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- Title
Effects of soil moisture on gross N transformations and NO emission in acid subtropical forest soils.
- Authors
Cheng, Yi; Wang, Jing; Wang, Shen-Qiang; Zhang, Jin-Bo; Cai, Zu-Cong
- Abstract
Soil moisture changes, arising from seasonal variation or from global climate changes, could influence soil nitrogen (N) transformation rates and N availability in unfertilized subtropical forests. A N dilution study was carried out to investigate the effects of soil moisture change (30-90 % water-holding capacity (WHC)) on potential gross N transformation rates and NO and NO emissions in two contrasting (broad-leaved vs. coniferous) subtropical forest soils. Gross N mineralization rates were more sensitive to soil moisture change than gross NH immobilization rates for both forest soils. Gross nitrification rates gradually increased with increasing soil moisture in both forest soils. Thus, enhanced N availability at higher soil moisture values was attributed to increasing gross N mineralization and nitrification rates over the immobilization rate. The natural N enrichment in humid subtropical forest soils may partially be due to fast N mineralization and nitrification under relatively higher soil moisture. In broad-leaved forest soil, the high NO and NO emissions occurred at 30 % WHC, while the reverse was true in coniferous forest soil. Therefore, we propose that there are different mechanisms regulating NO and NO emissions between broad-leaved and coniferous forest soils. In coniferous forest soil, nitrification may be the primary process responsible for NO and NO emissions, while in broad-leaved forest soil, NO and NO emissions may originate from the denitrification process.
- Subjects
SOIL moisture; CLIMATE change research; SOIL composition; NITRATES; FOREST soils
- Publication
Biology & Fertility of Soils, 2014, Vol 50, Issue 7, p1099
- ISSN
0178-2762
- Publication type
Article
- DOI
10.1007/s00374-014-0930-y