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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.


Daily mean air temperature and soil temperature at organic soil layer and mineral soil layer at different elevation of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.
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pone.0132443.g001: Daily mean air temperature and soil temperature at organic soil layer and mineral soil layer at different elevation of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.

Mentions: Obviously temperature fluctuations were recorded during the study period at the three sites (Fig 1). Minimum and Average air temperature and soil temperature increased with the decrease of elevation during the study period (Table 2). As compared with air temperatures at the 3600 m, average air temperatures at the 3000 m and at the 3300 m were 2.01°C and 1.49°C higher, respectively. Moreover, mean soil temperature in the organic soil layer (OL) and mineral soil layer (ML) at the 3000 m was 1.49°C and 1.09°C higher than that at the 3600 m, respectively. However, there was little difference in mean soil temperature in both the OL and ML between the 3300 m and 3600 m. Soil gravimetrical water at the three sites showed little change during most of during the study period (Fig 2).


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)

Daily mean air temperature and soil temperature at organic soil layer and mineral soil layer at different elevation of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0132443.g001: Daily mean air temperature and soil temperature at organic soil layer and mineral soil layer at different elevation of subalpine and alpine forests in the eastern Qinghai-Tibetan Plateau.
Mentions: Obviously temperature fluctuations were recorded during the study period at the three sites (Fig 1). Minimum and Average air temperature and soil temperature increased with the decrease of elevation during the study period (Table 2). As compared with air temperatures at the 3600 m, average air temperatures at the 3000 m and at the 3300 m were 2.01°C and 1.49°C higher, respectively. Moreover, mean soil temperature in the organic soil layer (OL) and mineral soil layer (ML) at the 3000 m was 1.49°C and 1.09°C higher than that at the 3600 m, respectively. However, there was little difference in mean soil temperature in both the OL and ML between the 3300 m and 3600 m. Soil gravimetrical water at the three sites showed little change during most of during the study period (Fig 2).

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.