Nutrient allocation patterns in different aboveground organs at different reproductive stages of four introduced <i>Calligonum</i> species in a common garden in northwestern China.

According to the growth rate hypothesis ( Harris, 2003 ; Niklas and Cobb, 2005 ), as the relative growth rate increased, N:P showed a decreasing trend and P showed an increasing trend, which indicated that the growth rate of the Calligonum species was generally the highest in the three reproductive phases.

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In terms of ABs at different reproductive stages, except for the ABs of CK, which showed a trend of increasing first and then decreasing, the other three species showed significantly lower N:P in the flowering phase (an average of 8.112) and as the reproductive process progressed, there was a significant increase in the N:P ratio by the ripe-fruit phase, with the ABs of these three species averaging an N:P of 13.056.

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The P:K ratio in the ABs, except for CC which showed a decrease followed by an increase, exhibited a decreasing trend as reproduction progressed.

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