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《Journal of Nanjing University(Natural Sciences)》 2015-05
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The morphological analysis of phytolith in Green Foxtail on Songnen grassland in different warming conditions

Yu Hao;Jie Dongmei;Jiang Hongtao;Wang Haitao;Wang Nan;School of Geographic and Oceanographic Sciences,Nanjing University;School of Geographical Science,Northeast Normal University;Department of Geography and Resource Management,The Chinese University of Hong Kong;Institute of Geography,Chinese Academy of Sciences;  
Open-Top Chamber(OTC)method was applied to simulate different warming conditions for raising green foxtail on Songnen grassland.Some well-grown green foxtail were transplanted into three OTCs with different extents of warming.In order to receive more accurate results,a comparative experiment in natural environment was set next to the OTCs.Phytoliths were extracted from green foxtail by wet cinefaction method.The paper analyses the morphology and percentages of different phytoliths to study their respective change rules in accordance with different temperatures.Four conclusions were come into shape:(1)Phytoliths in green foxtail are classified into five main classes,namely,the bilobate,point-shaped,hat-shaped,elongate,hair-shaped and tracheid,and thirteen subclasses.Of all phytolith types,the bilobate takes the highest percentage of 51.33%,followed by the point-shaped of 34%,while other types take rarely.(2)The percentage of hat-shaped,elongate and hair-shaped phytolith reduces along withgrowing temperature in the simulated greenhouse while that of the bilobate and point-shaped increase.Moreover,hatshaped and hair-shaped phytoliths respond significantly to warming.Hat-shaped phytolith takes less than 5%,but the percentage of change in the amplitude reaches 3%;the percentage of change in hair-shaped phytolith turns out2% while it is only 4.67% of the total.Other types have relatively small changes.(3)The morphology of phytolith in green foxtail tends to wrinkle under the warming treatment.When it comes to the bilobate,the split-degree of the end of the bilobate becomes larger because of the artificial simulated temperature gradient.The percentage in the hatshaped with echinate raised from 50% to 80.12% while hat-shaped with flat reduces from 50% to 19.88%.The morphological changes of elongate phytoliths also reflect the argument above.(4)The warming treatment promotes the growth of bilobate phytolith.The average length of bilobate increases 1.9um and average width increases 0.59 um under the warming conditions.
【Fund】: 环保公益项目(201109067);; 国家自然科学基金(40971116)
【CateGory Index】: Q944
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