Effects of external support on the foraging behavior and reproductive strategies in Gynostemma pentaphylum populations Influence of Fertilization on the Clonal Growth of Bamboo Shoots in Phyllostacachys pubescens Foraging Growth Patterns and Resource Allocations of Clonal Leymus chinensis Population in the Sungnen Steppe Morphological responses to different nutrient supply in the stoloniferous herb Glechoma longituba