摘要
采用盆栽试验,分析了入侵植物三叶鬼针草苗期和果期根际土壤理化性质、微生物群落和土壤酶活性的变化。结果表明:三叶鬼针草苗期根际土壤理化性质与对照差异不显著,果期根际土壤与对照和苗期差异显著,有机质含量增加,全P含量显著降低,全K含量明显下降;与苗期相比,果期根际土壤细菌和真菌的数量显著增加,但放线菌的数量无显著差异;整体来看,三叶鬼针草果期对土壤酶活性的影响大于苗期。与苗期相比,果期根际土壤的脲酶活性、蔗糖酶、酸性磷酸酶活性显著升高,而硝酸还原酶活性显著降低。由此可见,三叶鬼针草通过改变土壤生态系统的微生物组成和土壤酶活性,提高自身对土壤养分的利用能力,以保证其种群顺利繁殖,维持其竞争优势。
Pot experiment was used to analyze rhizosphere soil physicochemical properties,microbial communities and changes of soil enzyme activities of invasive plant Bidens pilosa at seeding and fruiting stages.Results showed that there was no significant difference between B.pilosa at seeding stage and the control in rhizosphere soil physicochemical properties.On the other hand,data was different at fruiting stage：content of organic matters increased,whereas contents of total P and K declined.Compared with seeding stage,the number of rhizosphere bacteria and fungi at fruiting stage ofB.pilosa increased with no different in the number of actinomycetes.Effects on activities of soil enzyme at fruiting stage of B.pilosa were much greater than seeding stage.Activities of rhizosphere urease,invertase and acid phosphatase at fruiting stage increased significantly,and the nitrate reductase activity reduced.Therefore,by changing the microbial component of soil ecosystem and enzyme activities and improving utilization of soil nutrients,B.pilosa can ensure the population reproduction and maintain its competitive advantage.
出处
《西南农业学报》
CSCD
北大核心
2013年第5期1953-1956,共4页
Southwest China Journal of Agricultural Sciences
基金
四川省教育厅面上项目(11ZB077)
四川省教育厅重点项目(132A0143)
四川师范大学大精项目(DJ2013-08)
关键词
三叶鬼针草
入侵植物
土壤性质
土壤微生物
土壤酶活性
Bidens pilosa
Invasive plant
Soil properties
Soil microorganism
Soil enzyme activity
