干旱区生态环境知识资源中心(Arid): 大赖草(Leymus racemosus)结实格局

Arid

	大赖草(Leymus racemosus)结实格局
其他题名	Fruit-Set Patterns of Leymus racemosus
	古丽娜儿·阿不来提; 周桂玲; 阿依吐尔汗·热依木
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2014
卷号	34 期号:4 页码:1037-1041
中文摘要	连续2年对新疆阿勒泰地区荒漠植物大赖草(Leymus racemosus)居群(公路附近沙丘平坦处,P1;农田周围沙丘平坦处,P2;周围积水沙丘中下部,P3;多个沙丘中间平坦处,P4;多个沙丘中间隆起处,P5)、小穗间和小穗内的结实格局进行了比较研究。结果表明:(1)2011年大赖草的穗长、穗宽、总花数、结实率和大种子比率都高于2012年,小种子数低于2012年;2年的结实率在5个居群间均表现为P2>P3>P1>P5>P4。(2)每花序内不同小穗的穗宽、总花数和结实率表现为中部>下部>上部。(3)每小穗均有3.70.56朵花、0.60.09粒种子,小穗基部的结实率较高。大赖草结实率在年际和不同环境下波动较大,水分和温度是影响其结实格局的主要因素;小穗间及小穗内的资源分配符合资源竞争假说。大赖草花多果少的结实格局是适应荒漠资源贫瘠、干旱少雨气候条件的一种生殖保障。
英文摘要	The fruit-set patterns of the different populations,different part of an ear and spikelets of desert plants Leymus racemosus was studied for two years.The results showed that:(1)the proportion of the panicle length,spike width,total flowers numbers,seed setting rate and large seeds of L.racemosus in all five populations in 2011 were higher than that in 2012;but the numbers of small seeds were higher in 2012 than in 2011;Seed setting rates in the 5 populations were P2>P3>P1>P5>P4.(2)The sequence of The panicle length,spike width,numbers of total flowers and seed setting rate of spikelets on different part of ear were showed middle part>lower part>upper part.(3)The flowers and seeds on per spikelet were 3.70.56 and 0.60.09,respectively.And the seed setting rate on the base part of spikelet reached the highest level.By combining 2 years observation of climatic factors and different populations’environmental conditions in the period of duration,and found that the seed setting rate of L.racemosus is very sensitive to the inter-annual and environmental changes.That moisture and temperature are the main factors that influence the fruit-set patterns of L.racemosus.The resources allocation in the different part of an ear and spikelets match with the resources competition hypothesis.The characters as more flowers and less fruit of L.racemosus is a kind of reproductive assurance that adapt to the arid and rainless,and leanness desert resources environment.
中文关键词	大赖草(Leymus racemosus) ; 结实格局 ; 资源限制 ; 资源分配
英文关键词	Leymus racemosus fruit-set patterns resource constraints resource allocation
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:5198572
来源机构	新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232200
作者单位	新疆农业大学草业与环境科学学院, 新疆草地资源与生态重点实验室, 乌鲁木齐, 新疆 830052, 中国
推荐引用方式 GB/T 7714	古丽娜儿·阿不来提,周桂玲,阿依吐尔汗·热依木. 大赖草(Leymus racemosus)结实格局[J]. 新疆农业大学,2014,34(4):1037-1041.
APA	古丽娜儿·阿不来提,周桂玲,&阿依吐尔汗·热依木.(2014).大赖草(Leymus racemosus)结实格局.中国沙漠,34(4),1037-1041.
MLA	古丽娜儿·阿不来提,et al."大赖草(Leymus racemosus)结实格局".中国沙漠 34.4(2014):1037-1041.