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How environmental and vegetation factors affect spatial patterns of soil carbon and nitrogen in a subtropical mixed forest in Central China

  • 2015 International Symposium on Forest Soils
  • Published:
Journal of Soils and Sediments Aims and scope Submit manuscript

Abstract

Purpose

Soil properties are highly heterogeneous in forest ecosystems, which poses difficulties in estimating soil carbon (C) and nitrogen (N) pools. However, little is known about the relative contributions of environmental factors and vegetation to spatial variations in soil C and N, especially in highly diverse mixed forests. Here, we examined the spatial variations of soil organic carbon (SOC) and total nitrogen (TN) in a subtropical mixed forest in central China, and then quantified the main drivers.

Materials and methods

Soil samples (n = 972) were collected from a 25-ha forest dynamic plot in Badagonshan Nature Reserve, central China. All trees with diameter at breast height (DBH) ≥1 cm and topography data in the plot were surveyed in detail. Geostatistical analyses were used to characterize the spatial variability of SOC and TN, while variation partitioning combined with Mantel’s test were used to quantify the relative contribution of each type of factors.

Results and discussion

Both surface soil (0–10 cm) and subsurface soil (10–30 cm) exhibited moderate spatial autocorrelation with explainable fractions ranged from 31 to 47 %. The highest contribution to SOC and TN variation came from soil variables (including soil pH and available phosphorus), followed by vegetation and topographic variables. Although the effect of topography was weak, Mantel’s test still showed a significant relationship between topography and SOC. Strong interactions among these variables were discovered. Compared with surface soil, the explanatory power of environmental variables was much lower for subsurface soil.

Conclusions

The differences in relative contributions between surface and subsurface soils suggest that the dominating ecological process are likely different in the two soil depths. The large unexplained variation emphasized the importance of fine-scale variations and ecological processes. The large variations in soil C and N and their controlling mechanisms should be taken into account when evaluating how forest managements may affect C and N cycles.

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Acknowledgments

This study was funded by the National Basic Research Program of China (grant no. 2014CB954004) and the National Natural Science Foundation (grant nos. 31270515 and 31400463). We thank the Badagongshan National Nature Reserve for field assistance and support. We are grateful for constructive comments and suggestions from anonymous reviewers and the Editor.

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Authors and Affiliations

  1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China

    Qianxi Li, Xinggang Wang, Mingxi Jiang, Yu Wu, Xiaolu Yang, Chang Liao & Feng Liu

  2. University of Chinese Academy of Sciences, Beijing, China

    Qianxi Li, Xinggang Wang, Yu Wu & Chang Liao

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  1. Qianxi Li
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  2. Xinggang Wang
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  3. Mingxi Jiang
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  4. Yu Wu
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  6. Chang Liao
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  7. Feng Liu
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Correspondence to Feng Liu.

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Responsible editor: Zhiqun Huang

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Li, Q., Wang, X., Jiang, M. et al. How environmental and vegetation factors affect spatial patterns of soil carbon and nitrogen in a subtropical mixed forest in Central China. J Soils Sediments 17, 2296–2304 (2017). https://doi.org/10.1007/s11368-016-1491-5

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  • DOI: https://doi.org/10.1007/s11368-016-1491-5

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