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Tertiary Sporo-Pollen Assemblage of-Zhujiangkou Pearl River North Basin and Its Stratigraphicai Significance Impacts of grid sizes on urban heat island pattern analysis Chemical forms and transformations of Pb, Cu and Cd in agricultural soils of Changjiang and Zhujiang deltas Changes of the dike-pond agricultural pattern and water hyacinth invasion in southern China SPATIAL ANALYSIS OF ARTIFICIAL LANDSCAPE TRAN SFORM IN FENGGANG TOWN,DONGGUAN CITY