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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 dynamics of soil microbial biomass C (MBC) at different elevation 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.g003: Effects of experimental warming on the dynamics of soil microbial biomass C (MBC) at different elevation 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: MBC in both the OL and ML displayed similar patterns with temperature fluctuations at the three elevations in our two year study (Fig 3). MBC in the two layers sharply decreased during the onset of soil freezing (OF) and soil thawing periods (ET), but a relatively high MBC were measured during the deep soil frozen period (DF). Altitude had significant effects on soil MBC in both the OL and ML during the study periods except for in the OL during the late growing (LG) period in the second year. MBC in the OL decreased with the decrease of elevation except for during the early growing period (EG). Few changes of MBC in the OL of soil were observed with the changes of soil temperature during the growing season (GS). In addition, altitude, sampling date, soil layer and their interaction all showed significant effects on MBC (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 dynamics of soil microbial biomass C (MBC) at different elevation 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.g003: Effects of experimental warming on the dynamics of soil microbial biomass C (MBC) at different elevation 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: MBC in both the OL and ML displayed similar patterns with temperature fluctuations at the three elevations in our two year study (Fig 3). MBC in the two layers sharply decreased during the onset of soil freezing (OF) and soil thawing periods (ET), but a relatively high MBC were measured during the deep soil frozen period (DF). Altitude had significant effects on soil MBC in both the OL and ML during the study periods except for in the OL during the late growing (LG) period in the second year. MBC in the OL decreased with the decrease of elevation except for during the early growing period (EG). Few changes of MBC in the OL of soil were observed with the changes of soil temperature during the growing season (GS). In addition, altitude, sampling date, soil layer and their interaction all showed significant effects on MBC (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.