Record ID No. |
816 |
Author(s) |
Cai XiaoBu, Feng Gu, Qian Cheng, Gai JingPing , 2007 |
Affiliation |
College of Agricultural and Animal Husbandry, Tibet University, Linzhi, Tibet 860000, China |
Title |
Effects of AM fungi on steppe plants and soil environment in Tibet plateau |
Source. Vol.(no):Page |
Acta Pedologica Sinica. 44(1): 63-72 |
Categories |
Arbuscular Mycorrhiza |
Subjects |
General |
Host |
Festuca rubra and Agrostis hugoniana |
Organism |
Glomus etunicatum, Glomus intraradices and Glomus mosseae |
Country |
China, Asia |
Abstracts |
An experiment was carried out in a greenhouse using a three-compartment rhizobox system to study the effects of inoculation of arbuscular mycorrhizal fungi Glomus etunicatum, Glomus intraradices and Glomus mosseae on Festuca rubra and Agrostis hugoniana, and soil environment. Results indicate that inoculation had significant effects on AM fungi infection of the plants and plant growth, increasing dry matter and P contents of both ground parts and roots and phosphorus absorption rate of the plants, improving microbial flora in the rhizaphere and water stability of soil aggregates. The mycorrhizal effects were better on Agrostis hugoniana plants than on Festuca rubra, and Treatments Festuca rubra+Glomus mossene and Agrostis hugoniana+Glomus intraradices were better than the others in each group. The root chamber had more microorganisms of various kinds than the other two, but the mycorrhizal chamber had a higher ratio of actinomycetes, especially of bacteria and fungi, which meant the difference between rhizosphere and mycorrhizosphere was reduced. All treatments on inoculation rate and hyphal density accorded with each other. The higher the inoculation rate, the higher the hyphal density. Mycorrhizal hyphal contribution to the formation of water-stable soil aggregates of 5-2 mm was 100% within the distance of 4-6 cm from the root surface, however not within the distance of 0-2 or 2-4 cm. The hyphae also had significant effect on water-stable soil aggregates (more than 70%) within the distance of 2-1 mm, but significantly less than within the distance of 0-2 and 4-6 cm, and did not show increased effect with the hyphal density. Effect of arbuscular mycorrhiza on steppe plants and infection rate of steppe plants varied with the species of the mycorrhiza and plants. The effect on Agrostis hugoniana was greater than on Festuca rubra in all inoculation treatments, and the effect of the combinations of Festuca rubra+Glomus mosseae and Agrostis hugoniana+Glomus intraradices was more significant than the other treatments. |