Soil biota, but not soil nutrients, facilitate the invasion of Bidens pilosa relative to a native species Saussurea deltoidea
Article first published online: 13 FEB 2009
© 2009 The Authors. Journal Compilation © 2009 European Weed Research Society
Volume 49, Issue 2, pages 201–206, April 2009
How to Cite
CUI, Q.-G. and HE, W.-M. (2009), Soil biota, but not soil nutrients, facilitate the invasion of Bidens pilosa relative to a native species Saussurea deltoidea. Weed Research, 49: 201–206. doi: 10.1111/j.1365-3180.2008.00679.x
- Issue published online: 9 MAR 2009
- Article first published online: 13 FEB 2009
- Received 22 June 2008 Revised version accepted 22 September 2008
- exotic plant invasion;
- invasive alien species;
- habitat association;
- nutrient availability;
- sterilisation effects
Cui Q-G & He W-M (2009). Soil biota, but not soil nutrients, facilitate the invasion of Bidens pilosa relative to a native species Saussurea deltoidea. Weed Research49, 201–206.
Existing evidence has shown that soil biota and nutrient availability in the introduced ranges are drivers of plant invasions. Bidens pilosa, an invasive species, grows better in rich soil from under shrubs than in poor soil from spaces between the shrubs. Here, we hypothesise that soil biota will benefit B. pilosa more than the native herb Saussurea deltoidea and that B. pilosa will also be favoured over S. deltoidea in nutrient-rich soil compared with soil lower in nutrients. To test both hypotheses, we conducted an experiment in which B. pilosa and S. deltoidea were subjected to non-sterile and sterile soils from both shrubs and gaps. Sterilisation had greater negative effects on the growth of B. pilosa than S. deltoidea indicating that mutualists appear to have stronger effects on the invasive than on the native plant. Although shrub soil was significantly richer in nutrients than gap soil, this difference did not affect biomass production of B. pilosa. In contrast, B. pilosa had greater total biomass in non-sterile shrub soil than in non-sterile gap soil. These findings suggest that successful invasions of B. pilosa are because of the shrub-dependent effect of soil biota in the introduced ranges and that its habitat association appears to be closely linked to soil biota, but not soil nutrients.