菹草附着物对营养盐浓度的响应及其与菹草衰亡的关系  

Response of periphyton to nutrient level and relationships between periphyton and decay degree of Potamogeton crispus

作　　者：魏宏农[1] 潘建林[2] 赵凯[1] 李旭光[2] 王国祥[1] 傅玲[1] 李振国[1] 

机构地区：[1]南京师范大学地理科学学院,南京210046 [2]江苏省淡水水产研究所,南京210017

出　　处：《生态学报》2013年第24期7661-7666,共6页Acta Ecologica Sinica

基　　金：科技部国际合作重大资助项目(2010DFB33960);江苏省科技厅社会发展支撑资助项目(BE2009690);国家自然科学基金资助项目(40873057;41173078)

摘　　要：在菹草衰亡阶段对5个静水水体中菹草叶片表面附着物进行野外调查,并将其与水体营养盐浓度、沉水植物衰亡程度进行相关性分析。附着物共调查Chl.a含量、干重、有机质含量和藻类数量4个指标,沉水植物衰亡程度用单位面积叶片Chl.a含量表示,水体营养盐含量测量了TP、TN和N/P 3个指标。结果显示:附着物生物量与水体营养盐状况存在一定的正相关;各个点的附着物生物量与菹草衰亡状况存在一定相关性但相关性趋势与水体污染程度有关。在污染程度较高的水体中附着物生物量与菹草衰亡程度呈正相关,在污染程度较低的水体中附着物生物量与菹草衰亡程度呈负相关。结论为富营养化湖泊中营养盐含量的增加会导致附着物生物量的增加,但附着物只在污染程度较高的水体中促进植物衰亡。Most shallow lakes in China are eutrophic or eutrophicating, which are accompanied by aquatic plant disappear. The most effective method of controlling internal nutrient loading may be to restore the macrophytes especially submerged plants in eutrophic lakes, but this method may not success because epiphytic algae which can be increased by high nutrient inload can decrease photosynthetic available radiation of submerged plants, so it is necessary to research the relationship between periphyton and aquatic plants on different water nutrient levels. In this study, periphyton on leaves of Potamogeton crispus, water nutrient level and plant＇s decay degree were investigated in five ponds which were dominant with P. crispus community and located in the northeast of Nanjing. DW, TOC, Chl.a content, and algae cell counts of periphyton were measured for expressing periphyton characteristics, Chl.a content of P. crispus leaves were measured to indicate plant＇s decay degree, TN and TP were measured for discripting the water nutrient level, then correlation among periphyton characteristic, plant＇s decay degree, and water nutrient level were analyzed. Results show that： i） there is a significant correlation between biomass of epiphytic algae and water nutrient level; ⅱ） there is a certain correlation between biomass of periphyton and plant＇s decay degree, but correlation trend existed difference between different location, two of them are positive and the other three are negative; ⅲ） biomass of periphyton has a negative correlation with plant＇s decay degree at locations with higher water pollution degree, on the contrary, when the water pollution degree is low, there is a positive correlation between biomass of periphyton and plant＇s decay degree. We conclude that high water nutrient level can promote the growth of epiphytic algae, but periphyton increase aquatic plant decay only in the case of waters with higher pollution degree.

关 键 词：附着物 附植藻类 营养盐浓度 菹草 

分 类 号：X173[环境科学与工程—环境科学]