Nutrient contents of dominant seagrass species and their affecting factors in Hainan Province
-
摘要: 研究了海南新村港、黎安港、文昌和琼海(潭门)等地的优势海草种类海菖蒲(〖WTBX〗Enhalus acoroides〖WTBZ〗)、海神草(〖WTBX〗Cymodocea rotundata〖WTBZ〗)及泰来藻(〖WTBX〗Thalassia hemperichil〖WTBZ〗)中氮、磷及铁的含量和影响因素.研究结果表明,海南潮间带海草对养分的吸收与海水营养水平及沉积物氮、磷、有机碳、铁有关.相对于氮,海草叶片磷含量受海水和沉积物的影响更明显.海水磷、沉积物有机碳和铁均能促进海草组织对磷的吸收.海草叶片的氮磷比为新村港(21.73)黎安(14.25)文昌(9.53)潭门(10.29),与海水中溶解性总氮和溶解性无机磷的比值呈线性正相关,说明海水的富营养化影响了海草叶片的氮磷平衡.Abstract: Nutrient (N, P and Fe) contents of 〖WTBX〗Enhalus acoroides, Cymodocea rotundata〖WTBZ〗 and 〖WTBX〗Thalassia hemperichi〖WTBZ〗 dominated in the seagrass beds in Hainan were studied in this paper. The results indicated that nutrient uptake by inter-tidal seagrass was influenced by both N, P in seawater and chemical characteristics of sediments (N, P, TOC and Fe). Phosphorus concentration of seagrass, which was more sensitive to water and sediment than that of nitrogen, was positively correlated with the level of P in seawater and TOC and total Fe in sediment. Enhanced nutrient level induced by human activates has exerted imbalance of N and P uptake in seagrass, with the leaf N:P of Xincungang (21.73)Lian (14.25) Wenchang (9.53) Tanmen (10.29). The fact that leaf N:P had strong correlation with DTN:DIP in seawater has indicated the influence of eutrophication on the imbalance of nutrient uptake in seagrass.
-
Key words:
- seagrass /
- ratio of nitrogen to phosphorus /
- iron /
- eutrophication
-
[1] [1] STNER R W, ELSER J J. Ecological Stoichiometry: the Biology of Elements from Molecules to the Biosphere[M]. Princeton: Princeton University Press, 2002.[2] ANDERSON T R, BOERSMA M, RAUBENHEIMER D. Stoichiometry: linking elements to biochemicals[J]. Ecology, 2004, 85: 1193-1202.[3] HECK K. L J R, THORMAN T A. The nursery role of seagrass meadows in the upper and lower reaches of the Chesapeake Bay[J]. Estuaries, 1984(7): 70-92.[4] BOSTROM C, BONSDORFF E. Zoobenthic community establishment and habitat complexity—the importance of seagrass shoot-density, morphology and physical disturbance for faunal recruitment[J]. Marine Ecology Progress Series, 2000, 205: 23-138.[5] JONES C G, LAWTON J H, SHACHAK M. Positive and negative effects of organisms as physical ecosystem engineers. Ecology[J]. 1997, 78: 1946-1957.[6] UDY J W, DENNISON W C, LONG W J L. Responses of seagrass to nutrients in the great barrier reef[J]. Australia Marine Ecology Progress Series, 1999, 185: 257-271.[7] WAYCOTT M, DUARTE C M, CARRUTHERS T J B. Accelerating loss of seagrasses across the globe threatens coastal ecosystems[J]. Proceedings of the National Academy of Sciences, 2009, 106(30): 12377-12381.[8] 黄小平, 黄良民, 李颖虹. 华南沿海主要海草床及其生境威胁[J]. 科学通报, 2006, 增刊Ⅱ, 51: 114-119.[9] 范航清, 彭胜, 石雅君, 等. 广西北部湾沿海海草资源与研究状况[J]. 广西科学, 2007, 14(3): 289-295.[10] 黄道建, 黄小平, 黄良民. 海南岛新村湾营养负荷对海菖蒲的影响研究[J].海洋科学进展, 2007, 25(2): 200-207.[11] 黄道建, 黄小平, 黄正光. 海南新村湾海菖蒲TN和TP含量时空变化及其对营养负荷的响应[J]. 海洋环境科学, 2010, 29(1): 40-43.[12] PAGE A L, MILLER R H, KEENEY D R. Methods of Soil Analysis-Chemical and Microbiological Properties[M]. Wisconsin: Madison, 1982.[13] 鲍士旦, 土壤农化分析[M]. 北京: 中国农业出版社, 2005.[14] LONG M H, MCGLATHERY K J, ZIEMAN J C, et al. The role of organic acid exudates in liberating phosphorus from seagrass-vegetated carbonate sediments[J]. Limnology Oceanogry, 2008, 53: 2616-2626.[15] DUARTE C M, MERINO M, GALLEGOS M. Evidence of iron deficiency in seagrasses growing above carbonate sediments[J]. Limnol Oceanogr, 1995, 40: 1153-1158.[16] HABEEBREHMAN H, PRABHAKARAN M P, JACOB J, et al. Variability in biological responses influenced by upwelling events in the Eastern Arabian Sea[J]. Journal of Marine System, 2008, 74: 545-560.[17] FOURQUREAN J W, ZIEMAN J C. Nutrient content of the seagrass 〖WTBX〗Thalassia testdinum 〖WTBZ〗reveals regional patterns of relative availability of nitrogen and phosphrous in the Florida Keys USA[J]. Biogeochemistry, 2002, 61: 229-245.[18] DUARTE C M, CHISCANO C L. Seagrass biomass and production: A reassessment[J]. Aquatic Botany, 1999, 65: 159-174.[19] ATKINSON M J, SMITH S V. C〖DK〗∶N〖DK〗∶P ratios of benthic marine plants[J]. Limnology Oceanogry, 1983, 28: 568-574.[20] 海南省统计局,国家统计局海南调查总队.海南统计年鉴[M].北京: 中国统计出版社, 2009.[21] KAREN J M, PETER B, ROXANNE M. Using porewater profiles to assess nutrient availability in seagrass-vegetated carbonate sediments[J]. Biogeochemistry, 2001, 56: 239-263.[22] SERGIO R, STEPHEN A M, JAMES W F. The effects of manipulation of sedimentary iron and organic matter on sediment biogeochemistry and seagrasses in a subtropical carbonate environment[J]. Biogeochemistry, 2008, 87:113-126.[23] DUARTE C M, MERINO M, GALLEGOS M. Evidence of iron deficiency in seagrasses growing above carbonate sediments[J]. Limnol Oceanogr, 1995, 40: 1153-1158.[24] HUTCHINSON G E. A treatyise on Limnology[M]// Limnological Botany. New York: John Wiley and Sons Press, 1975(3).[25] HOLMER M, DUARTE C M, MARBA N. Iron additions reduce sulfate reduction rates and improve seagrass growth on organic-enriched carbonate sediments[J]. Ecosystems, 2005, 8(6): 721-730.[26] MONBET P, MCKELVIE I D, WORSFOLD P J. Phosphorus speciation, burial and regeneration in coastal lagoon sediments of the Gippsland lakes (Victoria, Australia)[J]. Environmental Chemistry, 2007(4): 334-346.[27] CROWDER A A, ST-CYR L. Iron oxide plaque on wetland roots[J]. Trends in Soil Science, 1991(1): 315-329.
点击查看大图
计量
- 文章访问数: 2973
- HTML全文浏览量: 85
- PDF下载量: 2132
- 被引次数: 0