沙柳和柠条茎水力学特性对模拟降雨改变的响应

doi:10.13287/j.1001-9332.201802.017

应用生态学报 ›› 2018, Vol. 29 ›› Issue (2): 507-514.doi: 10.13287/j.1001-9332.201802.017

沙柳和柠条茎水力学特性对模拟降雨改变的响应

陈丽茹¹, 李秧秧^2,3*

¹西北农林科技大学林学院, 陕西杨凌 712100;
²西北农林科技大学水土保持研究所, 陕西杨凌 712100;
³中国科学院水利部水土保持研究所, 陕西杨凌 712100

收稿日期:2017-07-05 出版日期:2018-02-18 发布日期:2018-02-18
通讯作者: E-mail: yyli@ms.iswc.ac.cn
作者简介:陈丽茹, 女, 1992年生, 硕士研究生. 主要从事植物水分生理生态研究. E-mail: 493705238@qq.com
基金资助:
本文由国家自然科学基金项目(41371507,41530854)资助

Responses of stem hydraulic traits in Salix psammophila and Caragana korshinskii to manipulated precipitation variation.

CHEN Li-ru¹, LI Yang-yang^2,3*

¹College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China;
²Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China;
³Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China

Received:2017-07-05 Online:2018-02-18 Published:2018-02-18
Contact: E-mail: yyli@ms.iswc.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (41371507, 41530854).

摘要/Abstract

摘要： 利用模拟降雨控制试验(对照、降雨增加45%和减少50%),研究了黄土高原水蚀风蚀交错带典型灌木沙柳和柠条茎水力学特性对模拟降雨改变的响应,以揭示两种灌木对未来降雨改变的适应性.结果表明: 沙柳茎比导水率(K_s)、比叶导水率(K_l)和Huber值对增水有显著响应,而对干旱无显著响应;柠条黎明前和正午叶水势、水分传输效率(K_s及K_l)对干旱有显著响应,但对增水无响应.两种灌木不同处理间抵抗栓塞能力无显著差异,沙柳不同处理间正午原位栓塞程度亦无显著差异,而柠条干旱处理正午原位栓塞程度显著增大.沙柳增水处理导管直径和导管面积占边材面积的比例显著增加,干旱导致沙柳导管密度显著增大,水力直径变小;柠条增水处理的木质部结构无明显改变,干旱导致其导管密度和木材密度显著增加.说明增水提升了沙柳的水力功能,而长期干旱显著降低了柠条水力功能,预测在未来气候旱化条件下,柠条的水力适应性可能不如沙柳.

Abstract: With a precipitation manipulation experiment (Control, +45% and -50%), the responses of stem hydraulic traits in two dominant shrubs (Salix psammophila and Caragana korshinskii) of water-wind erosion crisscross region of the Loess Plateau to projected precipitation variation were examined to elucidate their adaptability to future precipitation changes. Results showed that the specific hydraulic conductivity (K_s), leaf specific conductivity (K_l) and Huber value in S. psammophila increased significantly by irrigation but showed no responses to drought. The predawn and midday leaf water potential and water transport efficiency (K_s and K_l) in C. korshinskii decreased significantly by drought, and showed no responses to irrigation. The embolism resistance across different treatments did not differ in the two shrubs. The midday native embolisms across treatments in S. psammophila were almost the same. Drought increased midday native embolism in C. korshinskii. Irrigation increased conduit diameter and conduit area per stem sap area while drought increased the vessel density and decreased the hydraulic diameter in S. psammophila. Irrigation had no effect on xylem anatomy, whereas drought increased the vessel density and wood density in C. korshinskii. These results indicated that irrigation promoted stem hydraulic function in S. psammophila, and drought decreased stem hydraulic function in C. korshinskii. C. korshinskii may be less resistant to future dry climate than S. psammophila.

陈丽茹, 李秧秧. 沙柳和柠条茎水力学特性对模拟降雨改变的响应[J]. 应用生态学报, 2018, 29(2): 507-514.

CHEN Li-ru, LI Yang-yang. Responses of stem hydraulic traits in Salix psammophila and Caragana korshinskii to manipulated precipitation variation.[J]. Chinese Journal of Applied Ecology, 2018, 29(2): 507-514.

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沙柳和柠条茎水力学特性对模拟降雨改变的响应

Responses of stem hydraulic traits in Salix psammophila and Caragana korshinskii to manipulated precipitation variation.

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