腾格里沙漠南缘3种一年生植物出苗率对沙埋和GA_3的响应

Response of Germination Rate of Three Annual Plant Species to Sand Burial Depths and GA_3 in Southern Marginal Zone of the Tengger Desert

以腾格里沙漠南缘3种一年生植物沙米((Agriophyllum squarrosum)、碟果虫实(Corispermum patelliforme)和五星蒿(Echinopsilon divaricatum)为材料,对种子进行1g/L赤霉素(GA3)处理和不进行GA3处理的沙埋对比实验,探索其在种子进行GA3处理前后出苗率随沙埋深度的变化规律。结果表明:①无论种子进行GA3处理与否,3种一年生植物种子的出苗率都随着沙埋深度的增加呈现下降趋势。②种子不进行GA3处理,3种一年生植物最佳沙埋深度是0.5cm;种子进行GA3处理,最佳沙埋深度依次是0.5～1cm,0.5～2cm和0.5～3cm。③种子GA3处理后,3种一年生植物的出苗率变化受植物种类和沙埋深度影响;沙米出苗率最大的深度为0.5cm,增加量3.2%;碟果虫实为0.5cm,增加量18.4%;五星蒿为2cm,增加量为27.4%。④种子GA3处理后,3种一年生植物出苗率的沙埋深度分别是沙米0.5～1cm,碟果虫实0.5～5cm和五星蒿0.5～5cm。

A sand-burying comparison experiment was carried out to investigate the germination rate of 3 annual plant species under different sand burial depths after the seeds were treated with 1.0 g/L GA3 and water before sowing.The results are as follows：（1） Germination rate of the 3 desert annual plant species was decreased with the increase of sand burial depth whether the seeds were treated with 1.0 g/L GA3 or water;（2） The optimal sand burial depth of the 3 annual plant species was 0.5 cm after the seeds were treated with distilled water,and their optimal sand burial depths varied in ranges of 0.5-1.0 cm,0.5-2.0 cm and 0.5-3.0 cm respectively after the seeds were treated with GA3;（3） After the seeds were treated with GA3,the germination rate of the 3 annual plant species was different and related to sand burial depth.The optimal sand burial depths for increasing the germination rate of Agriophyllum squarrosum,Corispermum patelliforme and Echinopilon divaricatum were 0.5 cm,0.5 cm and 2.0 cm,and their germination rates were increased by 3.2%,18.4% and 27.4%,respectively;（4） After the seeds were treated with GA3,the sand burial depths for increasing the germination rate of these 3 annual plant species varied in ranges of 0.5-1.0 cm,0.5-5.0 cm and 0.5-5.0 cm respectively.