• 研究论文 •

### 不同土壤水分条件下洪泛平原湿地芨芨草叶片厚度与叶脉性状的关系

1. 西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州 730070
• 出版日期:2017-05-10 发布日期:2017-06-22
• 通讯作者: 赵成章
• 作者简介:

* 通信作者Author for correspondence (E-mail:sunzhiqiang1956@sina.com)

### Relationships between leaf thickness and vein traits of Achnatherum splendens under different soil moisture conditions in a flood plain wetland, Heihe River, China

Ling HAN, Cheng-Zhang ZHAO*, Ting XU, Wei FENG, Bei-Bei DUAN

1. College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China
• Online:2017-05-10 Published:2017-06-22
• Contact: Cheng-Zhang ZHAO
• About author:

KANG Jing-yao(1991-), E-mail: kangjingyao_nj@163.com

## 被引次数

5

Abstract:

Aims The correlations between leaf thickness and vein traits influenced the leaf hydraulic dynamic balance, and there were important meanings to reveal ecophysiological mechanisms of plant leaves water transport and growth rate. Our objective was to study the changes in the relationship between leaf thickness and vein traits (vein diameter, vein density) of Achnatherum splendenspopulations by using standardized major axis estimation (SMA) method under different soil moisture conditions located in flood plain wetland of Zhangye.Methods The study site was located at flood plains wetland of Zhangye, Gansu Province, China. Selecting a starting point along the vertical direction of the river, in turn, along the soil moisture gradient, four plots were set up at intervals of 40 m, plot I (50.07%), plot II (38.77%), plot III (31.5%) and plot IV (20.4%). From each of the four sample plots, seven samples were collected, resulting in (5 m × 5 m) a total of 28 samples. Community traits (height, density) and soil physical and chemical properties were investigated. Six individual samplings of A. splendens from each plot were used to measure the leaf thickness, vein density and vein diameter in laboratory. In addition, the photosynthetically active radiation (PAR), leaf net photosynthetic rate (Pn) and transpiration rate (Tr) of A. splendens were measured in natural environment. The 28 plots were categorized into groups I, II, III and IV, and SMA estimation method was then used to examine the allometric relationship among leaf thickness, vein density and vein diameter. Important findings With a decreased soil moisture, the plant density and height displayed a pattern of steadily declining, while the soil electrical conductivity increased, In addition, the vein density, leaf thickness, water use efficiency (WUE), PAR and twig number of A. splendens displayed a pattern of initial decrease, whereas the vein diameter and Tr increase gradually, Pn and plant high displayed changing trends of increasing-decreasing. The leaf thickness was negatively associated with the vein density, vein diameter, and the relationship varied with the soil moisture conditions (p< 0.05). There was a significant positive relationship (p < 0.05) between the leaf thickness and vein density. The SMA slope of the regression equation gradually decreased and was significantly different from 1.0 (p < 0.05) on plot I and IV. In addition, along decreased soil moisture, the standardized major axis slope of regression equation in the scaling relationships between the leaf thickness and vein diameter gradually increased and was significantly different from -1.0 (p < 0.05) on plot I and IV.