[Effects of Converting Farmland into Forest and Grassland on Soil Nitrogen Component and Conversion Enzyme Activity in the Mountainous Area of Southern Ningxia].

The effects of the policy of converting farmland to forest and grassland on soil nitrogen content and conversion enzyme activity were studied. , spp., and and a corn control were examined to determine the concentrations of seven soil nitrogen components and the activity of two nitrogen conversion enzymes.

[Effects of the Farmland-to-Forest/Grassland Conversion Program on the Soil Bacterial Community in the Loess Hilly Region].

This study investigated the effects of the program aimed at converting farmland into forest or grassland on the soil bacterial diversity in the Loess Hilly region. Corn land was selected as the experimental control, and land and land were selected as the experimental lands. Soil from three different land use types were selected as subjects.

[Characteristics and Coupling Relationship of Soil Carbon and Nitrogen Transformation During In-situ Mineralization Cultivation in Forestlands in the Mountain Area of Southern Ningxia].

The study aimed to investigate the characteristics and relationship between soil carbon and nitrogen transformation of artificial forestlands, which is one type of vegetation restoration in the mountain area of Southern Ningxia. Soil samples were collected every two months in a year from three forestlands, and the characteristics of soil organic carbon, dissolved carbon, microbial biomass carbon, organic nitrogen, inorganic nitrogen, soil ammonification, nitrification and mineralization rates, microbial immobilization rates and coupling of soil carbon and nitrogen were studied by the in-situ closed-top PVC tube incubation methods. The results showed that: in the process of in-situ incubation, the most obvious changes of carbon and nitrogen were in 61-120 days which was mainly affected by soil moisture; There were significantly positive correlations between the soil organic carbon and the total nitrogen, microbial biomass carbon and microbial biomass nitrogen, dissolved carbon and dissolved nitrogen; Transformation rates of soil organic carbon had significant effects on the soil ammonification, nitrification and microbial immobilization rates.