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利用植物体内叶绿素荧光测定技术，分析了不同生长环境中沙田柚叶绿素ａ 的荧光参数。结果表明，矿质营养水平较高的果园，树体Ｆｖ／Ｆｍ 和ΦＰＳⅡ较高，表明具有较高的光能转换效率和ＰＳⅡ电子传递效率，尤以Ｆｖ／Ｆｍ 为显著。Ｆｖ／Ｆｍ 与Ｎ、Ｋ、Ｍｎ 含量成极显著正相关，与Ｍｇ、Ｃｕ含量成显著正相关。有果短枝叶片的Ｋ、Ｍｇ、Ｍｎ 含量较无果短枝低，前者的Ｆｖ／Ｆｍ 和ΦＰＳⅡ亦较后者低。退化树和正常树相比，矿质元素含量和荧光参数均没有明显差异。
The fluorescence parameters of chlorophyll a in grapefruit from different growth environments were analyzed by using chlorophyll fluorescence assay. The results showed that the higher Fv / Fm and ΦPSⅡ of the orchards with higher mineral nutrition showed higher photosynthetic efficiency and PSⅡ electron transfer efficiency, especially Fv / Fm. Fv / Fm and N, K, Mn content was extremely significant positive correlation, and Mg, Cu content was significantly positively correlated. Fruiting branches of the leaves K, Mg, Mn content than non-fruiting branches, the former Fv / Fm and ΦPS Ⅱ also lower than the latter. There was no significant difference in the content of mineral elements and fluorescence parameters between the degraded tree and the normal tree.