Soil Respiration Intensity and Its Relationship with Carbon, Nitrogen Nutrition in High-Yield Corn Field
高产玉米田土壤呼吸强度及其与碳、氮营养的关系

The soil respiration intensity and its relationship with carbon, nitrogen nutrition were studied in high yield and normal yield soils from corn belts of Songliao Plain. The results showed that soil basic respiration intensity was higher in high yield soils than that in normal ones. But there was no obvious change of substrate-induced respiration intensity in high yield and normal yield soils. Substrate-induced respiration intensity of soils rapidly increased with the increase of glucose concentrations from 0-50 mg/kg. There was a significant negative correlation between the respiration quotient and the organic carbon, total nitrogen, available nitrogen, carbon to nitrogen ratio of soils. Theses results suggested that carbon and nitrogen of soils have controlled effect on soil respiration. Therefore, the appropriate application of organic manure is useful for enhancing soil fertility, increasing soil respiration, and improving soil nutrient structure.