干旱区生态环境知识资源中心(Arid): 琵琶柴根系分叉数与连接长度权衡关系的坡向差异

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	琵琶柴根系分叉数与连接长度权衡关系的坡向差异
其他题名	Differences of trade-off relationship among root forks and link length in Reaumuria soongorica on slopes of different aspects
	郑慧玲; 赵成章; 段贝贝; 冯威; 徐婷; 韩玲
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2015
卷号	34 期号:10 页码:2727-2732
中文摘要	权衡关系是生活史对策理论的基础,根系分叉数和连接长度的权衡关系对理解植物在不同生境下的表型可塑性有重要意义。利用ArcGIS建立研究区域的数字高程模型(DEM),采用全根系挖掘法,研究了祁连山北坡荒漠草原不同坡向琵琶柴(Reaumuria soongorica)根系分叉数和连接长度间的关系。结果表明: 随着坡向由南坡转向西坡、东坡、北坡,草地群落密度、盖度、高度和土壤含水量呈逐渐增加的趋势,琵琶柴种群的高度、根冠比以及根系连接长度呈逐渐减小趋势,比根长和分叉数逐渐增加; 不同坡向琵琶柴根系分叉数和连接长度的相关性存在差异,在南坡和北坡琵琶柴根系分叉数和连接长度之间存在极显著的负相关关系(P<0.01),在东坡和西坡二者之间存在显著的负相关关系(P<0.05); 琵琶柴根系分配给根系分叉数和连接长度的资源间存在着此消彼长的权衡关系。不同坡向琵琶柴根系合理权衡连接长度和分叉数的资源配置模式,反映了异质生境中资源多重竞争下琵琶柴生物量分配机制和提高种群适应性的策略。
英文摘要	Trade-off is the basis of life history strategy theory. Elucidation of the trade-off between root forks and link length is important for understanding the phenotypic plasticity of plants under different habitat conditions. By using the ArcGIS-established regional digital elevation model(DEM), this paper studied the trade-off relationship between root forks and link length of Reaumuria soongorica at different slope aspects in a desert grassland on the northern slope of Qilian Mountains,Northwest China with the method of whole root system excavation. The results showed that the plant community density,cover,height and soil moisture content displayed a pattern of gradual increase,and the height,root-shoot ratio and root link length of R. soongorica displayed a pattern of gradual decrease,while the specific root length and root forks increased gradually with the slope aspect turned from south to west,east and north. The relationship between root forks and link length varied with the slope aspect: there was a highly significant negative correlation between the root forks and link length at north slope and south slope (P<0.01), whereas the correlation reached a significant level at the east slope and west slope (P<0.05). There was a trade-off in resource allocation between the root forks and link length. The resource allocation mode in roots by reasonable trade-off between root forks and link length with changes in slope aspect of habitat reflected the mechanism of biomass allocation and the adaptation strategy of R. soongorica populations under conditions of multiple competitions for resources in diverse habitats.
中文关键词	琵琶柴 ; 根系构型 ; 根系分叉数 ; 根系连接长度 ; 坡向
英文关键词	Reaumuria soongorica root architecture root forks root link length slope aspect
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:5540968
来源机构	西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233238
作者单位	西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	郑慧玲,赵成章,段贝贝,等. 琵琶柴根系分叉数与连接长度权衡关系的坡向差异[J]. 西北师范大学,2015,34(10):2727-2732.
APA	郑慧玲,赵成章,段贝贝,冯威,徐婷,&韩玲.(2015).琵琶柴根系分叉数与连接长度权衡关系的坡向差异.生态学杂志,34(10),2727-2732.
MLA	郑慧玲,et al."琵琶柴根系分叉数与连接长度权衡关系的坡向差异".生态学杂志 34.10(2015):2727-2732.