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香港吐露港汀角砂砾质海岸硬底型红树林面积８７７ｈｍ２，由窄条状密集灌丛与小乔木组成，其分布与群落结构受地貌、底质和潮汐浸淹频率的显著控制，其捕沙促淤生物地貌功能对红树林潮滩沉积和地貌过程有显著影响。硬底型红树林生物地貌功能比软底型红树林弱，但同属于海岸生态关键区而应加以妥善保护。
The area of hard bottom mangroves in Hong Kong’s Tung Kok gravel coast is 877hm2, which consists of narrow strip-shaped shrubs and small trees. Its distribution and community structure are significantly controlled by the geomorphology, sediment quality and frequency of tidal inundation. Sediment deposition and sedimentation enhanced the biological landscape features of mangroves tidal flat sedimentation and landscape processes have a significant impact. Hard-bottom mangroves bio-landscape features than the soft-bottom mangroves weak, but belong to the key areas of coastal ecology and should be properly protected.