Effects of soil fertility and artificial defoliation on photosynthesis and growth of Solidago canadensis
【摘要】：正Effects of environmental resource availability and defoliation regimes on growth of plants were much different, and some were contrary. The aim of this study is to investigate the effects of different defoliation regimes on the photosynthesis and consequent growth of alien Canadian goldenrod (Solidago canadensis) at two soil fertility levels. The experimental results showed that high level of soil fertility and low intensity (25%) of defoliation effectively increased the fitness of the invasive species in relation to both its photosynthesis and its consequent growth. Change in stomatal conductance can partly explain the effects of defoliation on its net photosynthetic rate. And the damaged plants may be induced to use a greater proportion of the absorbed light energy for photosynthesis as a result of altered carbohydrate source-sink relationships. High density of natural enemy population should be released to effectively control the invader, since high intensity defoliation (100%) significantly depressed growth of the plant.