Enhancement of carbon sequestration in soil in the temperature grasslands of northern China by addition of nitrogen and phosphorus.
Enhancement of carbon sequestration in soil in the temperature grasslands of northern China by addition of nitrogen and phosphorus.
复制标题
添加氮、磷提高我国北方温温草原土壤固碳能力
DOI：
10.1371/journal.pone.0077241
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Yu G
中科院分区：
文献类型：
--
作者：
He N;Yu Q;Wang R;Zhang Y;Gao Y;Yu G
氮（N）沉降的增加在世界范围内是常见的。反应性氮输入在何处、如何以及是否影响陆地生态系统的土壤碳固存是一个备受关注的问题。为探讨氮磷配施条件下草原区土壤固碳潜力，于2006 - 2012年在中国北方温带草原进行了田间试验。实验研究了6个水平的N（0-56克N m-2年-1），6个水平的P（0-12.4克P m-2年-1），和控制方案。结果表明，N、P的同时添加显著增加了凋落物和根系的碳输入，从而提高了草地土壤总碳储量。与对照地相比，0-100 cm土层土壤有机碳（SOC）随施氮梯度的变化呈二次曲线变化，范围为156.8 ~ 1352.9 g Cm-2（R2 = 0.99，P < 0.001），随施磷梯度的变化呈二次曲线变化，范围为293.6 ~ 788.6 g Cm-2（R2 = 0.56，P = 0.087）。土壤无机碳（SIC）随施氮量的增加呈二次曲线下降。施氮后，草地净固碳量（包括植物、根系、SIC和SOC）从-128.6到729.0gCm-2呈线性增加（R2 = 0.72，P = 0.023），施磷后，草地净固碳量从248.5到698 gCm-2呈线性增加（R2 = 0.82，P = 0.014）。我们的研究表明，氮添加对土壤碳动态的影响是复杂的，未来的研究应包括土壤固碳在草原SOC和SIC在各种情况下的评估。
Increased nitrogen (N) deposition is common worldwide. Questions of where, how, and if reactive N-input influences soil carbon (C) sequestration in terrestrial ecosystems are of great concern. To explore the potential for soil C sequestration in steppe region under N and phosphorus (P) addition, we conducted a field experiment between 2006 and 2012 in the temperate grasslands of northern China. The experiment examined 6 levels of N (0–56 g N m-2 yr-1), 6 levels of P (0–12.4 g P m-2 yr-1), and a control scenario. Our results showed that addition of both N and P enhanced soil total C storage in grasslands due to significant increases of C input from litter and roots. Compared with control plots, soil organic carbon (SOC) in the 0–100 cm soil layer varied quadratically, from 156.8 to 1352.9 g C m-2 with N addition gradient (R2 = 0.99, P < 0.001); and logarithmically, from 293.6 to 788.6 g C m-2 with P addition gradient (R2 = 0.56, P = 0.087). Soil inorganic carbon (SIC) decreased quadratically with N addition. The net C sequestration on grassland (including plant, roots, SIC, and SOC) increased linearly from -128.6 to 729.0 g C m-2 under N addition (R2 = 0.72, P = 0.023); and increased logarithmically, from 248.5 to 698 g C m-2under P addition (R2 = 0.82, P = 0.014). Our study implies that N addition has complex effects on soil carbon dynamics, and future studies of soil C sequestration on grasslands should include evaluations of both SOC and SIC under various scenarios.
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