干旱区生态环境知识资源中心(Arid): 三种锦鸡儿属植物水力结构特征及其干旱适应策略

Arid

	三种锦鸡儿属植物水力结构特征及其干旱适应策略
其他题名	Hydraulic architecture characteristics and drought adaption strategies for three Caragana genus species
	龚容; 徐霞; 田晓宇; 江红蕾; 李霞; 关梦茜
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:14 页码:4984-4993
中文摘要	水分胁迫是干旱半干旱区限制植物生长的主要因素。以干旱半干旱区的3种锦鸡儿属植物为研究对象,从生态适应策略角度来分析3种锦鸡儿植物产生生态分离的原因。对三种锦鸡儿属植物茎干叶片的显微结构、生理功能(导水率、光合速率以及水分利用效率)进行测定,并统计了3种锦鸡儿植株的形态特征,如一、二级枝的直径、长度、末端叶面积。结果表明:三种锦鸡儿属植物都能形成较小的导管直径来适应旱生环境,但是在导水结构上又表现出一定的差异性。中间锦鸡儿的导管直径最小,次脉密度和最大净光合速率最大;柠条锦鸡儿的导管直径、叶片厚度和比叶重(LMA)最大。小叶锦鸡儿在导水率下降50%时的水势(P_(50))最大,水分胁迫时极易发生栓塞,但正是由于导管的栓塞降低了水分运输效率,使其在旱生环境中能够通过减少水分的供应来降低水分的丧失,从而保证自身生长的水分需求;而中间锦鸡儿则主要通过减小导管直径来适应旱生环境;柠条锦鸡儿的水分利用效率最高,抗栓塞能力最强,抗旱性最好,同时柠条锦鸡儿可以通过减少蒸腾面积来减少水分的丧失。植物的导管直径大小、叶片厚度、LMA、叶脉密度对植物导水速率、光合速率等生理功能都有一定的影响。
英文摘要	Water stress is a main growth-limiting factor for plants in arid and semi-arid regions. In this study, we evaluated the hydraulic architecture traits and physiological functions of three Caragana genus species ( Caragana microphylla, Caragana intermedia, Caragana korshinskii) in different drought environments. The aim was to explore causes of ecological separation from ecological adaption strategies of three Caragana species. Field methods were used to survey morphological traits such as the first and secondary branch diameters and lengths. Measured hydraulic architecture traits included xylem conduit,leaf vein density,leaf thickness,and leaf mass area. The physiological functions included hydraulic conductance, photosynthesis, and water use efficiency. Our results showed that all three Caragana species had small conduit diameter structures to adapt to xeric environments, but also showed some differences in other hydraulic architecture traits. Conduit diameters of C. intermedia were smaller than those of the other species, whereas leaf minor vein density and maximum photosynthesis rates were the highest. Leaf thickness, leaf mass area, and conduits diameter of C. korshinskii were larger than those of the other species. Caragana microphylla showed the largest P_(50),suggesting that embolism was easier under water stress and xylem embolism reduced water transportation efficiency to maintain the requirements for growth by reducing the water supply in an arid environment. Caragana intermedia had reduced xylem conduit diameters to adapt to drought conditions. Caragana korshinskii exhibited the strongest ability to resist embolism and drought tolerance and reduced the water supply by decreasing the transpiration area. Xylem conduit size,leaf thickness,leaf mass area,and leaf vein density have important effects on plant physiology, such as hydraulic conductance and photosynthetic rate.
中文关键词	形态特征 ; 导水结构 ; 导水率 ; 干旱适应策略
英文关键词	morphological traits hydraulic architecture characteristics hydraulic conductance drought adaption strategies
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:6291463
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238132
作者单位	北京师范大学;;北京师范大学地理科学学部资源学院, 地表过程与资源生态国家重点实验室;;, ;;, 北京;;北京 100875;;100875, 中国
推荐引用方式 GB/T 7714	龚容,徐霞,田晓宇,等. 三种锦鸡儿属植物水力结构特征及其干旱适应策略[J]. 北京师范大学,2018,38(14):4984-4993.
APA	龚容,徐霞,田晓宇,江红蕾,李霞,&关梦茜.(2018).三种锦鸡儿属植物水力结构特征及其干旱适应策略.生态学报,38(14),4984-4993.
MLA	龚容,et al."三种锦鸡儿属植物水力结构特征及其干旱适应策略".生态学报 38.14(2018):4984-4993.