Silicon can help Indocalamus barbatus plants cope with acid rain stress by maintaining their chlorophyll levels and improving their photosynthetic activity. The study found that applying 100 mg/L of Na2SiO3 was most effective in increasing chlorophyll content by 22.7% and boosting daily net photosynthetic rate by 39.2%. Silicon also helped preserve the plant's photosynthetic system, increasing key fluorescence parameters by up to 146.2%. This suggests that adding the right amount of silicon to these plants can protect them from the harmful effects of acid rain and enhance their ability to photosynthesize under stress.