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Citation:

Response of Soil Microbe Flora to Simulated Nitrogen Deposition at a Plantation of Cunninghamia lanceolata

  • Received Date: 2014-03-10
  • The response of soil microbe amount to simulated nitrogen deposition was analyzed by spread plate method. Nitrogen loadings were designed at 2 nitrogen form and 5 levels as N0, N1, N2, N3 and N4 at the doses of 0, 20, 40, 60 and 80 kg ·hm-2·a-1, respectively. The results indicated that: The first year of nitrogen deposition, high nitrogen level had more significant effect on the amount of microbial, the change range of others was larger. The second year of nitrogen deposition, there was no remarkable difference between treatments and the change range was smaller. There was no remarkable difference between all treatments and the change range was smaller in December, so when we research the changing of total microbial, we should not collect soil samples in December. The nitrogen deposition affect microorganisms. In general, low concentration of nitrogen deposition had promoting effect on the growth, while the highest concentration inhibited it NH4+-N2 or N3 and NO3-N3 were the optimal concentrations for the growth of total microbial. The microbe amount responded to N treatment in all groups of microbes, but varied because of different bacteria group and nitrogen treatment level. The changing of bacterial is consistent with total microbial. At the beginning of natural nitrogen deposition, nitrate nitrogen deposition had greater effects on the amount of bacteria than ammonium did.N2 and N3 were the optimal concentrations for the growth of bacteria. The low concentration of nitrogen deposition had promoting effect on the growth of fungi, while high concentration inhibited it. NH4+-N1 and NO3-N3 were the optimal concentrations for the growth of fungi. Ammonium nitrogen deposition had greater effects on the amount of fungi than nitrate did. After one year of nitrogen deposition, high nitrogen slightly promote the growth of actinomyces.
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Response of Soil Microbe Flora to Simulated Nitrogen Deposition at a Plantation of Cunninghamia lanceolata

  • 1. Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China
  • 2. The Centre of Subtropical Forestry, Chinese Academy of Forestry, Fenyi 336600, Jiangxi, China

Abstract: The response of soil microbe amount to simulated nitrogen deposition was analyzed by spread plate method. Nitrogen loadings were designed at 2 nitrogen form and 5 levels as N0, N1, N2, N3 and N4 at the doses of 0, 20, 40, 60 and 80 kg ·hm-2·a-1, respectively. The results indicated that: The first year of nitrogen deposition, high nitrogen level had more significant effect on the amount of microbial, the change range of others was larger. The second year of nitrogen deposition, there was no remarkable difference between treatments and the change range was smaller. There was no remarkable difference between all treatments and the change range was smaller in December, so when we research the changing of total microbial, we should not collect soil samples in December. The nitrogen deposition affect microorganisms. In general, low concentration of nitrogen deposition had promoting effect on the growth, while the highest concentration inhibited it NH4+-N2 or N3 and NO3-N3 were the optimal concentrations for the growth of total microbial. The microbe amount responded to N treatment in all groups of microbes, but varied because of different bacteria group and nitrogen treatment level. The changing of bacterial is consistent with total microbial. At the beginning of natural nitrogen deposition, nitrate nitrogen deposition had greater effects on the amount of bacteria than ammonium did.N2 and N3 were the optimal concentrations for the growth of bacteria. The low concentration of nitrogen deposition had promoting effect on the growth of fungi, while high concentration inhibited it. NH4+-N1 and NO3-N3 were the optimal concentrations for the growth of fungi. Ammonium nitrogen deposition had greater effects on the amount of fungi than nitrate did. After one year of nitrogen deposition, high nitrogen slightly promote the growth of actinomyces.

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