The Effects of Invasion Plant Parthenium hysterophorus on Soil Enzyme Activity and Microbial Nutrient Limitation
To explore the effects and mechanisms of plant invasion on soil enzyme activity and microbial nutrient limitations,this study focused on the invasive plant Parthenium hysterophorus in the Wu Dongde Reservoir area along the Jinsha River,using the native plant Cynodon dactylon as a control.The study analyzed the differences in soil physicochemical properties,extracellular enzyme activities,and microbial nutrient limitations in the rhizo-sphere and non-rhizosphere soils of both plants.The results showed that the rhizosphere soil of P.hysteropho-rus exhibited significantly higher alkaline phosphatase and β-1,4-glucosidase activities,as well as higher avail-able phosphorus content compared to C.dactylon,while β-1,4-N-acetylglucosaminidase activity showed the opposite trend.Additionally,the vector angle and length in both the rhizosphere and non-rhizosphere soils of P.hysterophorus were significantly higher than those of C.dactylon,indicating that soil microbes in P.hysteropho-rus were more severely limited by both carbon and phosphorus.In summary,the invasion of P.hysterophorus significantly enhanced the hydrolytic enzyme activities related to carbon and phosphorus in the rhizosphere soil and exacerbated the carbon and phosphorus limitations of soil microbes in both the rhizosphere and non-rhizo-sphere soils.
Invasion plantEnzyme stoichiometric ratioRhizosphereNutrient cycleJinsha River
万方数据
维普
