Accumulation characteristic of heavy metals and other elements in sediments of Erdaofang River The Element Contents of Platycladus orientalis plantation in Beijing Nutrient Accumulation and Distribution in Fokienia hodginsii and Cunninghamia lanceolata Plantations Cu and nutrient deficiency on different effects of growth, tolerance and mineral elements accumulation between two Elsholtzia haichouensis populations Accumulation and Biological Cycle of K and Na Elements in Bruguiera sexangula Community