植被物候观测与指标提取方法研究进展

Review on Vegetation Phenology Observation and Phenological Index Extraction

植被物候直接反映了植被生理生态过程对环境变化的响应,在气候变化研究中受到了越来越多的关注,并形成了不同的物候观测技术和指标提取方法。基于文献调研,首先分类评述了当前常用的植被物候观测技术,其次系统介绍了基于不同类型观测数据的植被物候指标提取方法,最后基于实测数据综合比较了多源数据和多种提取方法获取的植被物候指标之间的差异。分析表明,不同植被物候观测技术具有各自适宜的时间和空间尺度,而各种方法的相互补充将有助于完善植被物候观测体系;同时,利用不同观测技术和提取方法所获取的植被物候指标之间存在明显差异,尤其是对于植被秋季物候指标。因此,合理评估多源数据和多种方法间植被物候的差异,并建立可相互比较与转换的处理方法体系,对于改进和完善植被物候观测具有重要的意义。

Vegetation phenology directly reflects the response of ecosystem physiological and ecological proces- ses to enviromnental changes and has received increasing attention in climate change, which leads to the develop- ment of various phenology monitoring techniques and methods of extracting the phenological index. Based on rele- vant literatures, the monitoring techniques of vegetation phenology were reviewed. Second, the methods of extrac- ting phenologieal index using different techniques were introduced systematically. Thirdly, the differences from multi-source data and from multi-methods were evaluated based on ground phenology record, flux observation and vegetation index. Although various methods have been adopted in current vegetation phenological studies, it should be aware of their appropriately spatiotemporal scales for different methods, and the mutual complementation will help to improve the system for phenology monitoring. Meanwhile, the comparison indicated the obvious differences in derived vegetation phenological index using various observation techniques and extraction methods, especially for the autumn vegetation phenological index. Such results highlight the importance to assess reasonably these differ- ences from multi-source data and from multi-methods, and to establish a rational processing system for the mutual comparison and conversion from different methods.