| As a relatively stable carbon sink,PhytOC plays an important role in the biogeochemical carbon cycle.This work studied the accumulation of carbon,nitrogen and phosphorus in phytoliths in the forest soil from Great Kingan and discussed the different mechamism of forest types on their contents.Additionally,the difference of carbon content and reserves of phytoliths were discussed between cold temperate zone and tropical,subtropical zones.This work helps to accumulate basic data sets for understanding the elemental storage effects of phytoliths in forest ecosystems,especially carbon sequestration mechanisms.1.The morphological results showed that the phytoliths in the studied forest soils were dominated by rods shapes.2.The phytolith content and the contents of carbon,nitrogen and phosphorus in phytolith in the three selected forest types showed a decreasing trend with soil depth,while the PhytOC/TOC increased,indicating that migration and dissolution draw of phytolith profiles patterns.3.The phytolith content in the surface soil from birch forest was the highest,indicating that the decomposition rate of the plant had a direct effect on the phytolith content.4.There were differences in the levels of carbon,nitrogen and phosphorus in the phytoliths of the three forest types in the cold temperate zone,reflecting the different effects of forest types on carbon,nitrogen and phosphorus contents in phytoliths.The N/P ratio was relatively low,revealing the possibility of N-restriction of forest growth in the studied area,and5.Comparatively,it showed that the phytolith content in the subtropical forest soil was the highest due to the reversion flux and biogeochemical stability of the phytolith in different temperature zones;However,phytolith carbon contents showed a sequence of cold temperate greater than subtropical and tropical forests,revealing the importance of phytoliths in cold-temperate forest soils in the study of carbon sequestration and global missing carbon sink. |
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