Soil Nitrogen Leaching Loss Characteristics of Subtropical Secondary Forests of Different Ages and Cunninghamia Lanceolata Plantations

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    To assess whether soil nitrogen leaching would be affected by the planting subtropical evergreen broad-leaved secondary forests of different ages and Chinese fir (Cunninghamia lanceolata) plantations, soil column microcosm in situ culture experiment was used to compare the soil total nitrogen, nitrate and ammonium concentrations and fluxes between 9-year-old and 45-year-old secondary forests (with Castanopsis carlesii as the dominant tree species), and between C. carlesii and C. lanceolata plantations (both 9-year-old). The results showed that: (1) The concentrations of total nitrogen and nitrate in the four forest soils showed a general pattern of 45-year-old secondary forest > 9-year-old secondary forest > C. lanceolata plantation > C. carlesii plantation. The concentration of ammonium nitrogen was 45 years old secondary forest > C. lanceolata plantation > 9 years old secondary forest > C.carlesii plantation. (2) The fluxes of total nitrogen and nitrate of the four forest types in soil leaching solutions were as follows: 9-year-old secondary forest > 45-year-old secondary forest > C. lanceolata plantation > C. carlesii plantation, and soil ammonium leaching fluxes varied significantly among the four forest types between may and August, showing a order of C. lanceolata plantation > 45-year-old secondary forest > 9-year-old secondary forest > C. carlesii plantation. (3) The annual leaching fluxes of total nitrogen were 14.24, 13.27, 7.26 and 10.97 g/(m2·a), the nitrate leaching fluxes were 10.88, 9.97, 5.35 and 8.44, and the ammonium leaching fluxes were 1.97, 2.18, 1.59 and 2.26 g/(m2·a), in the 9-year-old and 45-year-old secondary forests, C. carlesii plantation and C. lanceolata plantation, respectively. In summary, the leaching loss of soil total nitrogen and nitrate decreased along the growth of subtropical evergreen broad-leaved secondary forest age, but the plantations of C. lanceolata accelerate nitrogen leaching loss from soils relative to the native tree species.

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  • Received:April 07,2023
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  • Online: December 27,2023
  • Published: December 28,2023