The Effect Of Fertilizing Management On Nitrogen Transition In Black Soil

The paper studied on the rules of edaphon diversification (aerobic self-nitrogen-fixation bacteria, aminating bacteria, nitrite bacteria, denitrobacteria ) in the nitrogen transition and soil enzyme transformation (urease, albumen enzyme, peroxid enzyme, catalase) under different fertilizing management in agro ecosystem in the black soil district of Songnen Plain and effects on the intensity of the spontaneous nitrogen fixation, amination, nitrification and denitrification in soil in order to further study the mechanism of nitrogen transition in soil, supply scientific base for reasonable use of the nitrogen in soil and guidance for the nitrogenous fertilizer utilization in field practice and provide scientific reference for protecting black soil resource, reducing agricultural non-point pollution and producing the organic food.Main conclusions were as below:1.Single fertilizer utilization decreased the amount of aerobic self-nitrogen-fixation bacteria in soil while farm manure used by itself and companying with fertilizer both activated the growth of self-nitrogen-fixation bacteria, but they also restrained the soil spontaneous nitrogen fixation. It demonstrates that farm manure used by itself and companying with fertilizer provided nutrition and good environment for self-nitrogen-fixation bacteria and promoted their growth and breeding. But the decline of soil spontaneous nitrogen fixation ability showed that self-nitrogen-fixation bacteria wouldn't function under the soil eutrophication.2.Soil pH was obviously in negative correlation to the intensity of denitrification. Especially the correlation of the high quantity fertilizer treatment and the mixing of manure and fertilizer in equal proportion treatment got notable level. That was that soil denitrification ability increased with soil pH decreasing. The enhancement of denitrification ability must result in the output of greenhouse gases, like N2O, rising.3.The rise of soil temperature speeded the growth and breeding of aminating bacteria and soil aminating bacteria could generate the amination so soil temperature well positively related to the intensity of soil aminating function and it was in favor of soil organic nitrogen translation into the form available to crops.4.The increase of soil humidity affected on aerobic self-nitrogen-fixation bacteria's growth and breeding, on the other hand soil humidity also promoted the soil denitration and added the N2O flux so as to lose soil nitrogen. Thus irrigation should be arranged according to the temperature at...