STUDY ON THE SOIL NUTRIENT VARIETY OF DIFFERENT PLANTATIONS

In order to reveal grasslands plantations potential soil fertility decline trend,a typical plot investigation was conducted,soil samples were collected with indoor method to study two different plantations and grassland soil nutrient in the Yijiahe rangeland.The results showed that the pH value increased with the soil layer depth increment,but rest indexes descend;the organic content,total N and alkali-hydrolysable nitrogen content of Populus spp plantations plot A and B is higher in the 2 cm soil layer;the alkali-hydrolysable nitrogen of Larix gmelini plantations plots C,D and G are lower in each soil layers,but the total phosphorus value are higher;the plantations construction influence soil nutrient content of 8 plots is small in the 60cm soil layer;the plantations construction influence the content of total potassium and available potassium is not significant.