模拟及河道实验浮床水芹根系生长及生物量分配对比研究

发布时间：2018-07-07 07:59

本文选题：水芹浮床 + 生物量分配　；参考：《长江流域资源与环境》2016年S1期

【摘要】：为了对比研究浮床植物水芹菜在模拟及野外河道实验中根系生长及生物量分配的差异性,探索水芹浮床模拟实验与实际应用中的差异性,我们在实验河道边放置水箱,通过抽取河水到水箱中设置水芹浮床水箱模拟实验,并且与河道中水芹浮床实验作对比。结果发现:河道和水箱中植物根系指标除了平均根直径外其他指标随着水芹的生长以指数方式增长,平均根直径随着水芹的生长以指数方式下降;在根系总长度、根系总表面积、根系分叉数、根系交叠数方面,水箱中的水芹显著大于河道中的水芹(p0.05);水箱浮床水芹根系指标的增长速度大于地上部分的增长速度,河道中水芹地上部分增长速度要大于地下部分;水芹冠根比随时间的变化呈现出先下降后上升趋势,水箱中水芹冠根比的变化速率更小。水箱中的水芹受到了营养条件的限制,用模拟水芹浮床来研究其净化效率时,在一定程度上(与实际应用相比)高估了河道水芹浮床根系部分的作用。
[Abstract]:In order to compare the differences of root growth and biomass distribution of floating-bed plant water celery in simulation and field experiments, and to explore the differences between the simulated experiment and practical application, we put water tank beside the experimental channel. The simulated experiment of water celery floating bed water tank was carried out by extracting the river water from the water tank, and compared with the water celery floating bed experiment in the river. The results showed that the indexes of plant root system in river and water tank except the average root diameter increased exponentially with the growth of water celery, and the mean root diameter decreased exponentially with the growth of water celery. In the aspects of total root surface area, root bifurcation number and root overlap number, the water celery in the water tank was significantly larger than the water celery in the river (p0.05), and the growth rate of the root system index in the floating bed in the water tank was higher than that in the aboveground part. The growth rate of the aboveground part of water celery was higher than that of the underground part, the ratio of crown to root of water celery decreased first and then increased with time, and the change rate of the ratio of water celery crown to root in water tank was even smaller. The water celery in the water tank is restricted by the nutrition condition. When the simulated floatation bed is used to study the purification efficiency, the effect of the root system of the river water celery floating bed is overestimated to a certain extent (compared with the practical application).
【作者单位】：华东师范大学河口海岸学国家重点实验;江西省科学院鄱阳湖研究中心;
【基金】：江西省科学院博士引进项目(2013-YYB-6) 华东师范大学河口海岸学国家重点实验室科研业务经费(2010RCDW08)~~
【分类号】：X522;X173

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