Long-term natural succession improves nitrogen storage capacity of soil on the Loess Plateau, China
Lei Deng A , Kai-bo Wang B and Zhou-ping Shangguan A C
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, P.R. China.
B State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, P.R. China.
C Corresponding author. Email: shangguan@ms.iswc.ac.cn
Soil Research 52(3) 262-270 https://doi.org/10.1071/SR12377
Submitted: 23 December 2012 Accepted: 11 December 2013 Published: 31 March 2014
Abstract
Land-use change resulting from natural succession enhances the nitrogen (N) accumulation capacity of terrestrial ecosystems. To explore those factors that foster changes in soil N storage under evolving conditions of vegetation succession, a study on N storage at differing stages along a 150-year chronosequence was conducted in the Ziwuling Forest Region in the central part of the Loess Plateau, China. A principal finding was the rapid increase in N storage in the 0–60 cm soil layer, which achieves a stable value after the shrub community stage (~50–60 years), leading to the overall long-term (~150 years) accumulation of soil stored N in the post-abandonment secondary forest. Soil N accumulated mainly in the pioneer stage and showed a significant increase before the shrub community stage (P < 0.05). The N storage in the 0–60 cm soil layer changed from 5.8 to 8.4 Mg ha–1 during the transition from abandoned farmland (~3–5 years) to climax community (Quercus liaotungensis Koidz forest) (~150 years). The N storage values were higher in the upper (<20 cm) than the deeper soil layers (>20 cm). In the topsoil (0–20 cm), N storage values showed a markedly positive correlation with soil organic carbon (SOC), total soil N and fine roots. In the deeper soil layers (20–40 and 40–60 cm) there was a correlation only with TN. Soil bulk density, soil water content and soil pH were not the determining factors behind N storage values in the topsoil (0–20 cm), although they did show negative, positive and negative correlations, respectively. In addition, they showed no consistent correlations in the lower soil layer (<20 cm). The results suggest that changes to N storage values were the result of the accumulation of SOC, total N and primary productivity during the process of forest succession, and this capacity is positively related to post-abandonment forest succession on the Loess Plateau, China.
Additional keywords: China, natural succession, nitrogen storage, Ziwuling Forest Region.
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