But for high sulfur treatment (90 kg S hm-2), the Pn and Chl for all leaves were lower than that of the middle sulfur treatment (60 kg S hm-2).

• 但是，在高硫处理下(90kg/hm~2)，顶部功能叶、旗叶和倒三叶的光合速率和叶绿素含量均有下降的趋势。