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Bulletin of Botanical Research ›› 2016, Vol. 36 ›› Issue (4): 596-604.doi: 10.7525/j.issn.1673-5102.2016.04.016

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Effect of Simulated N Deposition on Soil Respiration in a Larix olgensis Plantation Forest

ZHANG Jiao, HAO Long-Fei, WANG Qing-Cheng, FU Jiao-Jiao, ZHU Kai-Yue   

  1. Northeast Forestry University, Harbin 150040
  • Received:2016-01-05 Online:2016-07-15 Published:2016-06-15
  • Supported by:
    National "twelve five" scientific and technological project

Abstract: A two-year simulated N deposition experiment was conducted to explore the effects of different levels of nitrogen(N)deposition on soil respiration, with four different N supply levels, including control(CK, 0 g·m-2·a-1 N), low(N1, 5 g·m-2·a-1 N), intermediate(N2, 10 g·m-2·a-1 N)and high level(N3, 15 g·m-2·a-1 N), in a 26-year-old Larix olgensis plantation forest in Mao'ershan experimental forest farm of northeast forestry university. Average annual soil respiration rate under different treatments was significantly promoted in the first year(P<0.05); Average annual soil respiration rate and heterotrophic respiration rate were significantly decreased under N2 and N3 treatments(P<0.05), respectively, and average annual soil respiration rate was significantly increased(P<0.05), heterotrophic respiration rate had no difference compared with control(P>0.05)under N1 treatment, in the second year. Soil microbial biomass carbon was significantly increased under N1 treatment(P<0.05), while N2 and N3 had no difference compared with control(P>0.05); Significantly positive exponential relationship was detected between soil respiration and soil temperature in 5 and 10 cm(P<0.01). The temperature sensitivity of soil respiration(Q10)in both soil layer was increased under N1 treatment and decreased under N2 and N3 treatments compared with control, respectively. Soil respiration rate and its temperature sensitivity were altered under different N deposition levels, suggesting that the progress of soil carbon emission was accelerated under low levels of N deposition and slowed down under relatively high levels of N deposition in a short period.

Key words: Larix olgensis, plantation forest, N deposition, soil respiration, root respiration, heterotrophic respiration

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