Topographic Variation of Soil Nitrogen Dynamics at Walker Branch Watershed, Tennessee
文献类型：期刊论文
| 作者 | Garten, Charles T. ; Huston, Michael A. ; Thoms, Christopher A. |
| 刊名 | Forest Science
 |
| 出版日期 | 1994 |
| 卷号 | 30期号:2页码:497-512 |
| 中文摘要 | Understanding the spatial and temporal variability of soil nitrogen (N) transformations is central to quantifying the N dynamics and productivity of ecosystems. The objectives of this work were to examine spatial and temporal variation of soil N dynamics and to identify factors correlated with topographic variation in soil N dynamics in a forest watershed. Net N mineralization and net nitrification potential were measured by aerobic laboratory incubations of surface (0-7 cm) mineral soils. Principal components analysis was used to describe sampling sites across the watershed based on 13 site characterization variables. A topographic index used in hydrologic modeling, In (α/tan ), was calculated for each site as the natural logarithm of the ratio of the upslope drainage area per unit contour length (α) to the local slope angle (tan ). Soils from valley floors had greater total N concentrations, lower carbon-to-nitrogen (C:N) ratios, greater potential net nitrification, and greater microbial activity (as indicated by short-term urease assays) than soils from ridges. Mean net nitrification potential was 0.59 g N g-1 d-1 in surface soils from valley floors and was < 0.01 on ridges and slopes. The first principal component was related to the N and C properties of soils, leaf litter, and leaf fall at a site. The second principal component was related to forest stand composition. The topographic index was significantly correlated with important variables related to soil N dynamics. Once calibration data are derived, this index may be useful as a first approximation to total soil N concentrations and soil C:N ratios in forest watersheds because In (α/tan ) can be calculated from geographic information systems that contain topographic data |
| 公开日期 | 2014-02-27 |
| 源URL | [http://ir.xtbg.org.cn/handle/353005/4850]  |
| 专题 | 西双版纳热带植物园_文献共享 |
| 推荐引用方式 GB/T 7714 | Garten, Charles T.,Huston, Michael A.,Thoms, Christopher A.. Topographic Variation of Soil Nitrogen Dynamics at Walker Branch Watershed, Tennessee[J]. Forest Science,1994,30(2):497-512. |
| APA | Garten, Charles T.,Huston, Michael A.,&Thoms, Christopher A..(1994).Topographic Variation of Soil Nitrogen Dynamics at Walker Branch Watershed, Tennessee.Forest Science,30(2),497-512. |
| MLA | Garten, Charles T.,et al."Topographic Variation of Soil Nitrogen Dynamics at Walker Branch Watershed, Tennessee".Forest Science 30.2(1994):497-512. |
入库方式： OAI收割
来源：西双版纳热带植物园
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