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Profile storage of organic/inorganic carbon in soil: From forest to desert

机译：土壤中有机/无机碳的轮廓存储：从森林到沙漠

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摘要

Understanding the distribution of organic/inorganic carbon storage in soil profile is crucial for assessing regional, continental and global soil C stores and predicting the consequences of global change. However, little is known about the organic/inorganic carbon storages in deep soil layers at various landscapes. This study was conducted to determine the soil organic/inorganic carbon storage in soil profile of 0-3 m at 5 sites of natural landscape from forest to desert. Landscapes are temperate forest, temperate grassland, temperate shrub-grassland, temperate shrub desert, and temperate desert. Root mass density and carbon contents at the profile were determined for each site. The results showed that considerable decrease in root biomass and soil organic carbon content at the soil profile of 0-3 m when landscape varied from forest to desert along a precipitation gradient, while soil inorganic carbon content increased significantly along the precipitation gradient. Namely, for density of soil organic carbon: forest > grassland > shrub-grassland > shrub desert > desert; for density of soil inorganic carbon: forest, grassland < shrub-grassland < shrub desert < desert (P<0.05 in all cases). In landscapes other than forest, more than 50% soil carbon storage was found in 1-3 m depth. For grassland and shrub-grassland, the contribution from 1-3 m was mainly in the form of organic carbon, while for shrub desert and desert the contribution from this depth was mainly in the form of inorganic carbon. The comparison of soil C storage between top 0-1 m and 1-3 m showed that the using top 1 m of soil profile to estimate soil carbon storages would considerably underestimate soil carbon storage. This is especially true for organic soil carbon at grassland region, and for soil inorganic carbon at desert region.
机译：了解土壤剖面中有机/无机碳储量的分布对于评估区域，大陆和全球土壤碳储量并预测全球变化的后果至关重要。然而，对于各种景观下深层土壤中的有机/无机碳储量知之甚少。这项研究旨在确定从森林到沙漠的5个自然景观点在0-3 m的土壤剖面中的土壤有机/无机碳储量。景观包括温带森林，温带草原，温带灌木草地，温带灌木沙漠和温带沙漠。确定每个部位剖面的根质量密度和碳含量。结果表明，当景观从森林到沙漠随降水梯度变化时，在0-3 m土壤剖面，根系生物量和土壤有机碳含量显着下降，而土壤无机碳含量沿降水梯度显着增加。即，对于土壤有机碳的密度：森林>草地>灌木草地>灌木沙漠>沙漠；土壤无机碳密度测定：森林，草地<灌木丛草地<灌木沙漠<沙漠（所有情况下，P <0.05）。在除森林外的其他景观中，发现1-3 m深度的土壤碳储量超过50％。对于草地和灌木丛草地，1-3 m的贡献主要是有机碳，而对于灌木荒漠和沙漠，来自该深度的贡献主要是无机碳。在0-1 m和1-3 m顶部土壤碳储量的比较表明，使用顶部1 m的土壤剖面估算土壤碳储量将大大低估土壤碳储量。对于草原地区的有机土壤碳和沙漠地区的土壤无机碳，尤其如此。

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  • 来源
    《Science of the total environment》 |2010年第8期|p.1925-1931|共7页
  • 作者

    Yugang Wang; Yan Li; Xuehua Ye; Yu Chu; Xinping Wang;

  • 作者单位

    Fukang Station of Desert Ecology, PR China Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi, Xinjiang 830011, PR China;

    Fukang Station of Desert Ecology, PR China Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi, Xinjiang 830011, PR China Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi, Xinjiang 830011. PR China;

    Erdos Station of Grassland Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China;

    Erdos Station of Grassland Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, PR China;

    Shapotou Desert Research and Experiment Station, Cold and Arid regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 73000, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    landscape type; deep soil; precipitation gradient; root density;

    机译：景观类型深土降水量梯度根系密度;

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