When the absolute moisture content in soil dropped to 6.7%,the activity of CAT first reached the maximum.

• 结果表明；随干旱程度加重；扁桃抗氧化酶活性逐渐增强；当土壤绝对含水量降至6.；7%25时；过氧化氢酶(CAT)活性首先达高峰;