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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (4): 1088-1096.doi: 10.13287/j.1001-9332.202004.006

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Effects of broadleaved tree plantation on soil phosphorus fractions and availability in diffe-rent soil layers in a logged Cunninghamia lanceolata woodland

WANG Tao1,2, WAN Xiao-hua1,2, WANG Lei1,2, ZOU Bing-zhang3, WANG Si-rong3, HUANG Zhi-qun1,2*   

  1. 1School of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
    2Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
    3Fujian Shanghang Baisha Forestry Farm, Shanghang 364205, Fujian, China.
  • Received:2019-11-26 Online:2020-04-20 Published:2020-04-20
  • Contact: *E-mail: zhiqunhuang@hotmail.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31570604, 31600495), the National Science Fund for Distinguished Young Scholars (31232212), the Fujian Natural Science Foundation (2018J01714), and the Fujian Forestry Science and Technology Foundation ([2018]26).

Abstract: Phosphorus (P) limitation is one of the major issues for the management of subtropical plantations. Understanding the effects of tree species transition from conifer to broadleaved trees on soil P fraction and availability in different soil layers are of great significance for the sustainable development of subtropical forests. We compared changes in soil chemical properties, P fraction and availability across 0-100 cm soil profile between Mytilaria laosensis and Cunninghamia lanceolata plantations, which were initially reforested from C. lanceolata plantation in the spring of 1993. The results showed that soil organic P content in both plantations decreased significantly with soil depth. Compared with C. lanceolata, the M. laosensis plantation significantly increased soil available P content by 35.7% and 86.2% in the 0-10 and 10-20 cm, respectively. The contents of soil labile P and moderately labile P decreased significantly with soil depth in both plantations. The contents of labile P and moderately labile P were significantly higher in the surface soil (0-20 cm), while the non-labile P in the 80-100 cm was increased by 13.6%, and the free iron content in the 20-80 cm significantly decreased. Results of redundancy analysis showed that dissolved organic carbon and free iron were the most important factors influencing P fraction in those plantations. Tree species transition from C. lanceolata to M. laosensis could change the pattern of soil P fraction in soil profile, and greatly enhance soil P availability.