Distribution characteristics and influencing factors of soil organic carbon in alpine ecosystems on the Tibetan Plateau transect, China |
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Authors: | Yuqiang Tian Hua Ouyang Minghua Song Haishan Niu Qiwu Hu |
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Institution: | (1) Institute of Resources Science, College of Resources Science & Technology, Beijing Normal University, Beijing, 100875, China;(2) Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;(3) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | The undisturbed regions along the Qinghai-Tibet Highway crossing the natural zones of montane desert, alpine meadow-steppe,
and montane shrub-coniferous forest were chosen as the study areas. Soil samples were collected at 23 sites and the relations
between the influencing factors and distribution of soil organic carbon (SOC) content were studied. The results indicated
that the order of SOC content for the whole soil profile with different vegetations and in the horizontal direction was shown
as below: forest>shrub>meadow>steppe>desert. All the SOC contents of the top 10 cm soil layers of forest, shrub and meadow
vegetations, as well as that of the top 20 cm soil layers in steppe, in the vertical direction, were higher than those of
corresponding lower soil layers. However, the SOC content in the desert soil was in accordance. The grey correlative analysis
between the climatic factors and SOC content in the top soil show that precipitation was the dominant climatic factor affecting
the distribution of SOC in the Tibetan Plateau transect. The influence of precipitation on the horizontal distribution of
SOC decreased with the increase of precipitation in the horizontal direction. The vertical distribution of SOC along the soil
profile was greatly affected by precipitation or the soil clay content in top soil layers, and was clearly influenced by soil
silt content or sand content in lower soil layers, as well. The influences of both soil bulk density and soil pH on the vertical
distribution of SOC along the soil profile gradually declined. The plant biomass was the most important biotic factors affecting
the distribution of the SOC.
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Translated from Journal of Zhejiang University (Agriculture & Life Sciences), 2007, 33(4): 443–449 译自: 浙江大学学报(农业与生命科学版)] |
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Keywords: | Tibetan Plateau China transect alpine ecosystem soil organic carbon influencing factors |
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