Effects of four replacement plants on nutrient and enzymatic activities of soil invaded by Flaveria bidentis
Effect on soil environment is one of important ecological strategies by which invasive plants outperform native species, and selection of appropriate plants might replace the invasive plants or resist their further invasion. In present study, changes in soil fertility and soil enzyme activity were investigated in the cultivation of four replacement plants (Sorghum bicolor x Sorghum sudanense, Helianthus annuus, Medicago sativa and Lolium perenne) mixed with Flaveria bidentis in different growth period. The results showed that compared with F. Bidentis monoculture, (1)NH4+-N, NO3 -N levels of rhizosphere soil in were increased significantly when mixed with M. Sativa, and available phosphorus content was significantly higher when mixed S. Bicolor x S. Sudanense; (2)the urease, phosphatase and invertase activities in M sativa replacement treatment were significantly higher. It can be inferred that both S. Bicolor x S. Sudanense and M. Sativa might have superior capacity in utilization soil of nitrogen compounds than F. Bidentis, and they can competitively inhibit its activation of phosphorus in soil as well in our experiment condition, helping explain their effective replacement control on this invasive species.
Flaveria bidentisSorghum bicolor x Sorghum sudanenseMedicago sativaSoil enzyme activitiesSoil nutrientReplacement contro
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