胡杨(Populus euphratica)叶片结构与功能关系

doi:10.7522/j.issn.1000-694X.2017.00049

摘要/Abstract

摘要： 叶片形态特征与功能性状可以反映植物采取的协同或权衡策略。测定了塔里木河下游不同地下水埋深下荒漠河岸林建群种胡杨（Populus euphratica）的叶片解剖结构、叶片水力导度、叶片δ¹³C值，探讨了胡杨结构性状指标和功能指标对地下水埋深的响应，叶片水力传输能力与叶片解剖结构变化趋势，以及叶片水力参数、解剖结构与水分利用效率的相关关系。结果表明：（1）胡杨叶片结构指标（叶片厚度、表皮厚度、栅栏组织厚度、气孔参数、叶脉密度、主脉导管直径）、功能指标（叶片最大水力导度、水分利用效率、比叶质量）在地下水埋深最深处与地下水埋深最浅处差异显著；（2）不同地下水埋深下胡杨水分传输能力变化有解剖结构基础，叶片水分传输能力与水分散失能力存在协同关系；（3）胡杨叶片水分利用效率与叶片解剖结构指标（叶片厚度、栅栏组织厚度、表皮厚度、气孔长度、气孔宽度、气孔密度）具有相关关系；（4）胡杨叶片水分传输与叶片碳投资具有协同关系。

关键词: 叶片水力参数, 叶片解剖结构, 水分利用效率, 胡杨(Populus euphratica)

Abstract: Leaf morphological and functional traits reflect the trade-off or coordinate strategies adopted by plants when they adapt to environmental stress. The study was conducted on Populus euphratica the constructive species of the riparian forest in the lower reaches of Tarim River.We measured leaf anatomical traits, leaf hydraulic conductance, δ¹³C values of P.euphratica grown at different groundwater depths, discussing how morphological and functional traits response to variation in groundwater depth. We also assessed the variation trend between hydraulic conductance capacity and anatomical structure, as well as analyzed the correlations between leaf hydraulic parameters, anatomical traits and water use efficiency. The results showed that:(1) Leaf anatomical traits (leaf thickness,epidermal thickness, palisade tissue thickness,stomatal parameters,vein density, main vein diameter) and functional traits (maximum leaf hydraulic conductance, water use efficiency, leaf mass per area) changed significantly in the deepest groundwater depth compared with them in the shallowest groundwater depth. (2) The variation in water transport capacity of P.euphratica under different groundwater depths has its anatomical structure basis;there was a coordinate relationship between leaf water transport and water loss. (3) Correlations were found between leaf anatomical traits (leaf thickness,palisade tissue thickness, epidermal thickness,stomatal length, stomatal width, stomatal density) and water use efficiency. (4) Co-ordinate relationship existed between leaf water transport and carbon investment.

Key words: leaf hydraulic traits, leaf anatomical structure, water use efficiency, Populus euphratica

中图分类号:

Q944.3

潘莹萍, 陈亚鹏, 王怀军, 任志国. 胡杨(Populus euphratica)叶片结构与功能关系[J]. 中国沙漠, 2018, 38(4): 765-771.

Pan Yingping, Chen Yapeng, Wang Huaijun, Ren Zhiguo. Leaf Structure and Functional Traits of Populus euphratica[J]. Journal of Desert Research, 2018, 38(4): 765-771.

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