海人树的生态生物学特性

Suriana maritima (Surianaceae) is a coastal ornamental plant species distributing only on theSouth China Sea Islands in China, at present. In order to understand the ecological and biologicalcharacteristics of S. maritima, and provide a theoretical basis for its protection, development andutilization, we investigated the morphological and anatomical structure of stem and leaf, the antioxidantenzyme activity and osmotic adjustments contents in leaf of S. maritima, and nutrient element contents in leaf and the soil S. maritima growing on the Paracel Islands, by field investigation and sampling foranalysis. The results showed that S. maritima have small and thick leaf, well-developed palisade tissue,and low stomatal density (8.64 nmm-2), which make it easy to maintain water in the body and suitablefor drought and high saline-alkali environment. The chlorophyll content (0.76 mgg-1) of the leaf waslow, the total antioxidant capacity (589.50 Ug-1) and proline content (1 123.64 gg-1) were high,indicating that S. maritima had high photosynthetic utilization efficiency and strong antioxidant capacity.Though the nutrient in natural growing soil was poor, the contents of organic carbon, nitrogen andphosphorus in leaf of S. maritima were relatively high (490.27, 18.10, and 3.81 gkg-1, respectively),indicating a high nutrient utilization efficiency and good adaptability of S. maritima to poor soil.Therefore, S. maritima had a good adaptability to the environment of strong radiation, drought, highsaline-alkali and poor soil on tropical coral islands, and could be used as a tool species for revegetationand landscaping on tropical coral islands.