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模拟氮沉降对典型阔叶红松林土壤微生物群落特征的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017年05期
Page:
7-12
Column:
专题报道
publishdate:
2017-09-30

Article Info:/Info

Title:
Effects of simulated nitrogen deposition on soil microbial biomass carbon and nitrogen in a mixed broadleaf Korean pine forest
Article ID:
1000-2006(2017)05-0007-06
Author(s):
SONG Lei LIN Youwei JIN Guangze
Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
Keywords:
Keywords:nitrogen deposition soil microbial biomass carbon(SMBC) soil microbial biomass nitrogen(SMBN) mixed broadleaf Korean pine forest
Classification number :
S718.5; S714
DOI:
10.3969/j.issn.1000-2006.201607039
Document Code:
A
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.

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