Hydrologic controls on soil carbon and nitrogen cycles. II. A case study

被引:101
作者
D'Odorico, P
Laio, F
Porporato, A
Rodriguez-Iturbe, I
机构
[1] Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA
[2] Politecn Torino, Dipartimento Idraul Trasporti & Infrastrutt Civil, I-10129 Turin, Italy
[3] Princeton Univ, Dept Civil & Environm Engn, Princeton Environm Inst, Princeton, NJ 08544 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0309-1708(02)00095-7
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
The nitrogen and carbon cycles in the broad-leafed savanna at Nylsvley (S. Africa) are modeled using the stochastic approach presented by Porporato et al. [Adv Water Res (this issue)], An accurate representation of the hydrological mechanisms that control the nitrogen cycle at the daily time scale is shown to be necessary to capture the impact of the high-frequency variability of the soil moisture on the nitrogen and carbon dynamics, The fluctuations of the random precipitation forcing propagate to soil moisture, carbon, and nitrogen dynamics, giving rise to a gamut of fluctuations at different time scales. Long simulations are carried out to achieve a probabilistic characterization of the dynamics of the state variables under different rainfall regimes. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码:59 / 70
页数:12
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