Responses of typical hygrophytes root growth characteristics to extreme water regimes in beach wetland of Poyang Lake,China.
Responses of typical hygrophytes root growth characteristics to extreme water regimes in beach wetland of Poyang Lake,China.
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作者：
You Hai-lin
采用盆栽试验，研究了鄱阳湖海滩湿地3种典型湿生植物（藜蒿、灰苔草和苇状草）在长期淹水和干旱条件下的根系生长特征。C.结果表明，长期淹水条件下，灰茅和高羊茅的主根长、主根重、须根重、须根长均明显大于干旱条件下的主根长、须根重。然而，A. selengensi与C. cinerascens和P. arundinacea。3种典型湿生植物在长期淹水条件下主根和须根长度差异不显著，但在干旱条件下主根长度大于须根长度。在长期淹水条件下，3种湿生植物的主根重均呈下降趋势，其下降幅度依次为：C。高羊茅而须根重则按C.灰壳藻A.斑茅干旱条件下，3种湿生植物的主根和须根重量存在明显差异。在长期淹水条件下，湿生植物地下生物量与地上生物量的比值差异显著，而在干旱条件下差异不明显。另外，在长期淹水和干旱条件下，不同湿生植物的主根长和株高的比值差异不显著。湿生植物的主根长、须根长、主根长/须根长比值和主根重之间存在较好的相关性。
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 longterm 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.