不同温度条件下土壤粘着剂对宽叶雀稗种子发芽与幼苗生长的影响

doi:10.11686/cyxb2017393

摘要/Abstract

摘要： 为探索水土流失区植被恢复中植物种子发芽和幼苗生长的适宜条件,选取我国南方水土保持良种宽叶雀稗种子为试验材料,以长汀水土流失区的表层土壤为种子发芽基质,添加4个土壤粘着剂PAM浓度梯度(0、0.5、1.0和2.0 g·L^-1),采用人工气候箱控制4个温度梯度(15、20、25和30 ℃)进行种子萌发试验,研究温度和土壤粘着剂对宽叶雀稗种子发芽及幼苗生长的影响。结果表明,15~30 ℃随着温度升高,宽叶雀稗种子发芽开始时间由第10天提前至第3天,结束时间由第26天提前至第9天,温度越高,种子开始发芽时间越早,发芽速率越快;20和25 ℃时,宽叶雀稗种子发芽率和发芽势较高,20~30 ℃种子发芽指数与活力指数、幼苗生长与生物量显著高于15 ℃处理。添加土壤粘着剂有利于延长宽叶雀稗种子发芽历程与生长期,提高种子发芽速率;中低浓度粘着剂(0.5、1.0 g·L^-1)可提高种子发芽率、发芽势、发芽指数与活力指数,高浓度粘着剂(2.0 g·L^-1)对种子发芽有抑制作用,但中高浓度粘着剂(1.0、2.0 g·L^-1)可促进苗高和根长生长,提高幼苗生物量与根冠比。研究结果为宽叶雀稗在水土流失区的植被恢复应用提供科学参考依据和技术指导。

关键词: 宽叶雀稗, 土壤粘着剂, 种子发芽, 生物量, 温度

Abstract: In order to explore the optimum conditions for seed germination and seedling growth beneficial to vegetation restoration in areas suffering from soil erosion, this study investigated the effects of temperature and soil adhesive on seed germination and seedling growth of Paspalum wettsteinii. An experiment was carried out using the topsoil from an eroding area in Changting County as substrate with 4 different temperatures (15, 20, 25 and 30 ℃) controlled by an artificial climate incubator and 4 different soil conditions created by different soil adhesive-PAM concentrations (0, 0.5, 1.0 and 2.0 g·L^-1) which were added to the soil. The results showed that the initial seed germination time of P. wettsteinii was advanced from the 10th day to the 3rd day and the terminal seed germination time was advanced from the 26th day to the 9th day after seeding as temperature increased from 15 to 30 ℃. The seed germination rate and germination energy of P. wettsteinii under 20 and 25 ℃ were higher than other temperatures. The germination index, vigor index, seedling growth, and biomass at 20, 25, 30 ℃ were significantly higher than that at 15 ℃. The addition of soil adhesive increased the seed germination and prolonged germination and growth of P. wettsteinii. The seed germination rate, germination energy, germination index and vigor index were increased by adding low concentrations of adhesive (0.5 or 1.0 g·L^-1) to soil, seed germination was restrained by high soil adhesive concentration (2.0 g·L^-1). The results of this research provide a useful scientific reference and technical insight for vegetation restoration using P. wettsteinii.

Key words: Paspalum wettsteinii, soil adhesive, seed germination, biomass, temperature

王玉珍,黄晓,蔡丽平,郑惠欣,侯晓龙,周垂帆,邹显花. 不同温度条件下土壤粘着剂对宽叶雀稗种子发芽与幼苗生长的影响[J]. 草业学报, 2018, 27(4): 139-149.

WANG Yu-zhen, HUANG Xiao, CAI Li-ping, ZHENG Hui-xin, HOU Xiao-long, ZHOU Chui-fan, ZOU Xian-hua. Effects of soil adhesive on seed germination and seedling growth of Paspalum wettsteinii under different temperatures[J]. Acta Prataculturae Sinica, 2018, 27(4): 139-149.

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