Hippophae Rhamnoides Root Exudates Acids And Soil Nutrient

The eco-effects of Hippophae rhamnoides is decreasing due to its high death rate. So it is basic to study the mutual influence between acids and its soil, if we want to the reason for the decree from a perspective of combining plant physiology and ecology. This article takes Hippophae rhamnoides grown in gully region of loess as objective. By using ether extract and GC-MS detect method we examined the acids of Hippophae rhamnoides root exudates and research its changing character and rules. Via analysis of amount of acids and co relationship between soil and it pH value we come up with the following conclusion:(1) The Hippophae rhamnoides root exudates acids mostly were acetic acid, butanedioic acid, malic acid, azelaic acid, ethanedionic acid, tetradecanoic acid, hexadecanoic acid, benzoic acid, benzeneacetic acid, ferulic aicd and cinnamic acid. Benzoic acid with the higher propotion among them and showed the closest relation with the ammount of phenolic acids, while acetic acid with organic acids.(2) Growth states is the most important factor which made the content of Hippophae rhamnoides root exudates acids difference on the sunny slopes, while the stands is the most the most important factor on the shade slope. The total amount of root exudates acids in poor grown Hippophae rhamnoides is higher than it in better growth Hippophae rhamnoides because of lack of soil nutrient or higher pH; besides higher amount of phenolic acids especially benzoic acid would make Hippophae rhamnoides grow poorer.(3) Root exudates acids of Hippophae rhamnoides could improve the content of total N、total K and available K. Root exudates acids released from better grown Hippophae rhamnoides could make more influence on soil nutrient than root exudates acids released from poor grown Hippophae rhamnoides. And Hippophae rhamnoides grown in Seabuckthorn×Locust have the same phenomenon compared with it in Seabuckthorn an Seabuckthorn×Chinese Pine.(4) The kinds of root exudates acids of Hippophae rhamnoides in Seabuckthorn×Locus have a higher repetition rate which shows Hippophae rhamnoides have a more stable growth states in such mixed stands and shows Seabuckthorn×Locus is the best mixed stands.