Publication Date
1985
Location
Kyoto Japan
Description
The numbers, activity and seasonal dynamics of nitrogen metabolic bacteria in soils of Qinghai-Xizang alpine meadows were studied at Haibei Alpine Meadow Ecosystem Research Station. The numbers of these microbes were highest in the 0-10 cm soil layer and these numbers decreased with the deepening of the soil. In the surface soil layer, the denitrifying bacteria were dominant, the next were the nonsymbiotic anaerobic nitrogen-fixing bacteria, and the ammonifying and nitrifying bacteria showed the lowest counts. The numbers and activity of nitrogen metabolic bacteria also showed markedly seasonal dynamics. The microbial peaks usually appeared between June and August. The ammonifying and nitrifying bacteria were dominant in soils of the swamp and the Elymus nu tans meadow; the denitrifying bacteria were high in soils of most vegetation types, and the anaerobic nonsymbiotic nitrogen-fixing bacteria were the highest in soils of the swamp meadow. The ammonification activity in the surface soil layer of the alpine meadow was rather strong, but the nitrification was comparatively weak. The ratio of the former to the later was 230:1. Azotobacter could not be found in the soils of Haibei alpine meadow. The nitrogen fixation was mainly accomplished by anaerobic nonsymbiotic nitrogen-fixing bacteria. The experimental data also indicated that the degradation of grassland resulted in the lowering of soil fertility.
Citation
Li, Jiazao; Yang, Tao; and Zhu, Guiru, "Studies on the Numbers, Activity and Seasonal Dynamics of Nitrogen Metabolic Microorganisms in Soils of Qinghai-Xizang Alpine Meadow" (1985). IGC Proceedings (1985-2023). 30.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/30)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Studies on the Numbers, Activity and Seasonal Dynamics of Nitrogen Metabolic Microorganisms in Soils of Qinghai-Xizang Alpine Meadow
Kyoto Japan
The numbers, activity and seasonal dynamics of nitrogen metabolic bacteria in soils of Qinghai-Xizang alpine meadows were studied at Haibei Alpine Meadow Ecosystem Research Station. The numbers of these microbes were highest in the 0-10 cm soil layer and these numbers decreased with the deepening of the soil. In the surface soil layer, the denitrifying bacteria were dominant, the next were the nonsymbiotic anaerobic nitrogen-fixing bacteria, and the ammonifying and nitrifying bacteria showed the lowest counts. The numbers and activity of nitrogen metabolic bacteria also showed markedly seasonal dynamics. The microbial peaks usually appeared between June and August. The ammonifying and nitrifying bacteria were dominant in soils of the swamp and the Elymus nu tans meadow; the denitrifying bacteria were high in soils of most vegetation types, and the anaerobic nonsymbiotic nitrogen-fixing bacteria were the highest in soils of the swamp meadow. The ammonification activity in the surface soil layer of the alpine meadow was rather strong, but the nitrification was comparatively weak. The ratio of the former to the later was 230:1. Azotobacter could not be found in the soils of Haibei alpine meadow. The nitrogen fixation was mainly accomplished by anaerobic nonsymbiotic nitrogen-fixing bacteria. The experimental data also indicated that the degradation of grassland resulted in the lowering of soil fertility.
