干旱区生态环境知识资源中心(Arid): 星毛委陵菜根系构型对草原退化的生态适应

Arid

	星毛委陵菜根系构型对草原退化的生态适应
其他题名	Ecological adaptation of root architecture to grassland degradation in Potentilla acaulis
	周艳松; 王立群
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2011
卷号	35 期号:5 页码:490-499
中文摘要	对轻度、中度、重度和极度退化的草原群落中星毛委陵菜(Potentilla acaulis)根系构型参数及相应的土壤水分、容重和硬度等指标进行了分析, 以研究星毛委陵菜根系构型对草原退化的生态适应性. 结果表明: 1)在以大针茅(Stipa grandis)为建群种的典型草原中, 随着退化程度的加剧, 星毛委陵菜在群落中的作用逐渐增强, 其根幅、根深、一级垂向根数、分蘖子株数和水平分蘖根长度显著增加; 2)根表面积、二级侧根长度、总根长和根分叉数4个根系构型参数是解释星毛委陵菜根系构型对草原退化生态适应的首选指标, 解释力依次减小, 累计贡献率为92.34%; 3)直径2 mm以下的根系对单株系星毛委陵菜的根表面积和总根长影响显著; 4)阔腰倒锥体三维根系构型是星毛委陵菜适应草原退化并使之成为建群种的优势构型
英文摘要	Aims Our objectives were to 1) examine the ecological adaptability of Potentilla acaulis to grassland degradation from the perspective of root architecture, 2) reveal why it can be a dominant species in extremely degraded grassland and 3) discuss its important roles in vegetation restoration or succession and preventing grassland from desertification. Methods We collected relatively complete P. acaulis roots by trenching. The numbers of first vertical roots, length of horizontal root tillering and number of plant tillers were recorded in the field. The root analysis system of WinRHIZO was used to determine total root length, root surface area, total root volume, root average diameter, number of furcations, average branching angle, number of root axes, length of root axes, number of root tips, number of first lateral roots, length of first lateral roots, number of secondary lateral roots, length of secondary lateral roots, root diameters along root length, root surface area and root volume. The data were analyzed by one-way ANOVA and principal component analysis. Important findings In degraded grassland typified by Stipa grandis, the function of P. acaulis became more important in the community and its root range, root depth, the number of first vertical roots, the number of plant tillers and the length of horizontal root tillering increased significantly. The parameters of root surface area, length of secondary lateral roots, total root length and the number of furcations explained the adaptability of P. acaulis to grassland degradation. Roots with a diameter <2 mm had a significant effect on root surface area and total root length of single plants of P. acaulis. The three-dimensional root architecture of a broad-waist-inverted centrum was an advantageous configuration for P. acaulis to adapt for grassland degradation and can explain P. acaulis as a constructive species in extremely degraded grassland
中文关键词	阔腰倒锥体 ; 生态适应 ; 草原退化 ; 星毛委陵菜 ; 根系构型 ; 根系构型参数
英文关键词	broad-waist-inverted centrum ecological adaptation grassland degradation Potentilla acaulis root architecture root architecture parameter
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:4180107
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227370
作者单位	内蒙古农业大学生态环境学院, 呼和浩特, 内蒙古 010018, 中国
推荐引用方式 GB/T 7714	周艳松,王立群. 星毛委陵菜根系构型对草原退化的生态适应[J]. 内蒙古农业大学,2011,35(5):490-499.
APA	周艳松,&王立群.(2011).星毛委陵菜根系构型对草原退化的生态适应.植物生态学报,35(5),490-499.
MLA	周艳松,et al."星毛委陵菜根系构型对草原退化的生态适应".植物生态学报 35.5(2011):490-499.