PAN Jie-chun;HUANG Xing;DENG Ying-yi;DING Feng;XU Jiong-zhi;XU Shi-lan;HUANG Si-jie;YANG Ya-han;LONG Qiang-yu;WANG Jin-ying;LI Lin;WANG Ying;College of Agriculture, Guangxi University;

Chuliang;;Shixia;;leaf area;;regression equation;;power function

Using mature leaves of two longan cultivars ‘Chuliang' and ‘Shixia' as materials, the correlation between leaf circumference, leaf length, leaf width, leaf length/leaf width, leaf width × leaf width, leaf length × leaf length, leaf length × leaf width and leaf area was analyzed, and nine simulated regression equations were established. The results showed that the leaf area of ‘Chuliang' and ‘Shixia'could be estimated by leaf circumference, leaf length, leaf width, leaf length/leaf width, leaf width × leaf width, leaf length × leaf length, leaf length × leaf width. The regression equation based on leaf length and leaf width had the highest R~2, which meant the fitting effect was the best, and the correlation was the greatest. Therefore, leaf length and leaf width could be used as the preferred index for estimating longan leaf area. Among the nine regression equations based on leaf length × leaf width, the linear, quadratic,cubic and power functions could fit the relationship well, among which the power function had the highest accuracy and was more suitable for estimating the leaf area of longan. The most accurate power function equations of leaf area corresponding to ‘Chuliang' and ‘Shixia' were y=0.751 x~(1.006) and y=0.986 x~(0.973). The most suitable power function of total leaf area for two longan varieties was y=0.869 x~(0.988).