作 者 ：刘玉芳,陈双林*,李迎春,陈 珊,郭子武,杨清平
期 刊 ：西北植物学报 2015年 2期 页码：350~355
Keywords:Phyllostachys rivalis, waterlogging, nutrient, ecological stoichiometry,
摘 要 ：以长期淹水环境下能生长更新的河竹为材料,调查测定了人工喷灌供水(CK)、淹水6个月(TR)的河竹一年生竹鞭的根生物量和主要养分元素含量,分析长期淹水对河竹鞭根养分化学计量特征的影响,为河竹在水湿地和消落带植被恢复中的应用提供理论依据。结果显示:(1)与CK相比,TR处理下的河竹土中根的N、P、Mg和Ca含量显著降低,Fe含量显著升高,且N、K和Ca含量显著低于TR处理下水中根的含量,而Fe含量显著高于水中根。(2)TR处理的河竹土中根的C/N、C/P、C/K和P/K较CK显著升高,且C/K、N/K和P/K显著高于TR处理的水中根。(3)TR处理的河竹水中根的C-N、C-P、N-P均呈极显著正相关关系,土中根的C-P、C-K、P-K均呈极显著正相关关系;CK河竹土中根的C-P、C-K呈极显著正相关关系,且N-P显著相关;从相关系数看,TR处理下土中根的C-N、N-P和N-K相关性减弱,C-P、C-K和P-K相关性增强,而C-N、C-P、N-P和N-K相关性较水中根减弱,C-K和P-K相关性较水中根增强。(4)TR处理下鞭根生物量和C、N、P、K、Mg、Ca积累量较CK分别显著降低19.46%、42.04%、36.55%、41.39%、60.06%和38.46%,而Fe积累量显著升高,为CK的5.5倍;TR处理下土中根养分积累量显著高于水中根。研究表明,长期淹水虽阻碍了河竹鞭根的养分平衡吸收,但能够提高养分利用效率,并且土中根和水中根具有克隆分工特征,水中根主要起到氧气吸收应对缺氧环境胁迫的功能,是河竹适应长期淹水环境的重要生态对策。
Abstract:The study is to provide reference for the application of Phyllostachys rivalis in vegetation restoration of wetland and hydro-fluctuation belt taking P.rivalis that can survive under long-term flooded conditions as memory materials.Biomass and the contents of main nutrient elements in annual bamboo rhizome roots were investigated in a pot experiment with treatments of artificial irrigation water supply(CK) and flooding six months(TR).The effect of long-term flooded conditions on nutrient stoichiometric characteristics of P.rivalis rhizome roots was analyzed.The results showed that:(1)In TR,N,P,Mg and Ca contents of P.rivalis rhizome roots in soil decreased significantly and Fe content increased dramatically compared to CK.Meanwhile,N,K and Ca contents of rhizome roots in soil were significantly lower and Fe content was significantly higher than that of rhizome roots in water.(2)In TR,C/N,C/P,C/K and P/K ratios of rhizome roots in soil were significantly higher than that of rhizome roots in CK,and C/K,N/K and P/K ratios were also significantly higher than that of rhizome roots in water.(3)There were very significant positive correlations among C,N and P contents of root in water and soil under TR.In CK,C content of root was significantly positive correlated with P,K and the N-P correlation is also significant.In view of correlation coefficient,the correlations of C-N,N-P and N-K of rhizome roots in soil under TR were weakened.Meanwhile,the correlations of C-P,C-K and P-K were enhanced.In TR,C-N,C-P,N-P and N-K correlations of rhizome roots in soil were weaker than that of rhizome roots in water,C-K and P-K correlations were stronger than that of rhizome roots in water.(4)Biomass and C,N,P,K,Mg,Ca contents of rhizome roots in TR were significantly lower 19.46%,42.04%,36.55%,41.39%,60.06% and 38.46% than that of rhizome roots in CK,Fe content dramatically increased 5.5 times compared to CK.And in TR,the nutrient accumulation in soil was significantly higher than that in water.The results indicated that the equilibrium absorption of nutrient was hindered by the long-term flooded stress in rhizome roots of P.rivalis,but the utilization efficiency of nutrient was enhanced.And the rhizome roots in soil and water had the characteristics of division of cloning.Rhizome roots in water mainly played a role in the absorption of oxygen to response to oxygen-deficient environment.It was an important ecological countermeasure of P.rivalis to adapt to long-term flooded environment.