With the aid of the geographic information system (GIS) software ARC/INFO and remote sensing (RS) digital image-processing software ERMapper, using multitemporal National Oceanic and Atmospheric Administration (NOAA)-advanced very high resolution radiometer (AVHRR) mormalized difference vegetation index (NDVI) data and the ground meteorological data, and on the basis of the estimated photosynthetically active radiation ( PAR ) and net primary production ( NPP ), we estimated the solar energy use efficiency ( e ) in Guangdong, China, which lies mainly in subtropical and tropical monsoon climate zone. The results were: (1) the assessed values of e were consistent with the values measured before in the same regions, so the above method for the estimation of e is effectual and reliable; (2) the annual average of e for Guangdong varied between 0-2.96%, and for the whole region was (1.43±0.53)%; (3) the zonal variations of e in Guangdong were very obvious, so the spatial distribution of e values indicated the feature of ‘uneven’ vegetation in Guangdong, together with the distribution of NPP and other indexes; and the seasonal variations of e in Guangdong were very remarkable too. The mean of e in summer (Apr. to Oct.) was 2.9 times as high as that in winter (Nov. to next Mar.); this difference depended on the features of solar radiation and the vegetation, and, the seasonal variations could be attributed to those in temperature and precipitation; (4) even in the evergreen broad-leaved forests, the values of e for different subtypes were not the same and with large seasonal changes.
基于NOAA-AVHRR NDVI和GIS的广东植被光能利用率及其时空格局
郭志华1 彭少麟2,3* 王伯荪2
（1. 中国林业科学院森林生态环境与保护研究所，北京100091；2. 中山大学生物系，广州510275；
3. 中国科学院华南植物研究所，广州510650）
关键词： 光能利用率；时空格局；多时相NOAA-AVHRR NDVI；地理信息系统；广东省
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