水稻的叶面积指数 (LAI)是水稻生长的一项重要参数 ,与水稻的生物量与产量直接相关。利用 1999年在江苏省江宁县实测的水稻叶面积指数与同期Vegetation/SPOT的植被指数作了对比分析 ,结果发现同期的LAI与植被指数表现相近的变化特征 ,两者具有良好的相关关系。

Leaf area index(LAI) is an important bio-physical parameter of paddy rice. The LAI will provide important information of the growth of paddy rice. In an effort to develop the quantitative relationships between field measured leaf area index and Vegetation-derived vegetation indices for paddy rice fields,we have measured the leaf area index of paddy rice at 10-day intervals at five sampling sites in Jiangning county, Jiangsu province during the rice growing season (July to October) of 1999, using a LI-COR LAI-2000 plant canopy analyser. After being transplanted in mid to late June, paddy rice LAI increased quickly and reached its plateau by early to mid August. Compared with the VGT sensor derived Normalized Difference Vegetation Index (NDVI), we found that there were similar dynamics of LAI and Vegetation Index over the growing season of paddy rice in 1999.