Font Size: a A A

Effects Of Arbuscular Mycorrhizal Fungi On The Growth Of Plants In Wetland Soils With Different Salt Content

Posted on:2016-09-17Degree:MasterType:Thesis
Country:ChinaCandidate:J Y GuoFull Text:PDF
GTID:2180330482473796Subject:Environmental Science and Engineering
Abstract/Summary:PDF Full Text Request
Wetland is called the kidney of the earth, with a variety of unique ecological functions, is the world’s most valuable and most productive ecosystems, but in recent years wetland area is decreasing due to the problem such as wetland soil salinization. Therefore, take the appropriate measures for wetland protection and restoration is imminent. A greenhouse pot experiment was conducted to investigate the effects of arbuscular mycorrhizal (AM) fungi Claroideoglomus etunicatum (CE), Rhizophagus intraradices (RI), Funneliformis mosseae (FM), Glomus versiforme (GV) and Glomus tortuosum (GT) on AM colonization rate, biomass, mineral nutrient uptake, C:N:P ratios and Na+ and Cl- concentrations of reeds (Phragmites australis) and typha (Typha orientalis Presl) grown in saline and non-saline wetland soils.For the reeds the results indicated that symbiotic associations were successfully established between the four isolates and reeds grown in two types of wetland soils. The average AM colonization rates ranged from 2.5% to 38%. The mean root colonization rate of CE was significantly higher than that of the other three isolates. There were no significant differences in root colonization rates between saline and non-saline wetland soils. The biomass and nutrient contents of reeds grown in non-saline wetland soils were significantly higher than those grown in saline wetland soils. However, Na+ and Cl- concentrations of reeds grown in non-saline wetland soils were significantly lower than those grown in saline wetland soils. In non-saline wetland soils, inoculation with GV significantly increased the shoot dry weight and the shoot N, P, K, Ca and Mg contents of reeds. Inoculation with GV and RI significantly improved the root P and K contents of reeds. Inoculation with the four AM fungi significantly reduced the shoot N:P ratios. Inoculation with FM and GV significantly reduced the root C:N and C:P ratios. Inoculation with the four AM fungi significantly reduced the shoot Cl-concentrations. Inoculation with RI significantly reduced the shoot Na+ concentrations. In saline wetland soils, inoculation with AM fungi had no significant effect on the biomass, mineral nutrient uptake and Na+ and Cl-concentrations of reeds. The results demonstrated that the four AM fungi isolates had different effects on the growth of reeds in wetland soils with different salt contents. Inoculation with AM fungi played a more positive role in improving the growth of reeds in non-saline wetland soil than those in saline wetland soil.For typha, the results show that only the typha which grown in non-saline wetland soils are survival, but all dead in saline wetland. In the non-saline of soil,5 kinds of AMfungi were established a symbiotic relationship with typha, mycorrhizal infectionrate were about 7.5%, and there is no significant difference between each species.Five kinds of inoculation treatment promoted the the growth of typha in non-salinewetland soil, and also promoted the absorption of N, P, K, Ca, Mg, five kinds ofnutrient elements and absorption of Na+ and Cl- content on the ground, reduce theaboveground C:N:P ecological stoichiometric ratio and the content of the Na+ andCl- of roots. The experiments have proved that arbuscular mycorrhizal fungi in the wetlandenvironment with low infection rate, and according to different plants, the infectionrate can be difference. But inoculated with arbuscular mycorrhizal fungi all have acertain role in promoting plant growth, the absorption of nutrient elements in thenon-salinization wetland soil. And also promoting effects in non-salinization arebetter than in salinization wetland soil, suggests that the beneficial effects of AMfungi on plant will be impact by the conditions of salt content. Further experimentsshould be conducted to screen optimal AM fungi isolates under field conditionsand to evaluate the practical effects of AM fungi on the growth of reeds in wetlandsoils with different salt contents.The aim was to provide a technical basis for theecological revegetation and salinity restoration of wetland ecosystem.
Keywords/Search Tags:arbuscular mycorrhizal fungi, Salinization, Wetland soil, reeds, typha
PDF Full Text Request
Related items