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• 研究报告 • 上一篇    下一篇

鄱阳湖典型洲滩湿地植物根系生长对极端水情变化的响应

游海林1,2,徐力刚1,姜加虎1,许加星1,2,邓建明1,2,王晓龙1**   

  1. (1中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008; 2中国科学院大学, 北京 100049)
  • 出版日期:2013-12-10 发布日期:2013-12-10

Responses of typical hygrophytes root growth characteristics to extreme water regimes in beach wetland of Poyang Lake, China.

YOU Hai-lin1,2, XU Li-gang1, JIANG Jia-hu1, XU Jia-xing1,2, DENG Jian-ming1,2, WANG Xiao-long1**   

  1. (1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-12-10 Published:2013-12-10

摘要:

选择鄱阳湖典型洲滩湿地植物灰化薹草(Carex cinerascens)、虉草(Phalaris arundinacea)和蓠蒿(Artemisia selengensis)为研究对象,通过盆栽控制试验探讨长期淹水与旱化处理对3种植物根系生长特征的影响。结果表明:1)灰化薹草和虉草在长期淹水条件处理下主根长度、须根长度、主根重量以及须根重量均明显大于旱化处理;蓠蒿根系生长特征则显示了相反的趋势。2)在长期淹水条件下,各植物主根长度及须根长度差异不明显;而在旱化条件下,3种植物主根长度则显著高于须根长度。在长期淹水条件下,3种植物主根重量由大到小依次为灰化薹草>虉草>蓠蒿,而须根重量则为灰化薹草>蓠蒿>虉草;在旱化处理条件下,3种湿地植物主根重量与须根重量差异均较明显。3)在长期淹水条件下,3种植物地下生物量与地上生物量的比值差异显著;而干旱处理条件下各植物的地下生物量与地上生物量的比值差异不明显。此外,无论是在长期淹水还是在旱化处理条件下,3种植物主根长度与其地表长度的比值差异均不明显。4)3种植物的主根长度和须根长度、主根与须根长度之比以及主根重量之间均具有较好的相关性。
 

Abstract:

A pot experiment with long-term flooding and drought was conducted to study the root growth characteristics of three typical hygrophytes (Artemisia selengensis, Carex cinerascens, and Phalaris arundinacea) in beach wetland of Poyang Lake. As for C. cinerascens and P. arundinacea, their main root length and weight as well as fibrous root weight and length under long term flooding were obviously greater than those under drought. However, A. selengensi showed an opposite trend to C. cinerascens and P. arundinacea. No significant differences were observed in the main root and fibrous root lengths among the three typical hygrophytes under long term flooding, but the main root length was greater than fibrous root length under drought. Under longterm flooding, the main root weight of the three hygrophytes was decreased in the order of C. cinerascens > P. arundinacea > A. selengensis, while the fibrous root weight was decreased in the order of C. cinerascens > A. selengensis > P. arundinacea. Under drought, obvious differences were observed in the main root and fibrous root weights among the three hygrophytes. The ratios of the belowground and aboveground biomass of the hygrophytes were significantly different under longterm flooding, but not obvious under drought. Additionally, under both longterm flooding and drought, the ratios of the main root length and plant height were not significantly different among the hygrophytes. There existed good correlations between the main root and fibrous root lengths, ratios of main root length to fibrous root length, and main root weights of the hygrophytes.