摘要
水生植物修复已经成为水体富营养化修复的重要手段,但其周期性的衰亡也给水体带来不容忽视的负效应.以府河流域丘陵地带农业区小水系自然生长的芦苇(Phragmites australis)和狭叶香蒲(Typha angustifolia)为研究对象,通过模拟实验,研究其冬季和春季腐烂分解过程的差异以及对水体营养盐水平的影响.结果表明,2种挺水植物的剩余干物质量整体上都呈现先快速下降再缓慢下降的趋势,芦苇和狭叶香蒲春季的分解速率分别为0.0251和0.0169 d^(-1),分别明显高于冬季分解速率(0.0027和0.0052 d^(-1));且腐烂分解速率与植物初始氮磷含量和氮磷比都有一定相关性.2种植物在冬季和春季磷的矿化速率都明显高于氮的矿化速率.实验水体的总氮和总磷浓度在腐解过程呈现初期迅速上升、中期迅速下降、后期缓慢下降的趋势.总体来看,芦苇和狭叶香蒲的腐烂分解受季节和初始氮磷浓度的影响较大,芦苇反应较香蒲更敏感且对水质的影响具有时效性.
Aquatic plant restoration has become an important means of water eutrophication remediation, but the problem of produ- cing pollution after the plant decaying has been paid extensive attentions. This study took the Phragmites australis and Typha an- gustifolia as the study objects, which naturally grow and widely distribute in small rivers of agricultural area at the foothills of the Fuhe River Basin, and studied the differences of decomposition and the effects on water nutrient level using the method of simula- tion experiments. The results showed that the residual biomass of the two aquatic plants decreased rapidly at the beginning and then decreased slowly. The decomposition rate of the P. australis and T. angustifolia were 0.0251 and 0.0169 d-1 in spring, respective- ly, which are significantly higher than that in winter （0.0027 and 0.0052 d-1 ）. There was a certain correlation between the decom- position rate and the nitrogen and phosphorus contents and the ratio of the plants. The mineralization rate of phosphorus was signifi- cantly higher than that of nitrogen. The initial content of total nitrogen and total phosphorus in the experimental water rapidly in- creased in the early stage of decomposition processes, then rapidly declined in the middle period and slowly declined in the later stage. Overall, decomposition of the P. australis and T. angustifolia was greatly influenced by seasons and the initial content of ni- trogen and phosphorus. The P. australis was more sensitive, and the effects of its decomposition on water quality had timeliness.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2017年第2期420-429,共10页
Journal of Lake Sciences
基金
国家科技支撑计划"十二五"项目(2012BAJ21B006)资助
关键词
芦苇
狭叶香蒲
腐烂分解
营养盐
矿化速率
水质
Phragmites australis
Typha angustifolia
decomposition
nutrient
mineralisation rate
water quality
