Characteristics of nitrogen forms and mineralization in paddy soils of long-term fertilization experiment;

Effects of temperature on organic carbon mineralization in paddy soils with different clay content;

Degradation process of paddy soils with high yield caused by irrational fertilization;

Physiological toxicity of Cd~(2+) to representative microbial species in submerged paddy soil;

With traditional culture method and improved Hungate anaerobic technique, the influence of Cd2+ on the numbers of anaerobic and aerobic microbial populations in submerged paddy soil was studied by the MPN (the Most Probable Number) method and the roll tube method.

Variations of diversity of microbial genes in submerged paddy soil stressed by heavy metal cadmium were studied using modern molecular biotechnology which includes directly extracting total DNA from paddy soil, amplifying 16S rDNA and their V3 variable region by PCR, the denaturing gradient gel electrophoresis (DGGE).

By field investigation and sampling,and laboratory analysis,this paper attempted to study the local conditions and fertility properties of paddy soils of several typical rice production areas in Hunan Province.

The contribution of anaerobic methane oxidation to the whole methane oxidation is investigated by monitoring the activities of anaerobic and aerobic oxidation of methane in paddy soils composed mechanically of <0.

24 genera of algae were found in untreated paddy soil samples.