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Seasonal Dynamics of Soil Microbial Biomass C and N along an Elevational Gradient on the Eastern Tibetan Plateau, China.

Gou X, Tan B, Wu F, Yang W, Xu Z, Li Z, Zhang X - PLoS ONE (2015)

Bottom Line: MBC and MBN in the soil organic layer decreased with the decrease of elevation but the opposite was true in the mineral soil layer.Warming had stronger effects on soil microbial biomass in the organic layer than in the mineral soil layer.The results indicated that future warming would alter soil microbial biomass and biogeochemical cycling in the forest ecosystems on the eastern Tibetan Plateau.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Ecological Forestry Engineering, Institute of Ecology & Forestry, Sichuan Agricultural University, No. 211, Huimin Road, Wenjiang District, Chengdu 611130, P. R. China.

ABSTRACT
Little information is available on the seasonal response of soil microbial biomass to climate warming even though it is very sensitive to climate change. A two-year field experiment was conducted in the subalpine and alpine forests of the eastern Tibetan Plateau, China. The intact soil cores from 3,600 m site were incubated in three elevations (3,000 m, 3,300 m and 3,600 m) to simulate climate warming. Soil microbial biomass carbon (MBC) and nitrogen (MBN) were measured at different periods (early growing season [EG], late growing season [LG], onset of soil freezing period [OF], deep soil frozen period [DF] and soil thawing period [ET]) from May 2010 to August 2012. Average air temperature and soil temperature increased with the decrease of elevation during the experimental period. MBC and MBN showed a sharp decrease during the OF and ET in both organic layer and mineral layer at the three sites. Additionally, a relatively high MBC was observed during the DF. MBC and MBN in the soil organic layer decreased with the decrease of elevation but the opposite was true in the mineral soil layer. Warming had stronger effects on soil microbial biomass in the organic layer than in the mineral soil layer. The results indicated that future warming would alter soil microbial biomass and biogeochemical cycling in the forest ecosystems on the eastern Tibetan Plateau.

No MeSH data available.


Effects of experimental warming on the ratios of soil microbial biomass C to N (MBC/MBN) at different elevations of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.Error bars indicate standard error. *P < 0.05. n = 5. Abbreviations: OL, organic soil layer; ML, mineral soil layer; A1, 3000 m; A2 3300 m; A3, 3600 m.
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pone.0132443.g005: Effects of experimental warming on the ratios of soil microbial biomass C to N (MBC/MBN) at different elevations of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.Error bars indicate standard error. *P < 0.05. n = 5. Abbreviations: OL, organic soil layer; ML, mineral soil layer; A1, 3000 m; A2 3300 m; A3, 3600 m.

Mentions: During the two year study, the ratio of MBC to MBN in the OL slightly decreased during the LG, and that exhibited an obvious decrease between the OF and ET (Fig 5). However, the ratio of MBC to MBN in the ML showed a significant decrease dynamic during the OF in the first year and an obvious decrease dynamic during the LG in the second year. Moreover, the ratio of MBC to MBN in the soil OL increased with the decrease of elevation in the growing season (GS), but which decreased during the non-growing season (NGS) in two years study. In addition, altitude showed insignificant effects on the ratio of MBC to MBN (Table 3).


Seasonal Dynamics of Soil Microbial Biomass C and N along an Elevational Gradient on the Eastern Tibetan Plateau, China.

Gou X, Tan B, Wu F, Yang W, Xu Z, Li Z, Zhang X - PLoS ONE (2015)

Effects of experimental warming on the ratios of soil microbial biomass C to N (MBC/MBN) at different elevations of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.Error bars indicate standard error. *P < 0.05. n = 5. Abbreviations: OL, organic soil layer; ML, mineral soil layer; A1, 3000 m; A2 3300 m; A3, 3600 m.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493142&req=5

pone.0132443.g005: Effects of experimental warming on the ratios of soil microbial biomass C to N (MBC/MBN) at different elevations of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.Error bars indicate standard error. *P < 0.05. n = 5. Abbreviations: OL, organic soil layer; ML, mineral soil layer; A1, 3000 m; A2 3300 m; A3, 3600 m.
Mentions: During the two year study, the ratio of MBC to MBN in the OL slightly decreased during the LG, and that exhibited an obvious decrease between the OF and ET (Fig 5). However, the ratio of MBC to MBN in the ML showed a significant decrease dynamic during the OF in the first year and an obvious decrease dynamic during the LG in the second year. Moreover, the ratio of MBC to MBN in the soil OL increased with the decrease of elevation in the growing season (GS), but which decreased during the non-growing season (NGS) in two years study. In addition, altitude showed insignificant effects on the ratio of MBC to MBN (Table 3).

Bottom Line: MBC and MBN in the soil organic layer decreased with the decrease of elevation but the opposite was true in the mineral soil layer.Warming had stronger effects on soil microbial biomass in the organic layer than in the mineral soil layer.The results indicated that future warming would alter soil microbial biomass and biogeochemical cycling in the forest ecosystems on the eastern Tibetan Plateau.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Ecological Forestry Engineering, Institute of Ecology & Forestry, Sichuan Agricultural University, No. 211, Huimin Road, Wenjiang District, Chengdu 611130, P. R. China.

ABSTRACT
Little information is available on the seasonal response of soil microbial biomass to climate warming even though it is very sensitive to climate change. A two-year field experiment was conducted in the subalpine and alpine forests of the eastern Tibetan Plateau, China. The intact soil cores from 3,600 m site were incubated in three elevations (3,000 m, 3,300 m and 3,600 m) to simulate climate warming. Soil microbial biomass carbon (MBC) and nitrogen (MBN) were measured at different periods (early growing season [EG], late growing season [LG], onset of soil freezing period [OF], deep soil frozen period [DF] and soil thawing period [ET]) from May 2010 to August 2012. Average air temperature and soil temperature increased with the decrease of elevation during the experimental period. MBC and MBN showed a sharp decrease during the OF and ET in both organic layer and mineral layer at the three sites. Additionally, a relatively high MBC was observed during the DF. MBC and MBN in the soil organic layer decreased with the decrease of elevation but the opposite was true in the mineral soil layer. Warming had stronger effects on soil microbial biomass in the organic layer than in the mineral soil layer. The results indicated that future warming would alter soil microbial biomass and biogeochemical cycling in the forest ecosystems on the eastern Tibetan Plateau.

No MeSH data available.