Effects of the midday temperature increase in summer on photosynthesis and oxidative stress of perennial forage grasses

Table data of the August measurements of prompt chlorophyll fluorescence, antioxidant capacity (FRAP and PM), concentration of polyphenols, levels of MDA and the activity of GOX.本数据集为8月测定的即时叶绿素荧光（prompt chlorophyll fluorescence）、抗氧化能力（FRAP与PM）、多酚浓度、丙二醛（MDA）水平以及乙醇酸氧化酶（GOX）活性的表格数据。