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Net nitrogen mineralization and nitrification rates in forest soil in northeastern Taiwan.
- Source :
- Soil Science & Plant Nutrition; Feb2010, Vol. 56 Issue 1, p177-185, 9p, 3 Charts, 3 Graphs
- Publication Year :
- 2010
-
Abstract
- We used a laboratory incubation approach to measure rates of net N mineralization and nitrification in forest soils from Fu-shan Experimental Forest WS1 in northern Taiwan. Net mineralization rates in the O horizon ranged from 4.0 to 13.8 mg N kg<superscript>−1</superscript> day<superscript>−1</superscript>, and net nitrification rates ranged from 2.2 to 11.6 mg N kg<superscript>−1</superscript> day<superscript>−1</superscript>. For mineral (10–20 cm depth) soil, net mineralization ranged from 0.06 to 2.8 mg N kg<superscript>−1</superscript> day<superscript>−1</superscript> and net nitrification rates ranged from 0.02 to 2.8 mg N kg<superscript>−1</superscript> day<superscript>−1</superscript>. We did not find any consistent differences in N mineralization or nitrification rates in soils from the upper and lower part of the watershed. We compared the rates of these processes in three soil horizons (to a soil depth of 30 cm) on a single sampling date and found a large decrease in both net N mineralization and nitrification with depth. We estimated that the soil total N pool was 6,909 kg N ha<superscript>−1</superscript>. The present study demonstrates the importance of the stock of mineral soil N in WS1, mostly organic N, which can be transformed to inorganic N and potentially exported to surface and ground water from this watershed. Additional studies quantifying the rates of soil N cycling, particularly multi-site comparisons within Taiwan and the East Asia–Pacific region, will greatly improve our understanding of regional patterns in nitrogen cycling. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00380768
- Volume :
- 56
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Soil Science & Plant Nutrition
- Publication Type :
- Academic Journal
- Accession number :
- 48346089
- Full Text :
- https://doi.org/10.1111/j.1747-0765.2009.00427.x