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Storage, patterns and controls of soil organic carbon in the Tibetan grasslands

Storage, patterns and controls of soil organic carbon in the Tibetan grasslands,10.1111/j.1365-2486.2008.01591.x,Global Change Biology,YUANHE YANG,JIN

Storage, patterns and controls of soil organic carbon in the Tibetan grasslands   (Citations: 12)
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Journal: Global Change Biology - GLOB CHANGE BIOL , vol. 14, no. 7, pp. 1592-1599, 2008
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    • ...Active soil organic matter is defined as the active microbes and their microbial products by CENTURY model [21]...
    • ...It is an active factor in soil and takes a short time to reach equilibrium [21]...
    • ...Its turnover time is generally 20-40 years [21]...
    • ...Passive soil organic matter is stable and turnover time is 400-2000 years with strong resistance to physical, chemical decomposition [21]...

    Xiaojia Liet al. Dynamics of soil organic carbon in alpine meadow of Tibetan Plateau wi...

    • ...Sampling procedures and measurement methods for soil bulk density (BD), soil total N (STN) and soil organic carbon (SOC) have been described previously (Yang et al. 2008)...

    Jin-Sheng Heet al. Taxonomic identity, phylogeny, climate and soil fertility as drivers o...

    • ...[3] The SOC stock in high‐latitude/altitude ecosystems is of general interest because of the large carbon pool size and potential sensitivity to climate warming [Knorr et al., 2005; Davidson and Janssens, 2006; Yang et al., 2008; Post et al., 2009; Schuur et al., 2009]...
    • ...A number of studies have been conducted to investigate SOC stock in high‐latitude or high‐ altitude ecosystems [e.g., Ping et al., 2008; Yang et al., 2008; Tarnocai et al., 2009; Zimov et al., 2006, 2009]...
    • ...The unique climate and vegetation as well as minimal human disturbance make the plateau an ideal region to explore spatial patterns and temporal dynamics of soil carbon stock in high‐altitude ecosystems [Yang et al., 2008, 2009a]...
    • ...stock in the Tibetan alpine grasslands [Wang et al., 2002; Zhang et al., 2007; Yang et al., 2008, 2009a; Baumann et al., 2009]...
    • ...Tibetan Plateau. The climate on the plateau is cold and relatively humid, with mean annual temperature of 1.61°C and precipitation of 413.6 mm [Yang et al., 2008]...
    • ...2.2. Regional Soil Survey [7] We conducted four consecutive sampling campaigns during2001–2004andsampled405soilprofilesfrom135sites across the plateau (Figure 1). Soil profiles were sampled along the major roads on the plateau due to the extreme climatic conditions, limited seasonal accessibility, and sparse traffic network of the highest plateau [Yang et al., 2008]...
    • ...Detailed descriptions of field samplings and laboratory analyses are available in Yang et al. [2008]...
    • ...These data were spatially interpolated from the records of 43 climatic stations located above an elevation of 3000 meters across the plateau [Yang et al., 2008]...
    • ...4.1. SIC Estimation and Uncertainties Analysis [15] The SIC stock in the top 1 meter in the Tibetan grasslands was about 2.1 times the corresponding SOC stock estimated by Yang et al. [2008] (15.19 vs. 7.36 Pg C). Moreover, SIC stock in the top 1 meter in the Tibetan grasslands was close to that in desert and sandy regions of northern China (15.19 vs. 14.91 Pg C) [Feng et al., 2002]...
    • ...By contrast, the higher sampling density used in this study will help to reduce uncertainties in regional SIC estimates on the plateau (Figure 1) [Yang et al., 2008, 2010b]...
    • ...First, soil profiles were mostly sampled from the midlatitude areas of the plateau owing to extreme climatic conditions, limited seasonal accessibility and sparse traffic network of the highest plateau (Figure 1) [Yang et al., 2008], which will potentially introduce errors into the regional SIC evaluation (Figure 7). Second, soil samples were collected from the upper 1 meter of soil...
    • ...4.2. Contrasting Patterns Between SIC and SOC [17] SIC density was higher in the alpine steppe than in the alpine meadow, in contrast to previously reported patterns of SOC between the alpine steppe and meadow [Yang et al., 2008]...
    • ...The larger SOC density in alpine meadow compared to that in alpine steppe may result from the differences in plant production between these two grassland types [Yang et al., 2008]...
    • ...[18] Variations in SIC density along the environmental gradients across the plateau were different from those in SOC stock reported by Yang et al. [2008]...
    • ...Specifically, SOC density in Tibetan alpine grasslands exhibited an increasing trend along the temperature gradient and also significantly increased with annual precipitation and clay content [Yang et al., 2008]...
    • ...Thus, the positive associations between SOC density and environmental variables across the plateau may be largely driven by the stimulation of temperature, precipitation, and silt content on plant production in alpine grasslands [Yang et al., 2008]...
    • ...[19] Vertical patterns of SIC stock in the Tibetan alpine grasslands were different from the corresponding patterns of SOC observed by Yang et al. [2008]...

    Yuanhe Yanget al. Soil inorganic carbon stock in the Tibetan alpine grasslands

    • ...Based on the previous estimates of 0.16 Pg C yr −1 in annual NPP [Piao et al., 2006a], 0.35 Pg C in biomass stocks [Piao et al., 2007a], and 7.4 Pg C in SOC stocks [Yang et al., 2008] of Qinghai‐Tibetan grasslands, one can estimate that the average turnover times for the whole Plateau grassland carbon stocks is about 48 yr, which is comparable to the results derived from V3 simulation (40 years)...

    Kun Tanet al. Application of the ORCHIDEE global vegetation model to evaluate biomas...

    • ...Soil texture was determined using a particle size analyzer (Mastersizer 2000, Malvern, UK) after removal of organic matter and calcium carbonates (Yang et al., 2008)...

    Y. H. Yanget al. Aboveground biomass in Tibetan grasslands

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