Changes in mass, carbon, nitrogen, and phosphorus in logs decomposing for 30 years in three Rocky Mountain coniferous forests
Changes in mass, carbon, nitrogen, and phosphorus in logs decomposing for 30 years in three Rocky Mountain coniferous forests
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DOI：
10.1139/cjfr-2017-0001
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发表时间：
2017-07
影响因子：
2.2
通讯作者：
C. Prescott;Kirsten Corrao;Anya M. Reid;J. Zukswert;S. Addo-Danso
中科院分区：
文献类型：
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作者：
C. Prescott;Kirsten Corrao;Anya M. Reid;J. Zukswert;S. Addo-Danso
粗木质残体（CWD）分解速率及其养分通量的估算是碳（C）和养分收支模型的重要组成部分。在一个30年的现场实验中，我们定期测量质量剩余和营养物质浓度在日志部分的松树，云杉，冷杉在自然，成熟的针叶林在加拿大阿尔伯塔。松树的预测周转时间（t95;年）为43-44年，云杉为42-60年，冷杉为38-46年。从最佳拟合模型推断，我们预测这些日志的分解将在50-60年内完成。碳氮比（C：N）下降的大部分分解期间，和三个物种的比例收敛在<200在90%的质量损失。只有当原木失去了90%的原始C和C：N下降到<200时，才会发生N的净释放。碳磷比（C：P）下降，并在90%质量损失时收敛于500-1000。没有证据表明，即使在90%的质量损失的日志净P释放。它...
Estimates of decomposition rates of coarse woody debris (CWD) and fluxes of nutrients therein are essential components of carbon (C) and nutrient budget models. In a 30-year field experiment, we periodically measured mass remaining and nutrient concentrations in log segments of pine, spruce, and fir in natural, mature coniferous forests in Alberta, Canada. The predicted turnover times (t95; years) were 43–44 years for pine, 42–60 years for spruce, and 38–46 years for fir. Extrapolating from best-fit models, we predict that decomposition of these logs would be complete within 50–60 years. The ratio of carbon to nitrogen (C:N) declined for most of the decomposition period, and ratios of the three species converged at <200 at 90% mass loss. Net release of N occurred only after logs had lost 90% of their original C and C:N had declined to <200. The ratio of carbon to phosphorus (C:P) declined and converged at 500–1000 at 90% mass loss. There was no evidence of net P release from logs even at 90% mass loss. It...