The changes in total organic nitrogen,hydrolysable nitrogen,total phosphorus,available phosphorus,and available potassium and acidity were studied in rhizosphere and non-rhizosphere soil at different development stages in larch(Larix olgensis) plantations by the method of comparison and analysis.The results showed that total amount of acidic,alkaline and free amino acid,hydrolysable nitrogen in rhizosphere and non-rhizosphere soil,neutral amino acid,rapidly available potassium,total phosphorus,available pho...