不同生育期水稻叶面积指数与产量的关系

Relationships between rice leaf area index and yield at different growth stages

为了研究叶面积指数（Leaf area index,LAI）与产量的关系,以水稻合美占、粤晶丝苗2号品种为试验材料,采取比叶质量法对叶面积指数进行了测定,并对水稻不同生育期LAI与产量及其产量因素的关系进行了研究.结果表明：不同生育期LAI与产量、单位面积穗数和每穗粒数呈正相关,与千粒质量和结实率呈负相关,决定系数平均达0.4-0.9以上,且粤晶丝苗2号决定系数整体高于合美占;提高不同生育期LAI,不能同步提高产量4因素.

In order to study the relationships between rice leaf area index （LAI） and yield at different growth stages of two rice cultivars, Hemeizhan （HMZ） and Yuejingsimiao2 （ YJSM2）, LAI was meas- ured by using the specific leaf mass method. The results showed that there were significant positive corre-lations between LAI and yield, and total panicle number per unit area and grain number per spike were positively correlated with the LAI, but negative correlations were observed between LAI and the 1 000 - grain weight, and seed setting rate at different growth stages. The whole determination coefficients of both eultivars reached over 0. 4 - 0.9. But the determination coefficient of YJSM 2 was higher than that of HMZ. Retaining high level LAI could not simultaneously increase four yield components at different growth stages.