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Chinese Journal of Ecology ›› 2021, Vol. 40 ›› Issue (6): 1549-1556.doi: 10.13292/j.1000-4890.202106.015

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Effects of poplar plantation types on soil phosphorus fractions.

WANG Ya-ru1,2, LIN Xin-yu1,2, HUI Hao1,2, SUN Xiao-dan1,2, CHEN Bin1,2, PAN Yu-yang1,2, CHEN Jian-wei3, GUAN Qing-wei1,2*   

  1. (1Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing 210037, China; 2College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China; 3Jiangsu Sanhe Horticulture Co. Ltd, Wuxi 214000, Jiangsu, China)  
  • Online:2021-06-10 Published:2021-12-10

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Abstract: Phosphorus is an important limiting nutrient in subtropical forest ecosystems. Clarifying the effects of different poplar plantation types on soil phosphorus fractions is important for the scientific management of poplar plantation in subtropical region. In this study, Populus euramericana pure forest (PE), Populus euramericana +Photinia serrulata mixed forest (PS), and Populuseuramericana+Ligustrum lucidum mixed forest (PL) were selected as the objects. The Hedley phosphorus fraction method modified by Sui was used to examine the effects of different poplar plantation types on soil phosphorus fractions in soil layers of 0-20, 20-40, and 40-60 cm. The results showed that the contents of total phosphorus, total organic phosphorus, available phosphorus, active phosphorus (H2O-Pi, NaHCO3-Po, NaHCO3-Pi) and moderately active phosphorus (NaOH-Po, NaOH-Pi) were higher in the two mixed forests than PE, with stronger effects in PL than PS. The content of available phosphorus in 0-60 cm soil layer of PS and PL was 52.4% and 55.3% higher than that of PE, respectively. Total inorganic phosphorus in 0-20 cm soil layer of PL was significantly decreased. In the 0-20 cm soil layer, the content of NaOH-Pi in the mixed forests was significantly higher than that in the PE, while the contents of H2O-Pi and NaHCO3-Pi in the 20-40 cm soil layer and the contents of total phosphorus, total organic phosphorus and NaHCO3-Po in the 0-40 cm soil layer of both mixed forests were significantly higher than that of the pure forest. The contents of soil phosphorus fractions generally decreased with soil depth. Results of redundancy analysis showed that acid phosphatase activity, soil microbial biomass P and soil total organic carbon were important factors affecting the changes of soil phosphorus fractions. Compared with the pure forest, the multi-layered mixed forest of tree and shrub species can improve soil phosphorus availability and alleviate the phosphorus limitation in subtropical regions.

Key words: pure poplar forest, mixed forest, soil phosphorus fraction, microbial biomass P, acid phosphatase.