Effects of simulated nitrogen deposition on soil microbial biomass carbon and 
nitrogen in a mixed broadleaf Korean pine forest

doi:10.3969/j.issn.1000-2006.201607039

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (05): 7-12.doi: 10.3969/j.issn.1000-2006.201607039

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Effects of simulated nitrogen deposition on soil microbial biomass carbon and nitrogen in a mixed broadleaf Korean pine forest

SONG Lei, LIN Youwei, JIN Guangze

Center for Ecological Research, Northeast Forestry University, Harbin 150040, China

Online:2017-10-18 Published:2017-10-18

Abstract

Abstract: 【Objective】This study explored the effects of increasing nitrogen deposition on soil microorganisms in a mixed broadleaf Korean pine(Pinus koraiensis)forest.【Method】A simulated nitrogen deposition experiment was performed in a mixed broadleaf Korean pine forest. Nitrogen deposition levels were contacted as control(N0, 0 kg/(hm²·a)), low N(N1, 30 kg/(hm²·a)), medium N(N2, 60 kg/(hm²·a)), and high N(N3, 120 kg/(hm²·a)). Soil samples were collected from 0-10 cm and ≥10-20 cm soil layers monthly from mid-May to mid-September in 2014, and soil microbial biomass carbon(SMBC)and soil microbial biomass nitrogen(SMBN)were measured.【Result】First, the simulated nitrogen deposition did not influence the vertical changes of SMBC, SMBN, or SMBC/SMBN; seasonal changes of SMBC and SMBN between the four treatments plots during the growing season showed a unimodal curve; and the seasonal dynamics of SMBC/SMBN were obvious and their ranges were different. The 0-10 cm soil layer in the N0 treatment plot had the smallest range(2.83-6.97). Second, the simulated nitrogen deposition significantly affected the SMBC in June and August in the 0-10 cm layer and the SMBC/SMBN of May, June, and August in the 0-10 cm layer(P<0.05). However, the simulated nitrogen deposition did not significantly affected seasonal averages of SMBC, SMBN and SMBC/SMBN.【Conclusion】There was a obvious effect of simulated nitrogen deposition on soil microbial biomass in the mixed broadleaf Korean pine forest in some specific months. However, to find a distinct effect throughout the whole growing season would require longer simulated nitrogen deposition.

CLC Number:

S718.5
S714

SONG Lei, LIN Youwei, JIN Guangze. Effects of simulated nitrogen deposition on soil microbial biomass carbon and nitrogen in a mixed broadleaf Korean pine forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2017, 41(05): 7-12.

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Effects of simulated nitrogen deposition on soil microbial biomass carbon and nitrogen in a mixed broadleaf Korean pine forest

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