,the purity was 99.59%,The seeds germinated in the second year after sowing,exhibiting deep dormancy,and the germination rate in the nursery was 31%.During the growth of one-year-old seedlings,both seedling height and ground diameter showed an“S”-shaped growth pattern.The biomass ratio of above-ground to below-ground parts was 1:0.84,indicating a relatively large below-ground biomass and a developed root system.The curve equation of seedling height,ground diameter and growth time was obtained by regression fitting with SPSS software,which could simulate the seedling height and ground diameter of Perkinsiodendron macgregorii at a specific time point during its growth cycle.【Conclusion】Based on actual observations and growth dynamics simulations of one-year-old Perkinsiodendron macgregorii seedlings,the growth period of these seedlings can be divided into four stages.There were two growth peaks during the growth process,occurring in mid-to-late June and mid-tolate August,respectively.Therefore,during these two critical periods,water and fertilizer management should be strengthened to meet the nutritional requirements for vigorous seedling growth,promoting healthy and robust development.