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毛竹幼苗生长的NH4+效应研究

Specific response of Phyllostachys edulis seedling to NH4+

  • 摘要: 以毛竹实生幼苗为材料,在室内控制盆栽条件下,设置等氮浓度的不同含氮化合物,并以等物质的量浓度的K2 SO4、NaCl、NaNO3及KNO3和CK进行试验,分析不同处理对毛竹幼苗生长指标和栽培基质pH的影响。结果表明:毛竹幼苗地上部分各生长指标、叶绿素相对含量、根系构型各指标、地上地下部分及总生物量,都是在含NH4+化合物处理条件下要显著优于其他化合物处理,但在不同含NH4+化合物处理之间,各生长指标差异不显著;经含NH4+化合物处理的毛竹幼苗根冠比显著低于CK及NaCl处理;经含NH4+化合物处理后的毛竹幼苗栽培基质pH值,显著低于CK及其他化合物处理。含NH4+化合物中的NH4+对毛竹幼苗生长有显著促进作用,其促进效应可能与改变栽培介质pH值有关。因此,毛竹幼苗育苗栽培过程中应施以硫酸铵或氯化铵为主的铵态氮肥。

     

    Abstract: Phyllostachys edulis seedlings were used as experimental materials, under indoor controlled pot conditions, NH4+ nitrogen compounds of(NH4)2SO4, NH4Cl and NH4NO3 with equal nitrogen concentration(8mM) were set up, and K2SO4, NaCl , NaNO3, KNO3 and blank treatment(CK) were used as controls, to study the effects of different treatments on P. edulis seedling growth index and cultivation matrix pH. The results showwd that: 1) Growth indexes(seedling height, leaf number, tillering), relative chlorophyll content(SPAD value), root configuration indexes(root length, root surface area, root volume, mean root diameter and root tip number), above-ground, below-ground and total biomass of P. edulis seedlings treated with NH4+ compounds((NH4)2SO4, NH4Cl, NH4NO3) were significantly better than that treated with other compounds(K2SO4, NaCl, NaNO3 and KNO3)(P < 0.05), but there were no significant differences between the NH4+ compounds treated seedlings; 2) The root shoot ratios of bamboo seedlings treated with NH4+ compounds were significantly lower than that of CK and the NaCl treated seedlings; 3) Culture substrate pH values under NH4+ compound teratments were significantly lower than that of CK and the other compound treatments. Therefore, the present results showed that the NH4+ ion within NH4+ compounds had significant promotion effects on the growth of P. edulis seedlings, and its promotion effect might be related to the reduced culture substrate pH value. Therefore, ammonium nitrogen fertilizer sucha as ammonium sulfate or ammonium chloride should be better applied in the cultivation process of P. edulis seedlings.

     

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