• 研究报告 •

### 海岸沙生植物老鼠艻（Spinifex littoreus）叶水势对风蚀、沙埋和风沙流磨蚀的响应

1. 1中山大学地理科学与规划学院， 广州 510275； 2广东省城市化与地理环境空间模拟重点实验室， 广州 510275）
• 出版日期:2017-05-10 发布日期:2017-05-10

### The responses of leaf water potential of a typical psammophyte Spinifex littoreus to wind erosion, sand burial and sand flow abrasion in coastal area of Pingtan Islan#br# d.

YANG Xian-ji1,2, DU Jian-hui1,2*, QIN Jing1,2, CHEN Zhi-hua1,2, YANG Lin1,2, LIN Ping1,2#br#

1. (1School of Geography and Planning, Sun YatSen University, Guangzhou 510275 China; 2 Guangdong Key Laboratory for Urbanization and Geosimulation, Guangzhou 510275, China).
• Online:2017-05-10 Published:2017-05-10

Abstract: Typhoon, as one of the most common natural disasters in coastal areas, can cause severe threats to the growth of psammophytes by wind erosion, sand burial and sand abrasion. Variations of leaf water potential of the psammophyte Spinifex littoreus under the threats of wind erosion, sand burial and sand abrasion were investigated and corresponding soil water potential, meteorological elements were measured simultaneously after occurrence of typhoon on Pingtan Island, Fujian Province. The results showed that S. littoreus suffered an earlier and more intense water stress after the wind erosion, and its leaf water potential significantly decreased compared with plants without suffering wind erosion (P<0.05), and there was no obvious correlation between leaf water potential and atmospheric water potential (P>0.05). However, the leaf water potential of plants without suffering wind erosion was positively correlated with the atmospheric water potential and relative humidity (P<0.01), while negatively correlated with the temperature (P<0.01). The leaf water potential of S. littoreus that suffered sand burial was higher than that of the ones without sand burial from 10:00 to 16:00, with small amplitude of variations, and lagging response to the meteorological factors. Besides, the leaf water potential of S. littoreus was mainly affected by soil water potential when soil moisture was insufficient, whereas the meteorological factors would become its major influencing factors if soil moisture was sufficient. The leaf water potential of the plants without sand burial was positively correlated with atmospheric water potential and relative humidity (P<0.05), but negatively with the air temperature (P<0.05). With the increasing depth of sand burial, the leaf water potential increase firstly and then decreased, indicating that moderate sand burial would help the plants maintain higher water potential for their adaptation to environmental stresses. Furthermore, the leaf water potential of the abrasive leaves was higher than that of the undamaged ones during most of time, correlating with the atmospheric water potential to an insignificant extent (P>0.05). Nevertheless, the correlations between the leaf water potential of undamaged leaves and atmospheric water potential, relative humidity and temperature were consistent with those of the plants without sand burial.