Effects of Soil Nutrient Heterogeneity on Intraspecific Competition in Invasive Plant Aegilops tauschii
Soil heterogeneity is common in natural habitats,and is considered to play an important role in promoting plant invasion success.A pot experiments was therefore conducted to study the response of the invasive plant A.tauschii to the spatial heterogeneity of soil nutrients under different plant densities(1,2,4 and 8 plants/pot)with a constant amount of soil nutrients.The results showed that:(1)Soil nutrient heterogeneity has a positive effect on the growth of A.tauschii in general according to the changes of morphology and biomass indicators,but did not reach a significant level,which may be related to the size of soil patches in the experiment.(2)A.tauschii can adapt to heterogeneous soil environments by increasing root biomass input and reducing root to shoot ratio.(3)Based on the relative competition intensity(RCI)and natural logarithm response ratio(ln RR),there is no interactive effect of nutrient heterogeneity and plant density,and the effect of heterogeneity on intraspecific competition of A.tauschii is small.
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