Soil active organic matter is the main source of soil nutrients,and plays an important role in the formation and stabilization of soil aggregate.

A comparative study was made on the soil active organic matter in a broadleaved forest and two Chinese fir(Cunninghamia lanceolata)plantations in subtropical region of China,aimed to understand the effects of forest conversion and continuous plantation on soil organic C and nutrient status.

Changes of soil active organic carbon pool under different land use types;

Reponses of soil labile organic carbon to different harvest methods and land use patterns after cutting were measured in Maoershan Experimental Forest Farm of northeast forestry university.

The results suggests that after partial cut with greater intensity in short-term,the amount of soil labile organic carbon will increase,but after forestation following clear cutting it will decrease in the temperate second growth of northeast China.

All of the above illuminated that short-term no-tillage could bring distinct changes of active soil organic carbon; Moreover (qCO2) and CPMI could indicate the changes of soil organic carbon pool more sensitively than other indices, which could be used as the important indicators for evaluating soil quality.

The research focused on active soil organic carbon(ASOC) in the processes of rocky desertification.

A new pretreatment method-orthogonal signal correction (OSC) was presented to eliminate the influence of the noise on soil organic matter (SOM) content prediction.

The spatial variability of soil organic matter(SOM)in the Shiqu County was expressed by the spatial analytic approaches such as ordinary kriging(OK)on the basis of the software ArcGIS Desktop 9.

Results showed that continuous application of FYM increased SOM successively and eventually reached such a high level as 60g?kga?a(c)-1 in SOM content while maintaining high crop yield.