Journalartikel

Jahr der Veröffentlichung: 2019

Seiten: 629-641

Zeitschrift: Biology and Fertility of Soils

Bandnummer: 55

Heftnummer: 6

ISSN: 0178-2762

DOI Link: https://doi.org/10.1007/s00374-019-01379-2

Verlag: Springer

Abstract: 
The mechanisms of the different responses of soil gross nitrogen (N) transformation to increasing temperature or moisture in different types of soils are still unclear. Here, we conducted two N-15 tracing experiments to investigate the effects of increasing temperature (15 degrees C and 25 degrees C) or moisture (30%, 45%, and 60% water-filled pore space (WFPS)) on soil gross N transformation rates for two soils (organic (O) and mineral (A) horizon soils) in a temperate forest. As the temperature increased from 15 to 25 degrees C or moisture increased from 30 to 60% WFPS, total mineralization rates increased by 4.5-fold and 2.5-fold respectively, total NH4+ immobilization rates increased by 173.2-fold and 7.6-fold respectively, and autotrophic nitrification rates increased by 0.7-fold and 0.6-fold respectively in the O horizon. Under the same treatment, the changes in autotrophic nitrification rates, NH4+ immobilization rates, and mineralization rates were much smaller in the A horizon than in the O horizon. We propose that the difference between the two horizons in the responses to changing temperature and moisture was due to the different resource status. The O horizon could provide more substrates than the A horizon, resulting in a stronger response of N processes to changing temperature and moisture. Resource status also affected the competition for substrates between NH4+ immobilization and autotrophic nitrification. The N transformation rates were higher in the O horizon than in the A horizon, consistent with higher microbial biomass N, microbial respiration rate, and amoA gene abundance in the O horizon. Our results suggest that the activity switch of microbes and the competition for resources are important biotic factors regulating potential responses of soil N cycling processes to changing abiotic factors.

Harvard-Zitierstil: Sun, L., Xia, Z., Sang, C., Wang, X., Peng, B., Wang, C., et al. (2019) Soil resource status affects the responses of nitrogen processes to changes in temperature and moisture, Biology and Fertility of Soils, 55(6), pp. 629-641. https://doi.org/10.1007/s00374-019-01379-2

APA-Zitierstil: Sun, L., Xia, Z., Sang, C., Wang, X., Peng, B., Wang, C., Zhang, J., Müller, C., & Bai, E. (2019). Soil resource status affects the responses of nitrogen processes to changes in temperature and moisture. Biology and Fertility of Soils. 55(6), 629-641. https://doi.org/10.1007/s00374-019-01379-2