Variations in Lead Accumulation and Tolerance in Different Varieties of Salix integra and in Situ Distribution of Elements in Leaves under Pb Stress Application of Synchrotron Radiation Technology XAFS on the Research of Element In situ investigation to three dimensional structures of Chinese medicines seeds Distribution Characteristics of Arsenic in Medicinal Plants Panax notoginseng′s Taproots Tissue and Subcellular Components Effect of revegetation on functional groups of soil organic carbon on the Loess Plateau Study on 3 Species of Marine Algae about the Changes of Elements by SR-XRF in Qingdao of China