魔芋种植对土壤微生物的影响

目的]研究种植魔芋后土壤微生物碳源和氮源以及微生物量和微生物群落结构的变化。方法]以种植魔芋地的土壤作为调查研究对象,用种植玉米的土壤作为对照,测定土壤有机碳、土壤活性有机质、土壤全氮、土壤微生物量和土壤微生物群落结构,分析土壤碳氮、土壤微生物碳氮和土壤微生物细菌和真菌的变化。结果]结果表明,与玉米地相比,虽然种植魔芋后土壤碳氮含量较小,微生物碳含量也较小,但是微生物氮、微生物碳/有机碳的比值和微生物氮/全氮的比值较大;细菌的数量较大,但是真菌的数量和真菌/细菌的比值较小,结果土壤总微生物量FAME也较小。结论]种植魔芋后土壤微生物碳源和氮源数量减少,造成微生物总数量下降。

Effect of Konjac on Soil Microbial Community Composition

Objective] The purpose was to study the change of edaphon carbon source and nitrogen source as well as microorganism quantity and microbial community structure after planting the konjac. Method] With the soil planted the konjac as the investigation and study object and planted corn as CK, the soil organic carbon, soil active organic matter, soil entire nitrogen, edaphon quantity and edaphon community structure was determined. The change of soil carbon nitrogen, edaphon carbon nitrogen and edaphon bacterium and fungus was analyzed. Result]The results indicated that compared with maize, although soil carbon, nitrogen and microbial biomass carbon (MBC) was lower, microbial biomass nitrogen (MBN), MBC/organic carbon and MBN/total nitrogen was higher.Bacterial FAME was higher, whereas fungal FAME and fungal FAME/bacterial FAME was lower, therefore, total FAME was lower. Conclusion] The reduce of edaphon carbon source and nitrogen source after planting konjac would lead to decrease of number of total microbial community.