The current status and characteristics of land capacity degeneration of eucalyptus plantation in Leizhou Peninsula;

Soil degradation and sustainable management of Chinese fir plantation.;

The soil degradation of Eucalyptus plantation was evaluated from water status, nutrition status and the integrated effect of plantation on water and fertility.

The paper analyzed the cause and countermeasure of soil degradation and yield reduction of artificial fir plantation in recent years and its solutions, it was summarized that increasing wood yield need to pay great attention to the quality of artificial fir plantation, and improving soil power must attend to the selection, crop rotation and mixture of tree species and fertilizing of wood land.

Numerical analysis method was used to study the soil fertility degradation in the reclamation process of forest land on low hilly red soil with cultivated time.

The main research work can be summarized as follows:Firstly, the resistance deterioration of suspension bridge hangers is analyzed, including the damage of protection system for hangers and the deterioration of steel wire.

Research on grassland degradation using spectral mixture model;

Climate background analysis of grassland degradation in the Yellon River important water source supply area——a case study of Maqu County;