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土壤置换法研究土壤基质对微生物碳氮磷的影响(PDF/HTML)

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

Issue:
2017年02期
Page:
73-80
Column:
研究论文
publishdate:
2017-03-23

Article Info:/Info

Title:
Effects of substrates on soil microbial carbon, nitrogen and phosphorus based on soil replacement method
Article ID:
1000-2006(2017)02-0073-08
Author(s):
ZHAO Juan WANG Xingchang
Center for Ecological Research, Northeast Forestry University, Harbin 150040,China
Keywords:
soil substrate succession type soil microbe stoichiometry
Classification number :
S718.5
DOI:
10.3969/j.issn.1000-2006.2017.02.011
Document Code:
A
Abstract:
【Objective】Examine the effects of soil substrates on microbial biomass carbon(nCmic)nitrogen(nNmic), and phosphorus(nPmic)by comparing their values in the early stage of vegetation succession. 【Method】By using the soil displacement experiment performed included three treatments. Treatment A involved replacing the original soil of experimental plots(0-30 cm depth)with the A-horizon soil of an adjacent temperate broadleaved stand, whereas Treatment B involved replacing the soil with B-horizon soil, and treatment C involved replacing the soil with C-horizon soil. The three treatments simulated the secondary succession of clear-cut forests or bare soil without a seed bank or primary succession, respectively, and four replicates were used for each treatment. This study compared the difference of the nCmic, nNmic, nPmic, and their stoichiometry in different soil substrate. 【Result】① In 2004, the nCmic, nNmic and nPmicof treatment A were significantly greater than those of treatments B or C(P < 0.05), and the nCmic/nNmic ratio of treatment A was lower than those of treatments B or C, whereas the nCmic/nPmic and nNmic/nPmic ratios of treatment A were greater than those of treatments B or C. The nCmic/nCsoil(soil carbon), nNmic/nNsoil(soil nitrogen)and nPmic/nPsoil(soil phosphorus)values of treatment A were significantly greater than those of treatments B or C(P < 0.05), except for the nNmic/nNsoil value of treatment C. ② In 2014, the nCmic, nNmic and nPmic of treatment A were significantly greater than those of treatments B or C(P < 0.05), and the nCmic/nNmic ratio of treatments A and B were lower than that of treatment C, whereas the nCmic/nPmic and nNmic/nPmic ratios of treatment A were greater than those of treatments B or C. The nCmic/nCsoil, nNmic/nNsoil, and nPmic/nPsoil values of treatment A were greater than those treatments B or C. ③ After the 10-year succession, the nCmic, nNmic and nPmic of the three treatments increased, except for the nPmic of treatment B. The nCmic/nNmic ratio of the three treatments declined, but the nCmic/nPmic and nNmic/ nPmic ratios increased. Among the three treatments, the nCmic/nNmic ratio of treatments B and C decreased significantly(P < 0.05), whereas the nNmic/nPmic ratio of treatments A and C increased significantly(P < 0.05). The nCmic/nCsoil, nNmic/nNsoil and nPmic/nPsoil values of three treatments also increased with the succession. 【Condusion】 The physical and chemical properties of the different substrates were the main determinants of the spatial patterns of nCmic, nNmic, nPmic, and their stoichiometry.

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Last Update: 2017-03-23