摘要
以东兴河桥为起点 ,1km为单位尺度 ,将北仑河口岸线划分为 12个岸段 ,其中第 12岸段长为 2 km。在各岸段进行优势群落样方调查 ,同一群落选 3个样方 ,每样方面积 16 m2。用取土器钻取各群落 2 0 cm～ 40 cm土层土壤 3份 ,用于测定土壤含水量、全 N和全 P。广西北仑河口的红树林由 7种红树植物和 6种群落类型组成。与广西其它海岸相比 ,老鼠和卤蕨群落在该河口发育良好。严重的滩涂侵蚀、红树林生境的破碎和土壤养分的明显缺乏是北仑河口次生红树林自然恢复困难的主要原因。不同的红树植物生长在不同的岸段是对盐度响应的结果。北仑河口 13km长的岸线可大体上划分为内河 (2 km )、河口 (5 km )、近海河口 (2 km)、近海 (3km ) 4个生态区间。应用工程的方法提高滩涂的高程 。
The coastline of Beilun Estuary,Guangxi,China was divided into 12 sections starting from Dongxing Bridge in field survey. Each section is 1 km except that Section 12 is 2 km.Three sampling spots were selected in each dominant community,and each spot is 16 m 2. Three duplicates of soil samples were collected at the soil of 20 cm to 40 cm depth in each dominant community for determining water content, whole N and whole P of the soil. Seven mangrove species with six types of communities were identified for the mangroves along coasts of Beilun Estuary. The communities of Acanthus illicifolius and Acrostichum aureum develop better in this estuary than the other coasts of Guangxi. The severe erosion of intertidal lands, fragmentation of habitats and the obvious deficiency in soil nutrients are responsible for difficultly natural restoration of the secondary mangroves. The growth patterns of mangroves in the coastal sections are sensitive to salinity. The 13 km long coastline could be roughly divided into four ecological intervals of freshwater(2 km), estuary(5 km), inshore estuary(2 km) and inshore(3 km). To more protect the remaining mangroves, the increase of elevation of eroded intertidal lands by engineering means and the introduction of new mangrove species would be critical for the ecological restoration of Beilun mangroves.
出处
《广西科学》
CAS
2001年第3期210-214,共5页
Guangxi Sciences
基金
国家自然科学基金 (498660 0 1)
桂科配 (9912 0 13 )
广西"十百千人才工程"专项资金 (桂人函 [1998] 3 5 4)资助项目
