入侵植物银胶菊对氮、磷营养的响应

Response of Alien Invasive Weed Parthenium hysterophorus L.to Nitrogen and Phosphorus Nutrition Levels

研究入侵植物银胶菊在不同氮、磷营养水平下的形态、生长和生物量分配。结果表明:1在一定氮水平范围内,根生物量比(RMR)随氮的增加而降低,总生物量、叶生物量比(LMR)、相对生长速率(RGR)、叶面积指数(LAI)、总叶面积(TLA)、叶面积比(LAR)等随氮养分水平的增加而增加,与对照相比,有显著差异。2在磷养分处理下,吸收器官的生物量分配不随磷水平的升高而变化;但LMR、LAR、TLA随磷水平的增加而升高;适量的磷水平使GRG增加;总生物量、LAI等在各磷水平下无明显变化。3银胶菊对氮的可塑性反应高于对磷的可塑性反应。

The morphology,growth and biomass allocation of the invasive weed Parthenium hysterophorus L. under different nitrogen and phosphorus levels were studied. The results showed： （1）In a certain nitrogen range,the root mass ratio （RMR） reduced with increasing nitrogen levels,the total biomass, leaf mass ratio （LMR） relative growth rates （RGR）,leaf area index（LAI）,total leaf area （TLA） and leaf area ratio （LAR） increased with increasing nitrogen levels, which had significantly difference compared with the control group. （2）When adding phosphorus,the biomass allocation to root system did not change significantly with the phosphorus levels changing. LMR, LAR, TLA increased with phosphorus increasing. RGR increased under suitable phosphorus levels. Total biomass, LAI did not significantly change under different phosphorus levels. （3）The phenotypic response of P. hysterophorus to nitrogen was higher than that to phosphorus.