干旱区生态环境知识资源中心(Arid): 黄土高原多年生草本物种根部导水结构及空间分异特征

Arid

	黄土高原多年生草本物种根部导水结构及空间分异特征
其他题名	Spatial variability of hydraulic conductivity traits of perennial herbaceous species in the Loess Plateau of China
	张国帅; 买尔当·克依木; 焦磊; 高光耀; 李宗善; 王晓春
来源期刊	生态学报
ISSN	1000-0933
出版年	2020
卷号	40 期号:14 页码:4883-4893
中文摘要	植物茎干导水系统起着植株水分长距离输导功能,深入了解植物导水解剖结构和功能对于认识植物水分、养分输导和分配策略具有重要意义,然而相关研究还是主要集中在木本乔、灌木物种上,而对于多年生草本物种的相关研究还未引起人们的重视。以黄土高原多年生草本物种为研究对象,在黄土高原沿降雨梯度(250530mm)布设12个采样点,采集了30种多年生草本物种的主根解剖材料,并分析了该地区草本物种根部导管解剖结构及空间分异特征。研究结果表明1)多年生草本物种根部导管特征参量具有较大的变异性,在固定测量范围内导管数量、导管直径、导管分数、总水分传导效率的变化范围分别为25295个、24.4654.58mum、2.42%33.16%、0.03425.357kg m-1MPa-1s-1。2)多年生草本根部导管直径、导管分数和导水效率均沿降雨量的增加呈不断下降趋势,其中以导水效率下降趋势最为明显(R=-0.3-0.362,P<0.05),这表明水分条件是限制黄土高原草本物种根部导水特征空间变异的主要因素。3)多年生草本根部导管直径和导水效率以半荒漠分布为主的蒺藜科草本物种中数值最高,其次是人工种植为主的豆科草本物种,而以自然分布为主的菊科草本物种的导管参量数值最低,这表明黄土高原不同类群草本物种的导水特征和输水策略存在较大差异性。
英文摘要	Plant stem xylem system of woody species has an important role in long-distance water transport,and the scientific description of anatomical xylem structure and functions are essential for understanding the transportation mechanism and allocation strategies of water and nutrient of woody species.However,the related research on perennial herbaceous species has received scant attention.In this study,the main root samples of 30 perennial herbaceous along the precipitation gradient(from 250 mm to 530 mm)in the Loess Plateau were collected.We measured eight hydraulic conductivity traits and analyzed their spatial variability.The results indicated that 1)the value of xylem traits had comparatively large magnitude of variability.The number of vessel,vessel fraction,mean vessel diameter and total water transfer efficiency ranged from 25 to 295,24.46 mum to 54.58 mum,2.42% to 33.16%,and 0.034 kg m-1 MPa-1 s-1 to 25.357 kg m-1 MPa-1 s-1,respectively.2)The vessel diameter,vessel fraction and water transfer efficiency of xylem conduits roughly kept steady decreasing trend with the increasing precipitation.In particular,the negative relationship between water transfer efficiency and precipitation approached the significant levels(r=-0.3-0.362,P <0.05).This emphasized the fact that moisture availability exerted significant influence on spatial variability of hydraulic conduct traits of the perennial herbaceous species in the Loess Plateau.3)The value of vessel diameter and water transfer efficiency were the highest of the herbaceous species in the family of Zygophyllaceae that mainly distributed in sub-desert regions,followed by the herbaceous species(planted species)of Leguminosae family,and the lowest value were found in the herbaceous species(native species)of Compositae family,indicating the heterogeneous hydraulic traits and diverse water transfer strategies of different phyto-groups of perennial herbaceous species on the Loess Plateau.
中文关键词	多年生草本 ; 主根导管 ; 导水效率 ; 黄土高原
英文关键词	perennial herbaceous species hydraulic conductivity traits water transfer efficiency the Loess Plateau
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6777798
来源机构	陕西师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336759
作者单位	张国帅, 东北林业大学生态研究中心, 哈尔滨, 黑龙江 150040, 中国.; 王晓春, 东北林业大学生态研究中心, 哈尔滨, 黑龙江 150040, 中国.; 买尔当·克依木, 中国科学院生态环境研究中心, 城市与区域生态国家重点实验室, 北京 100085, 中国.; 高光耀, 中国科学院生态环境研究中心, 城市与区域生态国家重点实验室, 北京 100085, 中国.; 李宗善, 中国科学院生态环境研究中心, 城市与区域生态国家重点实验室, 北京 100085, 中国.; 焦磊, 陕西师范大学, 西安, 陕西 710119, 中国.
推荐引用方式 GB/T 7714	张国帅,买尔当·克依木,焦磊,等. 黄土高原多年生草本物种根部导水结构及空间分异特征[J]. 陕西师范大学,2020,40(14):4883-4893.
APA	张国帅,买尔当·克依木,焦磊,高光耀,李宗善,&王晓春.(2020).黄土高原多年生草本物种根部导水结构及空间分异特征.生态学报,40(14),4883-4893.
MLA	张国帅,et al."黄土高原多年生草本物种根部导水结构及空间分异特征".生态学报 40.14(2020):4883-4893.