Changes of soil carbon and nitrogen in revegetation and nature restoration sites in the northern region of Loess Plateau, China

Abstract

Soil carbon, nitrogen and phosphorus were measured for sloping fields, terraced fields, grassland and woodland in Liudaogou Village, Shanxi Province,. The growth condition of planted Pinus tabulaeformis was also studied. The carbon and nitrogen contents of sloping fields and terraced fields were very low as 0.3% and 0.03%. Those were increased about twice in woodland and grassland. Tree height of Pinus tabulaeformis was less than 4m, and the annual extension of stem was less than 20cm. On the same micro-topographical type, the growth of Pinus tabulaeformis was affected by soil hardenss.