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保水剂对4种典型荒漠植物种子萌发的影响
马静, 单立山, 王洋, 李星辰, 李毅
甘肃农业大学 林学院, 甘肃 兰州 730070
摘要:
[目的]研究不同保水剂用量对4种典型荒漠植物种子萌发的影响,筛选种子包衣保水剂的适宜用量,为荒漠区植被恢复和荒漠化防治提供科学依据。[方法]以红砂(Reaumuria soongarica)、柠条(Caragana korshinskii)、泡果白刺(Nitraria sphaerocarpa)、花棒(Hedysarum scoparium)4种典型荒漠植物为研究对象,采用1%,4%,7%,10%,13%的保水剂对4种种子进行处理,测定4种种子的发芽率、发芽势、发芽指数。[结果]随保水剂用量的增加柠条种子发芽率呈现下降趋势,花棒、泡果白刺和红砂呈现先增加后降低的趋势,当保水剂用量为4%时发芽率最高;不同量保水剂处理对柠条和红砂种子发芽势影响显著(p<0.05)。随着保水剂用量的增加发芽势均呈现先增加后减小趋势,当保水剂用量为1%时柠条种子发芽势最高,4%时花棒、泡果白刺和红砂种子的发芽势最高;不同量保水剂处理对柠条、泡果白刺和红砂种子平均发芽速率和发芽指数影响显著(p<0.05),泡果白刺和红砂种子随着保水剂用量的增加呈现先增加后降低的趋势,当保水剂用量为4%时平均发芽速率和发芽指数最高,当保水剂用量为1%时,柠条种子发芽指数最大。[结论]保水剂用量对种子萌发的影响因物种而各异,适量的保水剂对典型荒漠植物种子的萌发具有促进作用。
关键词:  荒漠植物  种子包衣  保水剂  种子萌发  幼苗
DOI:10.13961/j.cnki.stbctb.2019.02.006
分类号:S728.4
基金项目:甘肃省科技支撑项目“河西走廊抗旱灌木种类筛选及造林关键技术研究与示范”(1604FKCA088);甘肃省重点研发计划项目(17YF1WA161);国家自然科学基金项目(31560135);甘肃农业大学学科建设专项基金(GAU-XKJS-2018-104);甘肃农业大学青年导师资助项目(GAU-QNDS-201605)
Effects of Water Retaining Agent on Seed Germination of Four Typical Desert Plants
Ma Jing, Shan Lishan, Wang Yang, Li Xingchen, Li Yi
College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070
Abstract:
[Objective] To study the effects of different dosages of water-retaining agents on seed germination of four typical desert plants, the suitable dosage of seed-coated water-retaining agents was screened to provide scientific basis for vegetation restoration and desertification control in desert areas.[Methods] Four typical desert plants, Reaumuria soongarica, Caragana korshinskii, Nitraria sphaerocarpa and Hedysarum scoparium, were studied. Their seeds were treated with 1%, 4%, 7%, 10%, and 13% water-retaining agents, and indices of germination rate, germination potential, average germination rate of these seeds were measured.[Results] With the increase of water-retaining agent dosage, the germination rate of Caragana korshinskii showed a downward trend. Hedysarum scoparium, Nitraria sphaerocarpa and Reaumuria soongarica showed a trend of increasing firstly and decreasing afterwards, and the highest germination rate showed when the amount of water retaining agent was 4%. The different amounts of water retaining agent had a significant effect(p < 0.05) on the seeds of germination potential. The germination potential increased first and then decreased with the increase of the amount of water-retaining agent. When the amount of water-retaining agent was 1%, Caragana korshinskii had the highest germination potential, and when it was 4%, Hedysarum scoparium, Nitraria sphaerocarpa and Reaumuria soongarica had the highest germination potential. Different amounts of water-retaining agent treat had significant effects on seed average germination rate and germination index(p < 0.05). The two indices of the seeds of Nitraria sphaerocarpa and Reaumuria soongarica increased first and then decreased with the increase of water-retaining agent dosage. The average germination rate and germination index were the highest at 4%. When the amount of water-retaining agent was 1%, Caragana korshinskii had the highest germination index.[Conclusion] The effect of water-retaining agent dosage on seed germination varied from species to species, and a suitable amount of water-retaining agent can promote the seed germination of typical desert plants.
Key words:  desert plant  seed coating  water retaining agent  seed germination  seedling