茎用莴苣不同生长阶段的叶面积估算方法

Estimation of leaf area of stem lettuce at different growth stages

利用快速、精确的方法 ,建立了不同类型的茎用莴苣品种 (长叶型和卵圆叶型 )的叶面积与其叶长、叶宽、以及叶长×叶宽之间的直线回归关系。结果表明叶面积与叶长×叶宽之间有很大的相关性。长叶品种的直线回归方程为 LA=-0 .0 1 82± 0 .6766L× W(R2 =0 .993 4) ,卵圆叶品种的直线回归方程为 LA=-7.472 2± 0 .70 75 L× W(R2 =0 .9868)。用回归方程进行叶面积估算 ,最理想的方法是不同时期采用不同的回归方程式。本研究还表明 ,在叶面积的估算中必须考虑叶片的生长时期和特殊叶型的品种。因此 。

Rapid and precise methods were used to establish relationships between leaf area and leaf length, leaf width, or product of leaf length and leaf width for two distinct cultivars (long leaf type and oval leaf type)of stem lettuce(Lactuca sativa var. angustana).The results showed that leaf area (LA) and product of leaf length and leaf width (L×W) were highly correlated: LA=-0 0182±0 6766 L×W (R 2=0 9934) for long leaf cultivar. And LA=-7 4722±0 7075L×W (R 2=0 9868) for oval leaf cultivar. Estimation of LA based on leaf measurements was shown to be suitable .The study has also revealed that stage of leaf growth and cultivar with distinct leaf shape should be considered in generation of LA prediction models. It is concluded that using suitable regression model is reliable.for leaf area estimation.