The growth state of Populus euphratica Oliv. and its leaf ecological characteristics in the lower reaches of Heihe River Research on growth state and physiological changes of Epimedium wushanense under different shade conditions Effects of lead, copper and cadmium stresses on growth andinherent quality of Prunalla vulgaris Effects of Phosphate Starvation on Growth State and Phosphorus Uptake of Tomato Seedlings