This research analyse on the soil nitrogen variation features of different ecological patterns in estern desertification region

Guizhou province. The author gathered soil samples of woodlands

grasslands

agricultural land and de-farming land

then carried out physics and chemical analysis. The results showed soil organic matter

nitrogen levels overall lower

its content increase with the increasing of vegetation cover

degree with the strengthening of soil erosion and reduction

and the nitrogen levels of return with the return of soil nitrogen level limit increases then increased by tiine pasted. Based on this conclusion

the paper deduced that it is possible to restore the nitrogen fertility under natural condition.