不同肥料处理对尾巨桉土壤和叶片化学计量的影响

Effect of Fertilizations on Soil and Leaf Stoichiometry of Eucalyptus urophylla×E.grandis

以盆栽尾巨桉DH32-29苗木为试验对象,研究不同肥料处理(包衣肥、硫酸肥、蒸气肥及活性肥)对其土壤和叶片C、N、P含量及其化学计量特征的影响。结果表明:不同肥料处理均能明显提高土壤和叶片的C、N、P含量;添加活性肥的3种肥料处理其土壤C和叶片C、N、P含量均分别大于其未添加活性肥的处理,而添加活性肥的土壤N、P含量均小于未添加的;施肥处理的土壤C∶N、C∶P均显著低于对照;施肥处理的叶片C∶N极显著低于对照,N∶P极显著高于对照,各处理之间的叶片C∶N和N∶P比值相对稳定,且施肥处理的叶片N∶P比值较低;相关分析表明,该试验盆栽土壤中C含量与土壤P含量有较弱的负相关性,而与土壤N及其C、N、P化学计量比、叶片C、N、P及其化学计量比均无相关性,土壤N与土壤C∶N相关性显著,土壤N、P、C∶N、C∶P、N∶P、叶片C、N、P及其化学计量之间均存在极显著的相关性。

Potted seedlings of Eucalyptus urophylla×E.grandis DH32-29 were used to study the effect of the coating,sulfate,steam,or active fertilizations on the soil and the carbon（C）,nitrogen（N）,and phosphorus（P）contents as well as stoichiometric characteristics of the leaves of the plants.The results showed that（1）all fertilization scould significantly increase C,N,and P in the soil and the leaves;（2）C in soil and C,N,and P in leaves were higher by using active fertilization in the soil than those 3other treatments,while N and P in the soil were less with the active fertilization than without;（3）the ratios of C∶N and C∶P in soil were significantly lower with the fertilizations than control without added fertilizer;（4）C∶N in leaves was significantly lower with fertilization than control,and N∶P significantly higher than control,while the ratios of C∶N and N∶P in leaves were similar among the different fertilizations but lower than control;（5）a weak inverse correlationship was oberved between C and P contents in the potting soil;（6）the C,N,and C,N,P stoichiometric ratio in soil did not correlate tothe C,N,P,and stoichiometric ratio in leaves,but in the soil,N significantly correlated with C∶N;（7）highly significant correlations between the N,P,C∶N,C∶P,N∶P in soil and the C,N,P,and stoichiometry in leaves were found.