中文摘要：

植物根系分泌物中酚酸类物质具有较强化感活性，但对红树植物相关研究很少，特别是对原位状况的研究。本研究采集广东湛江国家级自然保护区内六种建群红树植物的根系、根际土与非根际土样品，采用铁氰化钾与三氯化铁显色法进行酚酸总量的测定，对结果进行比较：红海榄根系酚酸总量最高，平均值为8837．28μg／g。木榄根际土与非根际土酚酸总量平均值最高，分别为13．20μg/g、20．12μg／g。在18个样品中，只有8个样品根际土酚酸总量高于非根际土。根际土中酚酸含量有可能因微生物分解或土壤吸附及降解的综合作用而低于非根际土中含量。红树植物根系酚酸百分释放量很低，红海榄仅为0．0504％。该领域的研究对厘清红树林生态机制尤其是根系微生态的作用机制具有重要意义。

英文摘要：

Phenolic acids in plant root exudates have stronger allelopathic activity, but fewer researches are focus on this area of mangrove plants, especially the status in situ conditions. In this work, the roots, rhizosphere soil and non rhizosphere soil of six plants in Guangdong Zhanjiang National Nature Reserve of mangrove were sampled in situ. The total content of phenolic acids was measured using a potassium ferri- cyanide-ferric chloride colorimetric method. The results indicated that the content in roots was the highest in Rhizophora stylosa, the average value was 8 837.28 μg/g. The content of phenolic acids in rhizo- sphere soil and non rhizosphere soil were the highest in Bruguiera gymnorrhiza, the mean value were 13.20 μg/g and 20. 12 μg/g, respectively. In total 18 samples, only 8 samples of the content in rhizo- sphere soils were higher than that of non rhizosphere soil. The content of phenolic acid in rhizosphere soil may be lower than that in non rhizosphere soil due to the comprehensive effect of microbial decomposition or soil adsorption and degradation. The release percent of phenolic acid from mangrove root was very low, only 0. 050 4% in Rhizophora stylosa. These results are important meaning for clarifing the mangrove eco- logical mechanism especially the mechanism of root microecology.