| 固沙樟子松种子萌发与幼苗生长对干旱胁迫的响应及抗旱性评价 |
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| 引用本文： | 王东丽,张日升,方祥,王凯,吴叶礼,秦崧悦,龙丹丹,沈海鸥.固沙樟子松种子萌发与幼苗生长对干旱胁迫的响应及抗旱性评价[J].浙江农林大学学报,2020,37(1):60-68. |
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| 作者姓名： | 王东丽 张日升 方祥 王凯 吴叶礼 秦崧悦 龙丹丹 沈海鸥 |
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| 作者单位： | 1.辽宁工程技术大学 环境科学与工程学院, 辽宁 阜新 1230002.辽宁省沙地治理与利用研究所 章古台科尔沁沙地生态系统国家定位观测研究站, 辽宁 阜新 1230003.吉林农业大学 资源与环境学院, 吉林 长春 130021 |
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| 基金项目： | 国家自然科学基金资助项目41701325国家自然科学基金资助项目41601281“十三五”国家重点研发计划项目2016YFC0500803“十三五”国家重点研发计划项目2016YFE0202900辽宁省博士启动基金资助项目201601368内蒙古自治区科技计划项目201701024 |
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| 摘 要： | 目的 明确引种区不同生命周期阶段樟子松Pinus sylvestris var. mongolica固沙林在种子萌发期的天然更新优势。 方法 以科尔沁沙地南缘不同林龄樟子松固沙林种子为材料，采用聚乙二醇（PEG 6000）溶液（0、-0.054、-0.177、-0.393和-0.735 MPa）模拟不同干旱胁迫处理（ck、T1、T2、T3和T4）的方法，研究了其种子萌发与幼苗生长对干旱胁迫的响应特征及抗旱性。 结果 在干旱胁迫下，樟子松种子总体表现为萌发率下降，种子萌发时滞增加，萌发速率下降，萌发历时T4处理下显著缩短（P < 0.05）；樟子松种子萌发对干旱胁迫的响应还存在林龄间差异，28年生樟子松种子萌发率响应干旱胁迫的阈值最大，林龄小的种子萌发历时延长。在干旱胁迫下，幼苗生长相对值均有所下降，且总体随着干旱胁迫的加强先增大后减小，胚根长则有所增大，胚芽长和胚轴直径随着干旱胁迫的加强呈减小的趋势；林龄小的幼苗生长对干旱胁迫的响应更敏感。采用隶属函数法综合分析，不同林龄樟子松在种子萌发期抗旱性由强到弱依次为16、28、35、54年生。 结论 樟子松种子通过降低萌发率、推迟萌发、延长萌发持续时间、减缓萌发速率、增加胚根生长适应干旱胁迫，种子萌发期的抗旱性随林龄的增加而降低，宜选用青壮年樟子松种子，结合立地条件进行人工促进樟子松固沙林的天然更新。
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| 关 键 词： | 植物学 樟子松 天然更新 种子萌发 幼苗生长 抗旱性 |
| 收稿时间： | 2019-02-21 |
Seed germination and seedling growth response to drought stress and resistance evaluation for introduced Pinus sylvestris var. mongolica sandy-fixation plantation |
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| WANG Dongli,ZHANG Risheng,FANG Xiang,WANG Kai,WU Yeli,QIN Songyue,LONG Dandan,SHEN Haiou.Seed germination and seedling growth response to drought stress and resistance evaluation for introduced Pinus sylvestris var. mongolica sandy-fixation plantation[J].Journal of Zhejiang A&F University,2020,37(1):60-68. |
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| Authors: | WANG Dongli ZHANG Risheng FANG Xiang WANG Kai WU Yeli QIN Songyue LONG Dandan SHEN Haiou |
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| Affiliation: | 1.College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China2.National Positioning Observation and Research Station for Horqin Sandy Land Ecosystem of Zhanggutai, Liaoning Research Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China3.College of Resources and Environment, Jilin Agricultural University, Changchun 130021, Jilin, China |
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| Abstract: | Objective The aim is to understand the difficulty of seedling breeding and to solve the natrual regeneration problem in declined stands of Pinus sylvestris var. mongolica sandy-fixation plantation, response characteristics of the seed germination and seedling growth as well as resistance to drought stress were mined. Method An indoor control method was used for drought stress, with PEG 6000 (polyethylene glycol) solution concentrations (in MPa) and treatments being 0 (ck), -0.054 (T1), -0.177 (T2), -0.393 (T3), and -0.735 (T4). Seeds of P. sylvestris var. mongolica for different stand ages from the south margin of Horqin Sandy Land were selected as study materials, with characteristics of seed germination and seedling growth were measured. Drought resistance of P. sylvestris var. mongolica were analyzed by using principal component analysis and membership function method. Result Seed germination percentages and seed germination rates declined with an increase in time before germination in drought stress. Seed germination duration shortened significantly for T4 (P < 0.05). Differences existed between stand ages and responses of seed germination characteristics to drought stress. With strong drought stress, seed duration was extended for younger forests, but seeds of older forests finished germination rapidly. The threshold value of response to drought stress for seed germination percentage of 28 year-old P. sylvestris var. mongolica was maximal. Seedling growth relative value declined with drought stress and increased firstly then decreased as drought stress increased. Embryo length and hypocotyl diameter decreased overall as drought stress increased, and radicle length increased with drought stress. The membership function method showed that drought tolerance for different forest ages for P. sylvestris var. mongolica was in the order of 16 a > 28 a > 35 a > 54 a. Responses to drought stress during the germination stage included reduction in germination percentage, delayed germination, extended duration of germination time, slowed seed germination rate and increased radicle growth. Conclusion Drought tolerance of P. sylvestris var. mongolica during seed germination stage decreased as stand age increased, making it suitable to select seeds during the early production stage to promote natural regeneration of P. sylvestris var. mongolica sandy-fixation plantation. |
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