干旱区生态环境知识资源中心(Arid): 种子萌发和幼苗生长对沙丘环境的适应机制

Arid

	种子萌发和幼苗生长对沙丘环境的适应机制
其他题名	Adaptation strategies of seed germination and seedling growth to sand dune environment
	朱雅娟; 董鸣; 黄振英
ISSN	1001-9332
出版年	2006
卷号	17 期号:1 页码:137-142
中文摘要	综述了植物沙生适应机制的研究及其进展．一些植物的种子在刚成熟时具有休眠特性．种子需要适度沙埋促进萌发并实现幼苗定居，但过度沙埋则会抑制种予萌发和出苗．在沙层深处，没有萌发的种子会进入休眠状态，形成土壤种子库．幼苗通过增加节数和延长节间来适应沙埋．沙埋深度超过植物的忍耐限度会抑制幼苗生长，甚至导致幼苗死亡．沙生植物必须适应其他环境因子，如盐风与土壤盐分、昆虫采食、土壤养分亏缺等，才能在沙丘上成功生长．沙蚀可导致幼苗根系暴露并干燥脱水．一些沙漠植物的幼苗在萌发后可忍耐一段时期的干燥，水分条件得到满足之后，幼苗能够恢复生长．
英文摘要	Sand dune plants possess many adaptation strategies to withstand sand environment, e. g., some desert plant seeds are dormant when matured, which helps them to escape from unfeasible environment conditions and be preserved as seed bank. The seed germination and seedling establishment of psammophytes need moderate sand burial, while excessive burial will inhibit seed germination and seedling emergence. Seeds without germination in deeper sand are in enforced dormancy, and form soil seed bank. Sand dune plant seedlings could tolerant finite sand burial by increasing the number of nodes per culm and elongating internndes. When the seedlings are partially buried, they could survive through the maintenance of photosynthesis organism. Once sand burial exceed the threshold of the plant, seedlings growth will be restrained and the growth ability even permanently lost. Other factors such as salt spray, insect herbivory, and lack of soil nutrients also affect seed germination and seedling establishment. The precipitation in desert and sand land is unpredictable and irregular. Sand erosion leads roots be exposed to the air and dehydrated to die. However, seedlings of some desert plant have the ability to tolerate desiccation for a period of time after germination. Once there is rain, the seedlings will rivive.
中文关键词	沙丘 ; 沙埋 ; 沙蚀 ; 种子萌发 ; 种子休眠 ; 幼苗生长
英文关键词	Sand dune Sand accretion Sand erosion Seed germination Seed dormancy Seedling growth
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:2241490
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220336
作者单位	中国科学院植物研究所, 植被数量生态学重点实验室, 北京 100093, 中国
推荐引用方式 GB/T 7714	朱雅娟,董鸣,黄振英. 种子萌发和幼苗生长对沙丘环境的适应机制[J]. 中国科学院植物研究所,2006,17(1):137-142.
APA	朱雅娟,董鸣,&黄振英.(2006).种子萌发和幼苗生长对沙丘环境的适应机制.,17(1),137-142.
MLA	朱雅娟,et al."种子萌发和幼苗生长对沙丘环境的适应机制".17.1(2006):137-142.