Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China.
Mar Pollut Bull. 2014 Dec 15;89(1-2):229-238. doi: 10.1016/j.marpolbul.2014.09.054. Epub 2014 Oct 17.
Seagrasses that are distributed over a large area of the Swan Lake, Weihai, China, support a productive ecosystem. In recent years, however, frequent macroalgal blooms have changed the ecosystem structure and threatened the seagrasses. To understand the bloom-forming macroalgae we conducted a yearly field survey of Swan Lake. Results indicated that the macroalgae Chaetomorpha linum and Ulva pertusa both exhibited a much higher productivity and attained a greater maximum biomass (of 1712±780gDWm(-)(2) and 1511 ± 555 gDW m(-2), respectively) than was the case for the seagrasses. The mean annual atomic ratios of C/N, C/P and N/P in C. linum were 14.31 ± 4.45, 402.82 ± 130.25, and 28.12±2.08, respectively. The δ(15)N values (11.09 ± 0.91‰ for C. linum; 9.27 ± 2.83‰ for U. pertusa) indicated a land-based source of N enrichment to the macroalgal blooms. High concentrations of nitrogen and phosphorus in the lagoon, particularly near the river mouth, supported the blooms.
分布于中国威海天鹅湖大面积区域的海草为一个多产的生态系统提供了支持。然而，近年来频繁发生的大型海藻水华改变了生态系统结构，威胁到了海草的生存。为了了解形成水华的大型藻类，我们对天鹅湖进行了一年一度的实地调查。结果表明，大型藻类石莼和孔石莼的生产力都比海草高得多，最大生物量分别达到 1712±780gDWm(-)(2)和 1511 ± 555 gDW m(-2)。石莼的 C/N、C/P 和 N/P 平均年原子比分别为 14.31 ± 4.45、402.82 ± 130.25 和 28.12±2.08。δ(15)N 值（石莼为 11.09 ± 0.91‰；孔石莼为 9.27 ± 2.83‰）表明，氮的富集来自于陆源。泻湖，特别是河口附近，高浓度的氮和磷支持了藻类的大量繁殖。
