盐分对滨海湿地植物番杏生长和光合特征的影响

生态学杂志

盐分对滨海湿地植物番杏生长和光合特征的影响

贺林¹,王文卿¹,林光辉^1,2**

（¹滨海湿地生态系统教育部重点实验室，厦门大学环境与生态学院，厦门 361005； ²清华大学地球系统科学研究中心暨全球变化研究院，北京 100084）

出版日期:2012-12-10 发布日期:2012-12-10

Effects of salinity on the growth and photosynthetic characteristics of a coastal wetland plant species Tetragonia tetragonoides (Pall.) Kuntze.

HE Lin¹, WANG Wen-qing¹, LIN Guang-hui^1,2**

(¹Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, China; ²Center for Earth System Science and Institute of Global Change, Tsinghua University, Beijing 100084, China)

Online:2012-12-10 Published:2012-12-10

摘要/Abstract

摘要： 筛选耐盐又具有重要经济价值的植物品种是滨海地区生态修复工程的关键。本研究通过砂培方式对番杏（Tetragonia tetragonoides）幼苗进行不同盐度（0、100、200、300、400、600 mmol·L^-1）处理，7周后测定其生长指标、生物量、光合和荧光参数，探讨番杏的耐盐能力。结果表明：番杏生长的适宜盐度范围为0～400 mmol·L^-1，受抑制盐度为600 mmol·L^-1，说明番杏是一种耐盐性较高的盐生植物；番杏叶片净光合速率、气孔导度和蒸腾速率均随盐度的增加而降低，气孔限制值则相反；高盐通过影响番杏光合系统Ⅱ反应中心的关闭程度、光化学反应吸收光的比例和电子传递速率来抑制叶片光合速率，从而降低其生长速率；番杏是一种耐盐性高、具有食用价值的盐生植物，值得在滨海湿地生态修复工程重点推广。

Abstract: In any ecological restoration project in coastal areas, it is crucial to select suitable plant species with high salt tolerance and economic significance. In this study, Tetragonia tetragonoides seedlings were sand-cultured with nutritional solution of different salinities (0, 100, 200, 300, 400, and 600 mmol·L^-1), and the seedling growth indices, biomass, and photosynthetic and chlorophyll fluorescence parameters were determined after 7-week growth, aimed to approach the salt tolerance of T. tetragonoides. The suitable salinity for T. tetragonoides growth was 0-400 mol·L^-1, with an upper limit of 600 mol·L^-1, suggesting that T. tetragonoides was a halophyte with higher salt tolerance. The net photosynthetic rate, stomatal conductance, and transpiration rate of T. tetragonoides leaves decreased significantly with increasing salinity, but the stomatal limiting value showed an opposite trend. High salinity could inhibit the leafnet synthetic rate via affecting the closure rate of PSⅡ reaction center, the proportion of the light absorption of photochemical reaction, and the electron transfer rate, and thus, decrease the growth rate of T. tetragonoides. This study showed that T. tetragonoides was a halophyte with high salt tolerance and edible value, and worthy to be popularized in the ecological restoration of coastal wetland.

贺林1,王文卿1,林光辉1,2**. 盐分对滨海湿地植物番杏生长和光合特征的影响[J]. 生态学杂志.

HE Lin1, WANG Wen-qing1, LIN Guang-hui1,2**. Effects of salinity on the growth and photosynthetic characteristics of a coastal wetland plant species Tetragonia tetragonoides (Pall.) Kuntze.[J]. cje.