中文摘要：

红树植物的化感作用和生态功能与其多酚类物质的组成和含量密切相关,其植物根系中含有的小分子多酚对红树植物对根际生物群落的调控具有重要的意义,但对其根系中具体含有的多酚类最小单体尚缺少科学实验证据。对湛江红树林国家级自然保护区内五种重要建群红树植物进行原位根系采样,采用液相高效色谱法（HPLC）对5种主要的小分子多酚单体进行定性和定量分析。主要结果为：五种红树根系内均检测出5种小分子多酚单体,浓度含量范围在0.0007—1.7424 mg/g DW。红树植物单株含量最高值分别为,儿茶素1.7424 mg/g DW,棓儿茶素1.1470 mg/g DW,表棓儿茶素0.4457 mg/g DW,没食子酸0.2374 mg/g DW,表儿茶素0.3331 mg/g DW。5种小分子多酚含量的总平均值以秋茄（Kandelia candel）和低潮带桐花树（Aegiceras corniculatum）最高,分别为0.2778 mg/g DW、0.2379 mg/g DW。木榄（Bruguiera gymnorrhiza）和无瓣海桑（Sonneratia apetala）次之,依次为0.0766 mg/g DW、0.0734 mg/g DW。红海榄（Rhizophora stylosa）和高潮带桐花树（A.corniculatum）相对最低,分别为0.0488 mg/g DW、0.0341 mg/g DW。

英文摘要：

The allelopathy of mangrove plant and its ecological function is closely related to the constitution and content of polyphenols substances. Micro-molecule polyphenols in mangrove roots are important in regulation on the rhizosphere communities. However, the scientific experimental evidence to polyphenol monomers in the root remains scarce. Root samples of five important constructive mangrove plants were collected in situ during low tide in Zhanjiang Mangrove National Nature Reserve, Guangdong, China. Five micro-molecule polyphenol monomers were analyzed by liquid phase high performance chromatography（HPLC） qualitatively and quantitatively. All the five monomers were detected in five species of mangrove plant roots in concentration range from 0.0007—1.7424 mg/g DW. The highest content of monomer in single plant was catechin（C） 1.7424 mg/g DW, followed by in turn, gallocatechin（GC） 1.1470 mg/g DW, epigallocatechin（EGC） 0.4457 mg/g DW, gallic acid（GA） 0.2374 mg/g DW, and epicatechin（EC） 0.3331 mg/g DW, respectively. In total average of the five monomers, Kandelia candel and Aegiceras corniculatum ranked top for 0.2778 mg/g DW and 0.2379 mg/g DW; Bruguiera gymnorrhiza and Sonneratia petala were the next for 0.0766 g DW and 0.0734 mg/g DW; and Rhizophora stylosa and A. corniculatum（low tide）, the lowest, 0.0488 g DW and 0.0341 mg/g DW, respectively.