Distribution Characteristics of Chlorophyll A among Different Mangrove Species in Dongzhai Port Mangrove

Abstract

红树林具有防风消浪、促淤保滩、固岸护堤、净化海水和空气的功能。本研究在四个季节分别采集角果木、卤蕨、榄李、水椰、秋茄、木果楝、尖瓣、杯萼海桑、海南海桑、海莲、木榄、红海榄、桐花、白骨壤和卵叶海桑树下沉积物，按照《海洋调查规范》分别测定0~2 cm、2~5 cm和5~8 cm深度叶绿素a含量。结果显示，叶绿素a含量全年平均1.7308 ± 0.6510 μg·g−1，在海莲站点叶绿素a含量最高3.2960 ± 2.0909 μg·g−1，显著高于白骨壤、水椰、卤蕨、榄李、木果楝、卵叶海桑、角果木和秋茄植被下含量(0.01 ≤ p ≤ 0.05)。海莲采样点含量与杯萼海桑、木榄、尖瓣、红海榄、海南海桑和桐花有差异不显著(0.05 ≤ p ≤ 0.1)，为叶绿素a高浓度区。叶绿素a水平分布呈现由浅海区到近岸逐渐由低到高的趋势。垂直分布，在0~8 cm深度中叶绿素a含量较低，在0~2 cm表层叶绿素a含量最高。统计分析表明，四个季节叶绿素a含量差异显著(p > 0.01)。研究测定了东寨港15种不同红树植物种类间叶绿素a的分布特征，为红树林保护区的监测及综合保护提供基础资料。 Mangrove have the functions of preventing wind and waves, accelerating silting and protecting beaches, fixing bank dikes, and purifying seawater and air. In this experiment, 15 sampling points were set up for sampling in four seasons. The 15 sampling points were respectively of hornbeam, Brassica, R. sylvestris, S. sylvestris, K. candel, K. sylvestris, Caudal Flap, Sonneratia alba, Hainan Sea mulberry, Bruguiera sexangula, hibiscus, red sea urchin, Paulownia, Avicennia marina and Sonneratia ovata. Three samples of different depth layers were taken at each sampling point, which were 0 - 2 cm, 2 - 5 cm and 5 - 8 cm depth layers respectively. The chlorophyll a content was determined by spectrophotometry in the Ocean Survey Code. From the horizontal distribution, the chlorophyll a content was 1.7308 ± 0.6510 μg·g−1 for the whole year. The chlorophyll a content in the site of Bruguiera sexangula was the highest 3.2960 ± 2.0909 μg·g−1, which was significantly higher than that under the vegetation types of Avicennia marina, S. arborescens, Brassica chinensis, R. sylvestris, C. sylvestris, C. sylvestris, C. sylvestris and Kandelia candel (0.01 ≤ p ≤ 0.05). There is no significant difference between the sampling points of Bruguiera sexangula and Sonneratia alba, hibiscus, cusps, red sea lam, Hainan sea mulberry and Paulownia (0.05 ≤ p ≤ 0.1), so they formed a high concentration zone. The horizontal distribution data of chlorophyll a content showed a trend of gradually increasing from low to high from shallow sea to near shore. From the vertical distribution, the chlorophyll a content was the lowest in the depth of 0~8cm and the highest in the surface of 0 - 2cm. Statistical analysis showed that the content of chlorophyll a in the four seasons was significantly different (p>0.01). The distribution characteristics of chlorophyll a among 15 species of mangrove plants in dongzhai port were determined to provide basic data for monitoring and comprehensive protection of mangrove reserve.