Shifts in soil organic carbon and nitrogen dynamics for afforestation in central China

文献类型： 外文期刊

第一作者： Dou, Xiaolin

作者： Dou, Xiaolin;Shu, Xiao;Zhang, Quanfa;Cheng, Xiaoli;Dou, Xiaolin;Xu, Xia

作者机构：

关键词： Afforestation;delta C-13;Density fractionation;delta N-15;Soil aggregates;Soil organic matter

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

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收录情况： SCI

摘要： The afforestation has been proposed as a primary means of sequestering carbon (C) from the atmosphere, thereby mitigating climate change. However, consequences of afforestation on soil organic C and nitrogen (N) dynamics due to spatial heterogeneity are not fully understood. The objectives of this study were to identify the consequences of 18 years of afforestation on C and N dynamics in the Danjiangkou Reservoir area of central China. Soil samples from the woodland, shrubland, cropland and adjacent open area soils (i.e. the control) were separated into four aggregate sizes (>2000 mu m, 250-2000 mu m, 53-250 mu m and <53 mu m), and three density fractions [free light fraction (LF), intra-aggregate particulate organic matter (iPOM) and mineral-associated organic matter (mSOM)]. All fractions were analyzed for their C and N content, and delta C-13 and delta N-15 values. Afforestation enhanced the soil C and N storage, primarily due to increases in soil C and N storage of macroaggregates (>2000 mu m) with the largest (65-87%) fraction in iPOM. The C: N ratios generally increased from the cropland to shrubland to woodland across all fractions. The C-13 values indicated that the fastest decay rates (k = 0.024 yr(-1)) in LF of macroaggregates (>2000 mu m) was in woodland, but the fastest decay rates (0.114-0.137 yr(-1)) in iPOM of all aggregates were observed in cropland. Meanwhile, the most enriched delta N-15 values (0.87-3.81) were found in cropland soil. Our results suggest that afforestation could alter weight distribution of soil fractions and increase the soil organic C and N storage, thereby affecting the turnover and stability of SOM. (C) 2015 Elsevier B.V. All rights reserved.

分类号： Q14`X171

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