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Recent advances in the study of Mesozoic-Cenozoic petrified wood from Thailand

Progress in Natural Science:Materials International 2006年第5期16卷 501-506页

作者： Pratueng JINTASAKUL Paul J.GROTE Nareerat BOONCHAI Northeastern Research Center and Museum for Petrified Wood and Mineral Resources Nakhon Ratchasima 30000 Thailand Geography ProgramNakhon Ratchasima Rajabhat UniversitySuranarai RoadMuang DistrictNakhon Ratchasima 30000Thailand School of Biology Institute of Science Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Northeastern Research Center and Museum for Petrified Wood and Mineral Resources Nakhon Ratchasima 30000 Thailand School of BiologyInstitute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand

Mesozoic to Cenozoic petrified woods are very rich and well preserved in the Khorat Plateau, Northeast Thailand, serving as remarkable material for investigations of tropical vegetation history, paleoclimatic evolution, and paleoenvironmental changes. Our recent field survey and investigations have defined about 50 species of fossil wood assigned to 19 genera and 11 families from Mesozoic to Cenozoic deposits in this region. These woods are ascribed to two groups, gymnosperms and angiosperms. Among them, about 20 species assigned to 7 genera and 5 families are the first reports of the taxa in Thailand. The fossil wood floras indicate that during the late Mesozoic period, the tropical conifer vegetation in Northeast Thailand was dominated by the family Araucariaceae. From the Miocene to Pleistocene, a tropical climate prevailed in this region with perhaps both deciduous and evergreen broadleaf forests comprising the vegetation.

关键词： fossil wood tropical vegetation Mesozoic Cenozoic Thailand.

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REGIONAL GEOCHEMISTRY OF RUBBER PLANTATION IN HAINAN ISLAND,CHINA

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Journal of Geographical Sciences 1990年第2期3卷 79-87页

作者： Wang Jinghua Institute of Geography CAS

Hainan Island is located in the northern periphery of the tropical *** environment is suitable for a number of tropical economic *** content of soil organic matter under rubber plantation is around 10- 20 g ***,Zn,Mn,As,Mg,Ca and K in the soil profile reflect the parent material and the intensive weathering and leaching in the *** has noticeably accumulated in the lower horizon,whereas the concentrations of Ca,Mg and *** rubber trees are 0.5- 4.9,2.2- 4.3 and 4.6-10.2 g *** three elements are mostly distributed in the plant roots and are particularly required during the development of new leaves early in the season.

关键词： rubber plantation nutrient element tropical soil tropical vegetation

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