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

生态学杂志

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

杨显基^1,2,杜建会^1,2*,秦晶^1,2,陈志华^1,2,杨林^1,2,林萍^1,2#br#

（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-ji^1,2, DU Jian-hui^1,2*, QIN Jing^1,2, CHEN Zhi-hua^1,2, YANG Lin^1,2, LIN Ping^1,2#br#

(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

摘要/Abstract

摘要： 台风是海岸地区常见的自然灾害之一，其通过风蚀、沙埋和风沙流磨蚀，严重威胁到该地区的沙生植物生长。本文以福建省平潭岛海岸典型沙生植物老鼠艻（Spinifex littoreus）为研究对象，对台风后受到风蚀、沙埋和风沙流磨蚀危害的植株叶片水势及其土壤水势和气象要素进行同步观测。结果表明：（1）老鼠艻在遭受风蚀后其受到的水分胁迫较未风蚀植株提前且强度更大，叶水势较未风蚀植株显著降低（P<0.05），且与大气水势无显著相关性（P>0.05）。而未风蚀时其与大气水势和相对湿度呈极显著正相关（P<0.01），与气温则呈极显著负相关（P<0.01）；（2）沙埋后老鼠艻叶水势在10:00—16:00均高于未沙埋植株，变化幅度较小，且对气象因子响应存在滞后现象。土壤水分不足时，老鼠艻叶水势主要受土壤水势的影响，土壤水分充足时，则主要受气象因子的影响。未沙埋的老鼠艻叶水势与大气水势、相对湿度呈显著正相关（P<0.05），与气温呈显著负相关（P<0.05）。随着沙埋深度的增加，老鼠艻叶水势先升高后降低，适度沙埋有利于其保持较高水势以适应胁迫环境；（3）老鼠艻叶片被擦伤后，其叶水势大部分时间均低于未擦伤处理，与大气水势有一定相关性，但不显著（P>0.05），而未擦伤植株叶水势则与大气水势和相对湿度呈显著正相关（P<0.05），与气温呈显著负相关（P<0.05）。

关键词: 气候区, 河南草地, 碳密度, 碳分布

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.

Key words: carbon density, Henan grassland, carbon distribution, climatic zone.

杨显基1,2,杜建会1,2*,秦晶1,2,陈志华1,2,杨林1,2,林萍1,2. 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[J]. 生态学杂志.

YANG Xian-ji1,2, DU Jian-hui1,2*, QIN Jing1,2, CHEN Zhi-hua1,2, YANG Lin1,2, LIN Ping1,2. 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. [J]. cje.

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