LYU Chaoyan,ZHANG Ximing,GAO Zhixi,et al.Seedling Emergence and Growth Responses of Haloxylon ammodendron to Sand Burial Depth[J].Northern Horticulture,2016,40(03):55-60.[doi:10.11937/bfyy.201603016]
梭梭幼苗出土及生长对沙埋深度的响应
- Title:
- Seedling Emergence and Growth Responses of Haloxylon ammodendron to Sand Burial Depth
- Keywords:
- Haloxylon ammodendron; sand burial depth; seedling emergence rate; seedling growth; biomass allocation
- 文献标志码:
- A
- 摘要:
- 沙埋是沙地植物生长和分布的重要选择压力之一，也是影响植物种子萌发、幼苗出土和幼苗存活的关键因素。选择梭梭典型自然生境，模拟梭梭种子自然埋藏深度状况，研究了0、0.5、1.0、2.0、3.0 cm 5种沙埋深度对其出苗率及幼苗生长的影响。结果表明：梭梭种子出苗率随埋深增加呈先增加后减小趋势，沙埋深度为0 cm时出苗率为4.2%，沙埋深度为0.5、1.0、2.0 cm时，出苗率分别为31.9%、14.7%和0.9%，沙埋深度为3.0 cm时无出苗。出苗早期，幼苗死亡率均较高，达到平均80.7%；其后，死亡率下降，且2.0 cm埋深幼苗死亡率显著高于其它处理，直至幼苗全部死亡。埋深对幼苗生长动态的影响主要表现在幼苗生长早期，0.5 cm埋深幼苗的地上、地下部分生长以及根冠比均大于0 cm和1.0 cm埋深；随着时间的推移，差异逐渐减小。表明0.5 cm埋深是梭梭种子萌发和幼苗生长的最佳深度。综上，中度沙埋在一定程度上可以促进梭梭种子的萌发出土与幼苗的早期生长，而重度沙埋抑制幼苗的生长，甚至导致幼苗的死亡。
- Abstract:
- Sand burial was one of the main stress on growth and distribution of sandy plant，and it is also the main factor that affected seed germination，seedling survival and growth in sandy land.To investigate the effect of burial depth on the Haloxylon ammodendron seedling’s emergence and growth in its typical natural habitats，a simulated study was conducted with five sand burial depth (0，0.5，1.0，2.0，3.0 cm).The results showed that the seedling emergence rate increased first but decreased then with increasing burial depth，being 4.2%，31.9%,14.7%，0.9% and 0% when the burial depth were 0，0.5，1.0，2.0，3.0 cm.And during the early stage of seedling emergence the seedling mortality was high in each treatment with average 80.7%.After that it decreased and it was significantly higher in 2.0 cm than the other.Additionally，the seedling shoot and root growth and the root/shoot ratio in 0.5 cm were higher than 0 cm and 1.0 cm during the early stage of seedling emergence.And this difference became small with the time.It was suggested that the optimal sand burial depth of H.ammodendron for its seedling emergence and growth would be 0.5 cm.Totally，it could be concluded that moderate burial could promote the seed germination，seedling emergence and its growth of H.ammodendron, but intensive burial could restrain its grown，even lead the seedling to die.
相似文献/References:
[1]孟根小,崔旭盛,吴艳,等.白粉病对梭梭生长、叶绿素及碳水化合物的影响[J].北方园艺,2012,36(14):141.
MENG Gen-xiao,CUI Xu-sheng,WU Yan,et al.Effects of Leveillula saxaouli on Growth,Chlorophyll and Carbohydrate of the Haloxylon ammodendron[J].Northern Horticulture,2012,36(03):141.
[2]吕朝燕,张希明,吕薇,等.梭梭种子萌发对干旱和盐分胁迫的响应[J].北方园艺,2016,40(01):55.[doi:10.11937/bfyy.201601015]
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[4]王泽,谷海斌,梁燕,等.北疆荒漠不同种源梭梭种子特性与环境因子关系[J].北方园艺,2020,44(08):80.[doi:10.11937/bfyy.20192581]
WANG Ze,GU Haibin,LIANG Yan,et al.Relationship Characters of Haloxylon ammodendron Seeds With Environmental Factors From Different Provenances in Northern Xinjiang Deserts[J].Northern Horticulture,2020,44(03):80.[doi:10.11937/bfyy.20192581]
备注/Memo
第一作者简介：吕朝燕（1985-），男，重庆巴南人，博士，副教授，研究方向为植物资源利用及恢复生态学与种子生态学。E-mail：lvchaoyan1985@126.com.责任作者：张希明（1951-），男，江苏镇江人，研究员，研究方向为植物生理生态学与种群生态学。E-mail：zhxm@ms.xjb.ac.cn.基金项目：贵州省教育厅自然科学研究资助项目（黔教合KY字[2015]409号）；遵义师范学院博士基金资助项目（遵师BS[2014]17号）；国家自然科学基金资助项目（30870472）。