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收割强度对粉绿狐尾藻生长和水质的影响
引用本文:俞新慧,吴晓东,葛绪广,桂智凡,周梦蝶,卞玲玲,刘恋.收割强度对粉绿狐尾藻生长和水质的影响[J].水生态学杂志,2022,43(1):95-102.
作者姓名:俞新慧  吴晓东  葛绪广  桂智凡  周梦蝶  卞玲玲  刘恋
作者单位:湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石,湖北师范大学城市与环境学院 湖北 黄石 黄石市土壤污染防治重点实验室 湖北 黄石
基金项目:湖北省教育厅科学技术研究项目(Q20182502,D20152503)和湖北师范大学湖泊流域重金属污染机理与生态修复创新团队项目
摘    要:研究5种收割强度对粉绿狐尾藻生长和水质的影响,为沉水植物调控管理提供参考。设不收割组作为对照组,收割组收割强度分别为株高的15%、30%、45%、60%和75%。将收割的植物称量干重和鲜重,统计株高、分枝数,测定新生枝条的恢复长度。每次收割前1 d对所有处理组的水样进行水质测定。结果表明:(1)收割对粉绿狐尾藻枝条生长恢复和株高影响显著(P<0.01)。对照组最终株高最高,达到187.0 cm,并在水面形成冠层。第1次收割后20 d,低强度(15%和30%)收割组恢复或超过收割前水平,中强度(45%)收割组枝条全部恢复,但高强度(60%和75%)收割组的恢复率明显低于低、中强度收割组,恢复率分别为80.68%和62.00%。第2次收割后20 d,15%和30%收割组的粉绿狐尾藻全部恢复,45%收割组的恢复率为91.44%,高强度收割组的恢复率明显降低,恢复率分别为76.09%和42.22%,至实验结束时高强度收割组都未恢复。随着收割频次的增加,枝条恢复的时间延长。(2)收割减少了粉绿狐尾藻分枝数。对照组分枝数最高,达到6.9枝/株,15%~75%收割组分别为4.3、4.0、3.6、2.2和1.8枝/株。(3)收割显著降低了粉绿狐尾藻的生物量(P<0.01)。15%~75%收割组的生物量分别下降为对照组的10.11%、3.23%、2.47%、2.29%和0.80%。(4)粉绿狐尾藻收割对水质影响显著。收割后,水体中总氮、总磷浓度降低,且收割强度与收割次数对氮磷浓度影响显著(P<0.01)。与第1次收割相比,第2次收割后,15%收割组总氮、总磷浓度分别较前次下降13.63%和24.82%,30%收割组下降12.90%和22.87%,45%收割组下降8.24%和25.04%,高强度(60%和75%)收割组下降6.66%和34.91、9.64%和17.64%。收割强度会对水体中悬浮颗粒物(SS)和叶绿素(Chl-a)有影响,高强度收割使得水体中的SS和Chl-a含量明显升高。收割对控制粉绿狐尾藻生长效果明显,结合水质指标,以低强度收割2~3次为宜。

关 键 词:粉绿狐尾藻  收割强度  生长  水质
收稿时间:2020/4/4 0:00:00
修稿时间:2020/8/2 0:00:00

Effects of Harvest Intensity on Myriophyllum Aquaticum Growth and Water Purification
YU Xin-hui,WU Xiao-dong,GE Xu-guang,GUI Zhi-fan,ZHOU Meng-die,BIAN Ling-ling,LIU Lian.Effects of Harvest Intensity on Myriophyllum Aquaticum Growth and Water Purification[J].Journal of Hydroecology,2022,43(1):95-102.
Authors:YU Xin-hui  WU Xiao-dong  GE Xu-guang  GUI Zhi-fan  ZHOU Meng-die  BIAN Ling-ling  LIU Lian
Institution:College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University,College of Urban and Environmental Sciences,Hubei Normal University
Abstract:In order to provide reference for the management of alien species, different harvest intensity on growth of Myriophyllum aquaticum and water quality were researched through simulation experiments. The results showed that: (1) Harvesting had a significant effect on recovery of shoots and plant height of M. aquaticum. In the control group, the ultimate plant height reached 187.0cm, and a canopy was formed on the water surface. All groups could fully recover in the first harvest. In the second harvest of 75% high intensity,subjects did not recover by the end of the experiment, and with the increase of harvest frequency, the recovery time of branches was prolonged; (2) Harvesting reduced the number of branches of M. aquaticum . The control group had the highest number of branches, which reached 6.9 / plant.The number of branches of 15%-75% harvest groups fell to 4.3, 4.0, 3.6, 2.2 and 1.8 / plant; (3) Harvesting significantly reduced the biomass of M. aquaticum. The biomass of 15%-75% harvest group respectively decreased to 10.11%, 3.23%, 2.47%, 2.29% and 0.80% of the control group; (4) The harvest of M. aquaticum had a significant impact on water quality. To harvest M. aquaticum in medium and low intensity during the growing period could effectively improve water quality. Harvesting has obvious effect oncontrolling the growth of M. aquaticum, and 2~3 times low intensity harvest was appropriate with a reference to water quality.
Keywords:Myriophyllum Aquaticum  Harvest  Growth  Water quality
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