Coupling Between Plant And AM Fungal Species Diversity Under Arid Areas Of Water And Salt Gradient

Mycorrhizal fungi are a class of fungi in soil and plant mutualism consortiumformed, including arbuscular mycorrhizal fungi (AM fungi) that are not onlywidespread, but also could improve the nutritional status of plants to plant growth,improve plant resistance and other characteristics. This class fungus is important formaintaining the host plant diversity and ecosystem function and stability.The main get the following results:1. Vertical Aqikesu river channel north shore from south to north, soil moisture,soil pH, conductivity, salinity, total salt gradually reduced, where soil moisture is formmaximum10.93percent to minimum of0.64%; on four plots of vegetation transectsurvey had nine families,17genus and20species. Populus trees important value inthe previous three plots are the highest, ammodendron is the highest important valueof the fourth plots where is the smallest soil moisture. Important values atintermediate shrubs, herbs important value is generally low.18kinds of host plants, inaddition to Salsola,17kinds of plants have AM fungal infection, infection rates were75.3±4.2%,77.5±4.3%,63.7±6.2%,31.3±5.3%. which were isolated andidentified5genus36species of AM fungi, which has12species of Acaulospora sEntrophospra3species, Glomus16,Gigaspora1species, Scutellospora4species.Acaulospora is desert ecosystems in arid zones advantage genus, Glomus advantage isextremely arid soil conditions, Gigaspora is drought tolerant,but not salinity.2. Studies have shown that: plants and AM fungi Gleason index was significantlypositively correlated, Shannon-Wiener index correlation minimum. Host trees wassignificantly positively correlated with parasitic roots AM fungi Margalef index,Gleason index was significantly positively correlated, Pielou evenness indexcorrelation minimum; host shrubs significantly associated with parasitic roots AMfungi Gleason index, and Pielou index was significantly negative related,Shannon-Wiener index correlation minimum; host index and parasitic herb root AM fungal diversity index each no significant correlation.3. Through the diversity of plants and AM fungi β compare results, As the soilwater and salt gradient is by more salt water to less salt,water development, plants andAM fungi community composition was similar rises, the rate of Species instead ofweakening, but instead of AM fungi is faster rate of speed.4. Principal component analysis derived soil moisture, soil pH, soil total Ca andMg is the main component of soil full impact of AM fungi in soil physical andchemical properties. Binomial fit, find AM fungal infection rate less affected byenvironmental factors, but the abundance of spores and spore density greater impacton soil moisture content is the most important factor, pH is the main limiting factor,so the water ample, the highest salinity less diversity of AM fungi in the soilenvironment.5. It is analyzing on four plots plant root tree, form advantages and easy parasiticplant. AM fungal spore density separation, abundance. Parasitic plants are not theadvantage of the plant. Along the water and salt gradient, AM fungi parasitic shrubdensity separation, abundance are lower than trees and herbs’. Easy parasitic plantroot parasite abundance of AM fungi accounted for all desert vegetation separating68.42%~81.82%of AM fungi play an important role in maintaining, in which theabundance of AM fungi parasitic herb Seriphidium santolinum (Schrenk) Poljak. rootaccount for the separation of the total abundance52.94%~59.09%degree of AMfungal diversity maintained the largest contribution.