摘要
在玻璃温室大棚内,模拟太湖的水、土、植物情况,研究了苦草在衰亡腐解过程中营养盐的释放规律以及对水体水质的影响,并初步探讨了其影响机理.在初始生物量为689 g/m2的条件下,苦草衰亡与腐烂分解对水体水质的影响呈2个阶段.第1阶段为10月—翌年2月寒冷的秋、冬季节,表现为降解释放过程,但这一过程向水体及底泥中释放的碳、氮、磷较少,大部分碳、氮、磷仍保留在苦草残体中,水体pH及ρ(DO)也没有明显的变化.第2阶段为3—4月天气回暖后,苦草残体的腐解速率急剧加快,向水体及底泥释放大量营养盐;3月水体TOC、TN、TP总量较2月分别增长了216.64%、60.96%、144.40%,底泥中TOC、TN、TP总量分别增长了31.20%、9.41%、19.99%;pH增长了6.27%,ρ(DO)降低了91.5%.沉水植物腐解过程中各营养盐的赋存形态不断发生转化,并在水-底泥-植物三者间进行迁移.
The nutrient release from submerged maerophytes （ Vallisneria spiralis） during the decomposition process and its effects on water quality were studied in this study. The situation of water, sediment and plants in Taihu Lake Taihus was simulated and the mechanism was revealed by planting the macrophytes in the greenhouse. Under the experimental condition with the biomass of 689 g/m2 , the decomposition of V. spiralis was conducted at two stages. The first stage was from October to next February （ autumn and winter） with low temperature, V. spiralis decayed day by day. During this stage, not much nutrients were released to the water and the sediment and most of the nutrients were kept in the remains of the plant. Meanwhile, pH and the dissolved oxygen concentration had no change. The second stage was from March to April when the weather was warm, the decaying of plants became faster and a lot of nutrients were released to water and sediments, and most of them came into sediments. From February to March, concentrations of TOC, TN and TP increased by 216.64%, 60. 96% and 144. 40%, respectively; pH increased 6.27%, dissolved oxygen concentration dropped by 91.5%. The different nutrients transformed and they were transferred among water-sediment-plant when the submerged macrophvtes decayed.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2013年第2期145-151,共7页
Research of Environmental Sciences
基金
国家自然科学基金项目(40971277)
国家水体污染控制与治理科技重大专项(2012ZX07101-009)
关键词
沉水植物
苦草
腐解
营养盐释放
submerged macrophytes
Vallisneria spiralis
decomposition
nutrient release
作者简介
张来甲（1987-），男，山东泰安人，zhanglaijia@163．com．
叶春（1970-），男，江西九江人，研究员，博士，主要从事湖泊富营养化治理和生态恢复理论与技术研究，yechbj@163．com
