水稻冠层光合有效辐射的分布特征及其与叶面积指数的关系

Distribution Characteristics of PAR in Rice Canopy and Relationship between PAR and LAI

采用冠层分析系统对不同株型水稻冠层的光合有效辐射(PAR)进行了观测,测得入射PAR、冠层反射PAR、透射PAR和水面反射PAR,计算求得冠层反射率、水面反射率、水稻冠层吸收的PAR(APAR)和PAR吸收系数(FAPAR),并研究了它们的变化规律。结果表明,水稻冠层中FAPAR与LAI的相关性达极显著水平,相关方程的估算精度达88.48%,可用于大尺度的全球变化研究中地面数据与卫星遥感数据的链接。

In this research,the PAR （photosynthetically Active Radiation） of rice canopies （incident PAR,reflective PAR of the canopy,the transmitted PAR and the reflective PAR of water surface） of different colonies was observed. On the basis of the observation results,the reflectance of canopy,the reflectance of water surface,the absorbed photosynthetically active radiation （APAR） and the fraction of photosynthetically active Radiation （FAPAR） were calculated and the variation regularities of them were studied. The results showed that,the FAPAR of rice canopy and LAI had extremely strong correlations,with an accuracy of the correlation equation up to 88.48%. This result could be applied to linking the ground data and remote data in large-scale global change research.