Effects of substrate on Vallisneria natans and Elodea canadensis under cyanobacterial stress conditions
WANG Xu, CHEN Xin-fang*, GUAN Bao-hua, LIU Zheng-wen
1. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, P. R. China; 2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
In order to investigate the relationships between the growth of submerged macrophytes and the nutrients condition of their substrates under cyanobacterial stress conditions, mesocosms were constructed to study the effects of two different substrates (the yellow clay with relative poor nutrient and the black sediment with rich nutrient) on the growth of two submersed aquatic macrophytes, i.e. Vallisneria natans and Elodea canadensis after adding the same biomass of fresh cyanobacteria to each mesocosm. The results showed that the biomass of V. natans in the yellow clay was higher than that in black sediment as compared to E. Canadensis. Meanwhile, the maximum leaf length and the number of the new ramets were higher in the yellow clay, and the maximum root length was significantly longer in the yellow clay than that in the black sediment. As for the E. Canadensis, there was no significant difference in biomass between the two substrates, but the length, the number and the dry biomass of the new branches of E. Canadensis were larger in the yellow clay. All those results suggest that under cyanobacterial stress conditions, the substrates with the high nutrition level is not favorable to the growth of submerged macrophytes; moreover, their effects on the rooted submerged macrophyte V. natans were larger than those on the rhizoid submerged macrophyte E. Canadensis.
[1] Krupa D, Kornijów R. Winter versus summer blooming of phytoplankton in a shallow lake: effect of hypertrophic conditions[J]. Polish Journal of Ecology, 2010, 68(1): 3-12.
[2] Paerla H W, Xu H, McCarthy M J, Zhu G, Qin B, Li Y, Gardner W S. Controlling harmful cyanobacterial blooms in a hyper-eutrophic lake (Lake Taihu, China): The need for a dual nutrient (N & P) management strategy[J]. Water Research, 2002, 45(5): 1973-1983.
[3] Ishikawa K, Kumagai M, Vincent W F, Michio K, Warwick F, VincentShigeo T, Hiroyuki N. Transport and accumulation of bloom-forming cyanobacteria in a large, midlatitude lake: the gyre- Microcystis hypothesis[J]. Limnology, 2002, 3(2): 87-96.
[4] Wu X, Kong F, Chen Y, Qian X, Zhang L, Yu Y, Zhang M, Xing P. Horizontal distribution and transport processes of bloom-forming Microcystis in a large shallow lake (Taihu, China)[J]. Limnologica, 2010, 40: 8-15.
[5] Berglund J, Mattila J, Rönnberg O, Heikkilä J, Bonsdorff E. Seasonal and inter-annual variation in occurrence and biomass of rooted macrophytes and drift algae in shallow bays[J]. Estuarine, Coastal and Shelf Science, 2003, 56: 1167-1175.
[6] Barron C, Middelburg J J, Duarte C M. Phytoplankton trapped within seagrass (Posidonia oceanica) sediments are a nitrogen source: An in situ isotope labeling experiment[J]. Limnology and Oceanography, 2006, 51(4): 1648-1653.
[7] 王洪君, 王为东, 卢金伟, 尹澄清. 植被型岸边带对藻类的捕获与水源保护研究[J]. 中国给水排水, 2006, 22(7): 1-3.
[8] 黄漪平, 范成新, 濮培民, 姜加虎, 戴全裕. 太湖水环境及其污染控制[M]. 北京: 科学出版社, 2001. 16-23.
[9] 雷泽湘, 谢贻发, 刘正文. 太湖梅梁湾不同沉积物对3 种沉水植物生长的影响[J]. 华中师范大学学报(自然科学版), 2006, 40(2): 260-264.
[10] 陈开宁, 陈小峰, 陈伟民, 刘恩生, 兰策介, 许海. 不同基质对四种沉水植物生长的影响[J]. 应用生态学报, 2006, 17(8): 1511-1516.
[11] 李宽意, 张强, 刘正文. 东太湖四角菱(Trapa quadrispinosa)生长特性[J]. 生态学报, 2009, 29(7): 3947-3951.
[12] 朱梦圆, 朱光伟, 王永平. 太湖蓝藻水华衰亡对沉积物氮、磷释放的影响[J]. 环境科学, 2011, 32(2): 409-415.
[13] 朱伟, 万蕾, 赵联芳. 不同温度和营养盐质量浓度条件下藻类的种间竞争规律[J]. 生态环境, 2008, 17(1): 6-11.
[14] 王小冬, 秦伯强, 高光, 朱光伟, 刘兴国. 无机氮磷添加对太湖来源浮游植物和附着生物生物量的影响[J]. 生态学杂志, 2011, 30(10): 2257-2261.
[15] Barko J W, Gunnison D G, Carpenter S R. Sediment interactions with submerged macrophytes growth and community dynamics[J]. AquatBot, 1991, 41: 41-65.
[16] Rattray M R, Howard-Williams C, Brown J M A. Sediment and water as sources of nitrogen and phosphorus for submerged rooted aquatic macrophytes[J]. Aquatic Botany, 1991, 40: 225-237.
[17] 李宽意, 刘正文, 杨宏伟, 宋晓兰, 文明章. 螺类牧食与沉积物类型对苦草生长的影响[J]. 生态学报, 2007, 27(11): 4907-4912.
[18] 张雷燕, 李柯, 刘正文. 太湖不同污染程度底泥对磷滞留能力的比较[J]. 农业环境科学学报, 2010, 29(3): 546-550.
[19] Madsen V T, Cedergreen N. Sources of nutrients to rooted submerged macrophytes growing in a nutrient-rich stream[J]. Freshwater Biology, 2002, 47: 283-291.
[20] Denny P. Sites of Nutrient Absorption in Aquatic Macrophytes[J]. The Journal of Ecology, 1972, 60(3): 819-829.
