生态环境学报2011，Vol.20Issue(6)：1097-1101,5.
淀山湖沉水植物——苦草群落恢复影响因子研究
Effects of environmental factors on Vallisneria natans restoration in Lake Dianshan
摘要
Abstract
We conducted an experiment in Lake Dianshan to investigate the optimal environmental factors for the survival and regrowth of Vallisneria natans. Light intensity and DO were measured daily from August 12, 2010 to September 22, 2010 at four different depths (0.5, 1.0, 1.5 and 2.0 m) in Lake Dianshan. Plant growth indices, e.g., plant height, shoot length, and fresh weight were also measured every 10 days during the same period at each water depth. Statistical results showed that growth rate of Vallisneria natans was positively related to light intensity (r=0.905) and negatively related to depth. The relative growth rates were 0.14 and 0.11 in 0.5 and 1.0 m, respectively. Plant height, leaf number, and root length were higher in waters with depths of 0.5 and 1.0 m than in waters with depths of 1.5 and 2.0 m. Dissolved oxygen was greatly related to the survival rate of Vallisneria natans (r=0.935). About 86.5% of Vallisneria natans survived in depth of 1.0 m where DO was 5.66 mg-L"1, while only 46.5% survived in depth of 2.0 m where DO was 2.76 mg-L'1. We suggest to begin the restoration of Vallisneria natans in littoral zone, where depth is less than 1.0 m.关键词
沉水植被恢复/苦草/淀山湖Key words
recovery of submerged plant/Vallisneria natans/Dianshan lake分类
资源环境引用本文复制引用
赵风斌,徐后涛,王丽卿,季高华..淀山湖沉水植物——苦草群落恢复影响因子研究[J].生态环境学报,2011,20(6):1097-1101,5.基金项目
上海市科委重大项目(08DZ1203103) （08DZ1203103）
上海市重点学科水生生物学建设基金项目(s30701) （s30701）
