干旱区生态环境知识资源中心(Arid): 不同因素对沙蓬种子萌发和出苗的影响

Arid

	不同因素对沙蓬种子萌发和出苗的影响
其他题名	Influences of Different Factors on the Germination and Seedling of Agriophyllum squarrosum
	唐卫东; 魏林源; 马全林; 张晓娟; 张德魁; 樊宝丽; 陈芳; 胡小柯
来源期刊	西北林学院学报
ISSN	1001-7461
出版年	2017
卷号	32 期号:3 页码:156-161
中文摘要	以流动沙丘先锋植物沙蓬(Agriophyllum squarrosum)为研究对象,通过不同温度、光照、干旱胁迫和沙埋对沙蓬种子萌发和出苗影响的控制试验,以探索沙蓬种子萌发对风沙环境的适应性。结果表明,1)沙蓬种子具有休眠现象,在自然条件下发芽率仅18.3%,有利于适应沙漠恶劣和多变的环境条件;2)沙蓬种子萌发属于厌光型,光抑制了干沙层表面的种子萌发,从而保护了土壤种子库;3)沙蓬种子萌发的最适温度为25℃。4)在干旱胁迫环境下沙蓬种子发芽率<2%,加入1 000mg·L~(-1)外源GA_3后,沙蓬种子在渗透势为-0.067 6MPa时发芽率高达81.13%,GA_3可以缓解干旱胁迫;5)1.5cm沙埋+2 000mg·L~(-1) GA_3处理沙蓬种子出苗率高达70%,过深或过浅均不利于沙蓬种子出苗。
英文摘要	Agriophyllum squarrosumis a pioneer plant species that grow in mobile sand dune.In order to understand the adaptability of the seed germination to the windy and sandy environment,a controllable experiment was carried out to examine the influences of the relative factors to seed germination and seedling sprouting,such as light,temperature,drought stress and sand burial depths.The results showed that 1) dormancy occurred in A.quarrosum seeds,the seed germination rate in natural conditions only reached 18.3%,which however,was conducive to the adapt to the harsh desert and varying environmental conditions. 2)The seed germination rate under dark condition was higher than that of light condition.Light inhibited the germination of the seeds that were in the dry and surface sand layer,which was favorable to the protection of the seed bank in the soil.3)The optimum temperature for seed germination was 25℃.4)Under the drought stress,the seed germination rate was below 2%.However,under osmotic potential of -0.067 6MPa,the seed germination rate increased to 81.13%by adding 1 000mg·L~(-1) exogenous GA_3. GA_3could alleviate drought stress for seed germination.5)Seedling emergence rate was as high as 70% under the sand burial depth of 1.5cm with GA_3concentration of 2 000mg·L~(-1).Higher or lower than 1.5 cm would not favorable to the emergence.
中文关键词	沙蓬 ; 干旱胁迫 ; 沙埋深度 ; 休眠 ; 适应对策
英文关键词	Agriophyllum squarrosum drought stress sand burial depth dormancy adaptation strategy
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:5995360
来源机构	甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236783
作者单位	甘肃省治沙研究所, 甘肃省荒漠化与风沙灾害防治重点实验室国家重点实验室培育基地, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	唐卫东,魏林源,马全林,等. 不同因素对沙蓬种子萌发和出苗的影响[J]. 甘肃省治沙研究所,2017,32(3):156-161.
APA	唐卫东.,魏林源.,马全林.,张晓娟.,张德魁.,...&胡小柯.(2017).不同因素对沙蓬种子萌发和出苗的影响.西北林学院学报,32(3),156-161.
MLA	唐卫东,et al."不同因素对沙蓬种子萌发和出苗的影响".西北林学院学报 32.3(2017):156-161.