水土保持植物类芦对氮磷钾养分水平的响应

Effects of nitrogen,phosphorus and potassium levels on the growth of Neyraudia reynaudiana of soil and water conservation plant

【目的】探索不同氮磷钾水平对类芦Neyraudia reynaudiana生长状况的影响.【方法】采用营养液砂培试验,对优良水土保持植物类芦在不同氮、磷和钾供应水平下的响应规律进行了研究.【结果和结论】0.750 mmol·L-1的氮和0.030 mmol·L-1的钾会显著影响类芦生长,降低类芦地上部和地下部生物量;低磷(0.005 mmol·L-1)对类芦地上部生物量无显著影响,但会显著降低地下部生物量;低磷和低钾(0.030 mmol·L-1)对类芦生长的影响显著小于0.750 mmol·L-1氮水平的影响,在低磷和低钾条件下,类芦根系长度和根表面积显著增加,表现出对低磷和低钾胁迫较强的适应和自我调节能力.用类芦进行植被恢复时,氮素的补充更为重要.

【Objective】To explore the effects of nitrogen,phosphorus and potassium levels on the growth of burmareed,Neyraudia reynaudiana.【Method】Nutrient solution-sand culture experiment was applied to study the response of burmareed which was a very excellent soil and water conservation plant at different nitrogen,phosphorus and potassium levels. 【Result and conclusion】The results indicated that 0. 750mmol·L^-1N and 0. 030 mmol · L^-1K significantly affected the burmareed growth and reduced the aboveground and underground biomass of burmareed. The concentration of 0. 005 mmol·L^-1P did not affect the aboveground biomass,but significantly reduced the underground biomass. The effect of 0. 750mmol·L^-1N on the growth of burmareed was significantly stronger than that of 0. 030 mmol·L^-1P and0. 030 mmol·L^-1K. In low P and K condition,burmareed could increase root length and surface area,which displayed its strong capacity of adapting and self-adjusting for low P and K stress. Supplement of nitrogen is very important for revegetation with burmareed.