Abstract
The response of belowground biological processes to soil N availability in Larix gmelinii (larch) and Fraxinus mandshurica (ash) plantations was studied. Soil and root respiration were measured with Li-Cor 6400 and gas-phase O2 electrodes, respectively. Compared with the control, N fertilization induced the decreases of fine root biomass by 52% and 25%, and soil respiration by 30% and 24% in larch and ash plantations, respectively. The average soil microbial biomass C and N were decreased by 29% and 42% under larch stand and 39% and 47% under ash stand, respectively. While the fine root tissue N concentration under fertilized plots was higher 26% and 12% than that under control plots, respectively, the average fine root respiration rates were increased by 10% and 13% in larch and ash stands under fertilized plot, respectively. Soil respiration rates showed significantly positive exponential relationships with soil temperature, and a seasonal dynamic. These findings suggest that N fertilization can suppress fine root biomass at five branch orders (<2 mm in diameter), soil respiration, and soil microbial biomass C and N, and alter soil microbial communities in L. gmelinii and F. mandshurica plantations.
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Abbreviations
- Cmic and Nmic:
-
Soil microbial biomass C and N
- cfu b :
-
The number of colony forming units of bacteria
- cfu f :
-
fungi
- cfu a :
-
actinomycetes
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Acknowledgements
The authors thank Gu Jiacun, Hailong Sun, Changfu Huo, ** Zhang & Aizhen Liang
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Jia, S., Wang, Z., Li, X. et al. N fertilization affects on soil respiration, microbial biomass and root respiration in Larix gmelinii and Fraxinus mandshurica plantations in China. Plant Soil 333, 325–336 (2010). https://doi.org/10.1007/s11104-010-0348-8
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DOI: https://doi.org/10.1007/s11104-010-0348-8