基于遥感数据对中国表土花粉进行植被覆盖度定量估算的研究  

SATELLITE MODIS-AND MODERN POLLEN-BASED QUANTITATIVE VEGETATION COVER SIMULATION IN CHINA

作　　者：郑卓[1] 郑艳伟[1] 黄康有[1] 魏金辉[1] 许清海[2] 吕厚远[3] 罗运利[4] 罗传秀[1] Celia Beaudouin 

机构地区：[1]中山大学地球科学系,广州510275 [2]河北师范大学资源与环境科学学院,石家庄050016 [3]中国科学院地质与地球物理研究所,北京100029 [4]中国科学院植物研究所,北京100093

出　　处：《古生物学报》2009年第2期228-239,共12页Acta Palaeontologica Sinica

基　　金：国家自然科学基金项目(40772113、40331011、40730103、40671187)资助

摘　　要：本文主要探讨利用现代类比法将表土花粉数据定量转换为植被覆盖度的方法,以及该方法在中国复杂地貌和气候环境中应用的可行性和可信度。陆地植被覆盖使用了卫星遥感MODIS500×500m分辨率的栅格数据,覆盖度分类为乔木、草地和裸地三种。使用的表土花粉数据共1127个样点,其地理分布基本能够覆盖中国的各种植被类型。用于现代类比法定量计算的花粉变量类型共64个。研究结果表明,计算获得的每个样点的植被覆盖度与MODIS实际观测值具有很好的对应性,基于花粉的覆盖度估算值与遥感实际观测值之间的相关性很高,其中裸地达到0.99,乔木达到0.97,草地为0.95。从空间分布看,利用花粉定量转换的植被覆盖样点可以清楚地识别从裸地向草地和乔木的变化区间,并且与植被分布的实际情况吻合。本研究证明,基于中国表土花粉数据对植被覆盖度的定量恢复是可行的。此外,研究发现乔木覆盖度较高的对应特征花粉较多,主要是松属、栲属、栎属(含青冈栎)、桦属、桤木属、杨梅属、冷杉属、云杉属等,而草地的对应特征花粉类型有莎草科、禾本科、蒿属、蔷薇科、豆科等,裸地主要为麻黄属和藜科等。Based on a set of 1 127 modern surface pollen assemblages from China and NASA MODIS 500m resolution image, this paper presents the preliminary reconstructions of vegetation cover of China using modern analog technique. Trees, herbs and bare land coverage data were extracted from MODIS images. A total of 64 pollen types was selected for estimating the vegetation cover. The modeling result shows that the evaluated vegetation covers based on pollen data were coherent with the observed value of MODIS, and the correlation coefficient is reliable and significant： the bare cover is as high as 0.99, the tree cover is 0.97 and the herbs 0.95. As a result, the vegetation cover can be accurately simulated with MAT technique based on Chinese modern surface pollen dataset. Furthermore, the simulated result shows a concordant spatial distribution in the vegetation cover with Chinese vegetation map. The characteristic pollen types corresponding to the high tree cover samples include mainly. Pinus, Castanopsis, Quercus, Dacrydiurn, Alnus, Betula, Myrica, Podocarpus, Abies, Mallotus, Ericaceae, Ilex, Tsuga, Symplocos, Liquidambar and Platycarya. The typical pollen taxa in the highest herbaceous cover samples are Cyperaceae, Artemisia, Chenopodiaceae, Poaceae, Asteraceae, Rosaceae and Fabaceae. And the bare cover is characterized by Ephedra and Chenopodiaceae.

关 键 词：表土花粉 MODIS数据 植被覆盖度 现代类比法 

分 类 号：Q948[生物学—植物学]