【摘要】 采用盆栽方法,就外源菌种、土著菌种(含混合菌种)对固沙植物白草(Pennisetum flaccidum)生长和吸磷效率的影响进行了研究。结果表明,白草具有较高的菌根依赖性(平均达166.4%);不同AM真菌(或真菌组合)对白草根系均具显著的侵染效应。随菌根侵染率的提高,植株生物量、吸磷量均呈显著增加(相关系数分别为0.7465*、0.6000*);菌根菌丝对白草吸收土壤磷素的贡献十分明显,各接种处理菌根菌丝对植物吸收土壤磷素的贡献量、贡献率分别在3.2~11.6 mg/pot和61.5%~85.3%之间;接种菌根处理植株吸磷量呈Glomus intraradices>G.mosseae+G.etunicatum+G.intraradices+Scutellospora erythropa>G.mosseae(外源菌种)>G.mosseae+G.intraradices+Scutellospora calospora>G.mosseae-I(土著菌种)>G.etunicatum的趋势。此外,不同AM真菌对寄主植物地上部、根部生物量和吸磷量的影响程度明显不同,一般呈地上部>根系的趋势,但寄主植物根系的生长速率相对较快;土著菌种中,多菌混合接种对寄主植物的侵染效应明显高于单一接种。更多还原

【Abstract】 A greenhouse study was conducted to learn the effect of introduced or indigenous mycorrhizae species on the growth and phosphorus uptake of Pennisetum flaccidum,which was a sand fixation plant on the grassland of the Tibetan plateau.The result showed that the mycorrhizal dependency of Pennisetum flaccidum was very high(166.4% at the(average) level) and all the AM epiphytes(or epiphyte combination) had a significant infestation effect on the radication of Pennisetum flaccidum.The plant biomass and phosphorus uptake was greatly increased by inoculation of arbuscular fungi(correlation coefficients were 0.7465 and 0.6000 respectively).The hyphae contribution to the plant phosphorus uptake was significant with the contribution amount and rate being 3.2～11.6 mg/pot and 61.5%～85.3% respectively.The phosphorus uptake varied among the different inoculation treatments which appeared as Glomus intraradices>G.mosseae + G.etunicatum + G.intraradices + Scutellospora erythropa>G.mosseae-1(introduced mycorrhizae species)>G.mosseae + G.intraradices + Scutellospora calospora>G.mosseae2(indigenous mycorrhizae species)>G.etunicatum In addition,the influence degree of AM epiphytes on shoot,root biomass and P uptake rate was significant different.The inoculation effect of treatments with mixture of several indigenous fungi was much higher than the single indigenous fungi inoculation treatment.更多还原