干旱区生态环境知识资源中心(Arid): 科尔沁沙地69种植物种子重量比较研究

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	科尔沁沙地69种植物种子重量比较研究
其他题名	A COMPARATIVE STUDY OF SEED WEIGHT OF 69 PLANT SPECIES IN HORQIN SANDYLAND, CHINA
	刘志民; 李荣平; 李雪华; 骆永明; 王红梅; 蒋德明; 南寅镐
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2004
卷号	28 期号:2 页码:225-230
中文摘要	研究了科尔沁沙地69种植物的繁殖体(30种为种子,39种为果实)重量.结果表明:1)传播体为果实的植物可分为4个组别(即果实单粒重＜0.1 mg、0.1～0.999 9 mg、1～9.999 9 mg、10～99.999 9 mg);黄蒿(Artemisia scoparia)果实(0.051 7mg)和小香蒲(Typha minima)果实(0.068 2 mg)最轻,苍耳(Xanthium sibiricum)单个果实(77.894 3mg)最重;2)传播体为种子的植物可分为3个组别(即种子单粒重0.1～0.999 9 mg、1～9.999 9 mg、10～99.999 9mg);马齿苋(Portulaca oleracea)种子(0.151 4 mg)最轻,苦参(Sophora flavescens)种子(46.781 6 mg)最重;3)黄蒿、马齿苋、轮叶沙参(Adenophoratetraphylla)、碱地肤(Kochia sieversiana)、狼尾花(Lysimachia barystachys)、灰绿藜(Chenopodim glaucum)、刺沙蓬(Solsola ruthenica)、菟丝子(Cuscuta chinensis)、大籽蒿(Artemisia sieversiana)、狗尾草(Setaria viridis)、野古草(Arundinella hirta)等植物所以广泛分布可能是因为它们繁殖体轻(＜1 mg)且具有持久土壤种子库;4)流沙上的先锋植物或沙生演替系列前期植物沙蓬(Agriphyll～squarrosum)、差巴嘎蒿(Artemisia halodendron)、乌丹蒿(Artemisia wudanica)、狗尾草、雾冰藜(Bassia dasyphylla)的繁殖体要么重量居中或偏大,要么有降低位移的其它机制.
英文摘要	Previous studies have shown that seed mass is related to dispersal distance, seed longevity, estab-lishment success and fecundity. Many ecologists have employed seed weight as a trait to classify plant function-al types; however, few studies of this kind have been conducted in China. Horqin Sandyland, located in the semiarid agropastoral zone of northern China, has undergone severe desertification during the past decades. Formation of active dunes, degradation of natural vegetation, and loss of biodiversity are die primary issues of environmental concern. At present, no comparative studies on the regenerative strategies of the constituent plant species have been conducted, and basic information necessary for vegetation restoration activities is lack-ing . We conducted a comparative study on the seed weight of 69 species in Horqin Sandyland to better under-stand regeneration strategies of diese species for purposes of improving vegetation management and restoration. Seeds were collected at the Wulanaodu region (119°39’ - 120°02’ E, 42°29’ - 43°06’ N, 480 m a. s. 1.) . The climate there is semiarid with a mean annual precipitation of ca. 340 mm and a mean annual tem-perature of 6.3 °C . At present, 90% of the total land has been desertified and 70% of the meadow has be-come saline and sodic. Psammophile-dominated vegetation is well developed. Plant diaspores are usually referred to as seeds, even though many of them are in fact fruits. We analyzed data on seeds and indehiscent, single-seeded fruit. The air-dried weight of 100 diaspores was measured for each plant. Most grasses caryopses were measured with the persistent lemmas and awns widi which they are normally dispersed. The achenes of Compositae were measured with pappus and seeds and those of Cynanchum sibiricum, Metaplexis japonica and Apocynum venetum were also measured with hairs. Fruits of Xanthium sibiricum, Lappula myosotis and Bassia dasyphylla were measured with thorn and hook. The results showed that species could be divided into four groups with regard to the weight of diaspores as fruits ( <0.1 mg, 0.1 - 0.999 9 mg, 1 - 9.999 9 mg, 10 - 99.999 9 mg). The fruits of Artemisia scoparia (0.051 7 mg) and Typha minima (0.068 2 mg) were the lightest, and diose of Xanthium sihirkum were the heaviest. Species could be divided into 3 groups with regard to the weight of diasporas: 0.1-0.999 9 mg; 1 -9.999 9 mg; and 10-99.999 9 mg. Seeds of Porlulaca oleracea (0.151 4 mg) were the lightest, while the seeds of Sophoraflavescens (46.781 6 mg) were the heaviest. Small seeds and a persistent soil seed bank might be responsible for the extensive distribution of such species as Artemisia scoparia, Porlulaca oleracea, Adenophora tetraphyila, Kochia sieversiana, Lysimachia barystachys, Cherwpodium glaucum, Salsola ruthenica, Cuscuta chinensk, Artemisia sieversiana , Setaria viridis , and Anmdinella hirta. The pioneering species that establish on sand dunes such as AgriphyUuni squarrosum, Artemisia halodendron , A. wudanica, Setaria viridis and Bassia dasyphyila had medium or high diaspore weight, or had mechanisms to protect dias-pores from being carried away by the wind.
中文关键词	种子重量 ; 生活型 ; 土壤种子库 ; 分布 ; 沙生植物 ; 比较植物生态学
英文关键词	Diaspore weight Soil seed bank Distribution Psammophytes Comparative plant ecology Grassland degradation
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:1587980
来源机构	中国科学院沈阳应用生态研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205655
作者单位	中国科学院沈阳应用生态研究所, 沈阳, 辽宁 110016, 中国
推荐引用方式 GB/T 7714	刘志民,李荣平,李雪华,等. 科尔沁沙地69种植物种子重量比较研究[J]. 中国科学院沈阳应用生态研究所,2004,28(2):225-230.
APA	刘志民.,李荣平.,李雪华.,骆永明.,王红梅.,...&南寅镐.(2004).科尔沁沙地69种植物种子重量比较研究.植物生态学报,28(2),225-230.
MLA	刘志民,et al."科尔沁沙地69种植物种子重量比较研究".植物生态学报 28.2(2004):225-230.