不同营养元素对缺水条件下油松保护酶活性及电导率的影响

通过分析营养元素对油松抗旱能力的影响规律，以期为科学施肥提供理论依据。试验设置S1（常规对照）、S2（清水对照）、S3（N）、S4（NK）、S5（NPK）5个处理，3次重复。SOD活性S5在5、6、7、8月分别比S1处理提高了68.66%、64.54%、36.02%、30.03%，差异显著；POD活性S5分别高于S1处理79.96%、117.82%、51.65%、41.28%，差异显著；CAT活性S5在6、8月分别比S1提高了35.86%、33.51%，差异显著；PPO活性S5分别比S1提高92.18%、125.15%、74.95%、57.77%，差异显著；S5处理电导率始终处于最低值，分别比对照（S1）降低40.46%、24.73%、25.99%、55.55%，差异显著。S5对提高水分胁迫下油松幼苗保护酶活性和降低电导率效果最佳。

Effects of Nutrient Elements on Activity of Protective Enzymes and Electrical Conductivity of Pinus tabulaeformis Under Water Deficiency

Objective] The study in order to provide a theoretical basis for scientific fertilization which by means of analyzes effects of nutrient elements on drought resistance of Pinus tabulaeformis. Methods] the test set 5 treatment as S1 (routine control), S2 (clean water control), S3 (N), S4 (NK), S5 (NPK) and repeat 3 times. results] The S5 treatment SOD activity that was higher than S1 treatment 68.66%,64.54%,36.02%,30.03% when in May, June, July and August and then had significant difference; POD activity that S5 was higher than S1 treatment as 79.96%,117.82%,51.65%,41.28% and then had significant difference; CAT activity S5 was higher than S1 treatment as 35.86%,33.51% when in June and August and then had significant difference; PPO activity S5 was higher than S1 treatment as 92.18%,125.15%,74.95%,57.77% and then had significant difference; The conductivity of S5 was always at lowest level, at the same times, it was lower than control(S1)treatment 40.46%,24.73%,25.99%,55.55% and then had significant difference; Conclusion] S5 was the best treatment as to enhance the activity of protective enzymes and decrease the conductivity of Pinus tabulaeformis seedlings under water stress.