Stoichiometrc Characteristics of Soil Aggregates in Subtropical Eroded Red Soil under Vegetation Restoration
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National Key Technology R&D Program of China (No. 2013BAC08B03) and the National Natural Science Foundation of China (Nos. 41171232 , 41371512)

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    Abstract:

    【Objective】This study was done to elucidate C, N and P distributions in soil aggregates and their stoichiometric characteristics in eroded red soil under vegetation restoration relative to history of the restoration. 【Method】Six sample plots were set up on slope lands of typical eroded red soil under vegetation restoration with different restoration history (0, 5, 10, 15, 30 and 80 years) located in Hetian Town, Changting County, Fujian Province of Subtropical China. Soil samples were collected from different soil layers (0~20 cm and 20~40 cm) of the six plots for analysis of contents of organic carbon, total nitrogen, total phosphorus in soil aggregates different in particle size (>5 mm, 2~5 mm, 0.5~1 mm, 1~2 mm, 0.25~5 mm and <0.25 mm). 【Result】 Results show that the contents of organic carbon, total nitrogen, total phosphorus in soil aggregates varied in the range of 2.06~27.71 g•kg-1, 0.54~2.12 g•kg-1 and 0.034~0.189 g•kg-1, respectively, and C:N, C:P and N:P did in the range of 3.06~13.05, 21.4~185.6 and 5.62~18.20, respectively. On the whole the contents of organic carbon, total nitrogen, total phosphorus and C:N increased in all fractions of soil aggregates in both soil layers with the restoration going on (P<0.05), and the trend was more significant in the 0~20 cm soil layer than in the 20~40 cm layer, while soil C:P and N:P displayed a rising-falling-rising trend, and . C:P deceased with soil depth, and N:P did not vary much. The contents of organic carbon, total nitrogen and total phosphorus, and C:N and C:P on the whole increased with the aggregates going down in particle size (P<0.05), except for the plot of 0 year, while N:P did not vary much with aggregate particle size (P>0.05). The content organic carbon, total nitrogen and total phosphorus in soil aggregates were remarkably positively related to their respective ones in the soil. In the soil aggregates the contents of organic carbon and total N positively related to C:N, the content of organic carbon was to C:P, and the content of total phosphorus was to N:P. 【Conclusion】All the findings in the study demonstrate that vegetation restoration mitigates soil erosion and significantly increases the contents of organic carbon, total nitrogen and total phosphorus and improves the function of soil aggregates as carbon and nitrogen pools, and what is more, P in the aggregates is the major factor restraining rehabilitation of the degraded ecosystem.

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OU Xiaolin, CHEN Zhibiao, CHEN Zhiqiang, CHEN Haibin, REN Tianjing. Stoichiometrc Characteristics of Soil Aggregates in Subtropical Eroded Red Soil under Vegetation Restoration[J]. Acta Pedologica Sinica,2018,55(5):1156-1167.

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History
  • Received:January 30,2018
  • Revised:April 10,2018
  • Adopted:June 05,2018
  • Online: June 25,2018
  • Published: