Effects Of Salt-alkaline Habitat On The Contents Of Various Solutes In The Shoot Of Chloris Virgata

Chloris virgata is a kind of native forages with strong salt-alkali resistant. This essay take it as the object of study which adopts the different thought from the experiment controlled in laboratory. It does the physiology and ecology research under the open environment with salt-alkali. Through analyzing the various solute contents in Chloris virgata's stem and leaf under the salinization environment and the relationship with the degree of salinization it inquire into the mechanisms that Chloris virgata suits salinization environment.The experiment was done in the surrounding salinization grassland of Grassland Ecosystem Research Station of Northeast Normal University ,Changling County, Jilin Province. According to the soil salinization degree author selected 45 random samples and measured each sample's soil conductivity, pH, buffer capacity and as indicators of soil stress reflecting the soil salinization's degree. For each sample author took Chloris virgata's stem and leaf and analyzed the contents of various solutes as a threat variable indicator reflecting plants'physiological response. It analyzed the inter-relationship between stress factors such as conductivity, pH, buffer capacity and threat variable indicator of various items by statistics method.It takes the soil conductivity(salinity) as the independent variable and analyzes Chloris virgata's various threat variable indicators and the relationship between them. The results shows that Na+ and CI- contained in Chloris virgata stems and leaves are significantly increased with the soil electrical conductivity (salinity) increasing; while K+, NO3- are significantly decreased , SO42- and H2PO4 have no significant changes. With the soil electrical conductivity increasing, total organic acid, malic acid, citric acid, oxalic acid contained in Chloris virgata stems and leaves are significantly increased, while succinct acid is significantly decreased , lactic acid, formic acid, acetic acid, tartaric acid have no significant changes.Taking electrical conductivity, Ph and buffer capacity as the independent variable and various threat variable indicators as result variable author did the multiple regression analysis in order to know the relationship between threat variable factors and threat variable responses. The result shows except for the electrical conductivity which has great effect on the content of Na+ ,pH is the most influential factor on the other ions, buffer capacity is the least one. This result may mean high pH is possible one of the important factors of salinization environment. The results of multiple regression analysis also show pH has great effect on the content of succinic acid, electrical conductivity is the most influential factor on the other organic acid content( including the total organic acid content).The three factors and Succinic acid content reveals negative correlation, others are positive one. This reflects the complexity of organic acid metabolism conducted by chloris virgata in order to suit the saline environment.