Effects of integration treatments and competition on photosynthetic performance of the two clonal plants.

<p>The maximum quantum yield of photosystem II (<i>F</i>_v/<i>F</i>_m) and the effective quantum yield of PSII (Yield) of the invasive plant <i>A. philoxeroides</i> (left: A, B) or native plant <i>J. repens</i> (right: C, D) in the apical sections, grown either with or without competitive vegetation (<i>J. repens</i> or <i>A. philoxeroides</i>) in three integration treatments. Data indicate the means ± SE.