干旱区生态环境知识资源中心(Arid): 毛乌素沙地4种沙生植物种子萌发及出苗对沙埋及单次供水的响应

Arid

	毛乌素沙地4种沙生植物种子萌发及出苗对沙埋及单次供水的响应
其他题名	Effects of one-time water supply and sand burial on seed germination and seedling emergence of four populary psammophyte in Mu Us sandy land
	郑明清 1; 郑元润 1; 姜联合 2
ISSN	1000-0933
出版年	2006
卷号	26 期号:8 页码:2474-2484
中文摘要	飞播固沙作为一项快速而有效的现代化治沙措施，已成为毛乌素沙地植被恢复与重建的重要手段。但此项技术仍存在一些问题，如飞播后成苗率较低等。以毛乌素沙地优势植物柠条(Caragana korshinskii)、羊柴(Hedysarum laeve)、油蒿(Artemisia ordosica ) 与籽蒿(Artemisia sphaerocephala)为研究对象，人工控制7个沙埋深度和9个水分梯度，研究4种植物种子萌发和幼苗出土对沙埋和单次供水的响应，阐明多大的单次降雨才能保证种子萌发与幼苗出土及出土幼苗的维持时间。结果表明，对于柠条和羊柴质量相对较大的种子而言，种子主要在供水量10～20mm，埋藏深度为0.5～2cm的条件下出苗，但在埋藏深度为5cm时这两个物种仍有少量种子能够出苗；而对于油蒿和籽蒿质量相对较小的种子而言，种子主要在供水量10～20mm，埋藏深度为0.5cm时出苗，当埋藏深度为1.5cm和2cm时不能顺利出苗。沙埋深度0.5cm条件下，4个物种具有最高的出苗率和出苗速率。在试验期内(30d)，柠条、羊柴和油蒿出土幼苗分别在单次供水量为5、7.5mm和7.5mm时全部死亡，在单次供水量高于15mm时4个种的出土幼苗死亡率大多低于50%，且随供水量的增加出土幼苗死亡率降低。结合毛乌素沙地降雨特点与本次实验结果，0.5cm的沙埋及7.5mm以上的单次降雨是上述4种植物自然条件下出苗较好的重要条件。
英文摘要	The Ordos Plateau is one of the major areas of desertification in Northern China. Aerial seeding has long been regarded as a successful and quick measure for vegetation rehabilitation in deserts and sand lands, but seedling emergence is low for four of the dominant psammophyte species inhabiting in Mu Us sandy land including Caragana korshinskii, Hedysarum laeve, Artemisia ordosica and Artemisia sphaerocephala. Experiments were conducted under controlled conditions to study the effects of one-time water supply and sowing depth on seed germination and seedling emergence of these four species, in order to understand how much one-time precipitation can ensure seed germination, seedling emergence, and the survival of emerged seedling until next rainfall. For each species, a set of experiments were conducted under the combination of one of seven depths of sand burial (0, 0.5, 1, 1.5, 2, 3, 5 cm) and an one-time continual water supply regime (2.5, 5, 7.5, 10, 15, 20, 30, 40 mm and 2.5 mm/3d). Our results show that: (1) for two species (Caragana korshinskii and Hedysarum laeve), a relative large number of seeds emerged mostly at 0.52 cm sowing depth and under 1020 mm one-time water supply regime, and a few seeds also emerged at 5 cm sowing depth; (2) for another two species (Artemisia ordosica and Artemisia sphaerocephala), seeds emerged well only at 0.5 cm sowing depth and under 1020 mm one-time water supply regime, however, Artemisia ordosica and Artemisia sphaerocephala can not emerge at 1.5 and 2 cm burial depth, respectively. In general, a 0.5 cm sowing depth resulted in the highest seedling emergence and emergence rate. It was also found that after 30 days, all the emerged seedlings of Caragana korshinskii, Hedysarum laeve and Artemisia ordosica died under 5, 7.5 and 7.5 mm one-time water supply regime respectively, and the seedlings mortality of all four species was under 50% in most treatments when one-time water supply regime is higher than 10 mm. As water supply was increased, the mortality of emerged seedlings of these four species was decreased accordingly. Based on our experiment results and precipitation characteristics of the Mu Us sandy land, 0.5 cm sowing depth and one-time water supply regime of more than 7.5 mm are the important conditions for seedling emergence and survival in field for all 4 species.
中文关键词	毛乌素沙地 ; 飞播 ; 荒漠化 ; 沙埋 ; 单次供水 ; 种子萌发 ; 幼苗出土 ; 植被恢复
英文关键词	Mu Us sandy land aerial seedling desertification sowing depth one-time water supply regime seed germination seedling emergence
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:2442615
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/2XILL650/220041
作者单位	1.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; 2.中国科学院植物研究所, 北京 100093, 中国
推荐引用方式 GB/T 7714	郑明清,郑元润,姜联合. 毛乌素沙地4种沙生植物种子萌发及出苗对沙埋及单次供水的响应[J]. 中国科学院植物研究所,2006,26(8):2474-2484.
APA	郑明清,郑元润,&姜联合.(2006).毛乌素沙地4种沙生植物种子萌发及出苗对沙埋及单次供水的响应.,26(8),2474-2484.
MLA	郑明清,et al."毛乌素沙地4种沙生植物种子萌发及出苗对沙埋及单次供水的响应".26.8(2006):2474-2484.