采用盆栽控制试验 ,研究了单作和混作栽培方式及不同施肥处理条件下 ,水分胁迫对金沙江干热河谷典型土壤 (燥红土和变性土 )玉米 (ZeamaysL .)叶片过氧化物酶 (POD)活性的影响。结果表明 :①在一定的水分胁迫范围内 ,玉米叶片的过氧化物酶活性随着土壤含水量的降低而升高 ,但过度胁迫时 ,酶活性降低 ;②随着土壤含水量降低 ,燥土和变性土上生长的玉米叶片的酶活性的变化规律略有差异 ,这与二者的土壤物理性质有关 ;③施肥处理 [T (N 10 0mg+P2 O5170mg +K2 O 6 0mg/kg干土 ) ;Z (NPK +Zn10mg/kg干土 ) ;M (5 2 g干牛粪 /kg干土+NPK) ]和栽培方式对玉米叶片的酶活性有影响

Using the controlled pot experiment , the effects of water stress on peroxidase (POD) activity of maize leaves in typical soil (dry2red soil and vertisol) in Jinshajiang dry-hot valley were investigated. The results showed that: (ⅰ) in a specific range of waterstress , peroxidase activity in cornleaves increased with the decline of soil water content , however , enzymatic activity decreased when the water stress was overwhelmed; (ⅱ) there was variation of enzymatic activity of corn leaves grown in dry-red soil and vertisol accompanied by declining soil moisture content , which were related to the soil physical properties ; (ⅲ) fertilization treatment [T (N100 mg + P2O5170 mg + K2O 60 mg/ kg dry soil); Z (NPK+ Zn10 mg/ kg dry soil) ; M (512 g dry cow dung/ kg soil + NPK) ] and cultivated pattern affected the enzymatic activity of corn leaves.