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首页»科研成果» 2015
张芳、王秀君在CATENA发表论文
全球院
Soil organic and inorganic carbon in the loess profiles of Lanzhou area: implications of deep soils Fang Zhanga, Xiujun Wanga, b, Tianwen Guoc, Pingliang Zhangc, Jiaping Wangd a College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China b Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA c Gansu Academy of Agricultural Sciences, Lanzhou 730070, Gansu, China d State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China ABSTRACT Soil organic carbon (SOC) and inorganic carbon (SIC) are important carbon reservoirs in arid and semi-arid regions. Field data for quantifying both SOC and SIC in deep soils have been lacking. A study was carried out to evaluate soil carbon stocks in the loess of Lanzhou, a typical semiarid area of northwestern China. Soil samples were mainly collected from profiles of upper 2 meters in irrigated and non-irrigated agricultural land. Our data showed that SOC content decreased with depth, from 7.0 ± 2.0 g kg− 1 in the 0–0.2 m to less than 3.0 ± 2.0 g kg− 1 below 1 m. There was a large variation (3–11 g kg− 1) in SOC of the topsoil (0–0.2 m) but a narrow range of 1–5 g kg− 1 below 1.0 m. Soil inorganic carbon content showed little vertical changes with mean value of 16.0 ± 2.5 g kg− 1 in the 0–2 m, but a considerable spatial variation of 10 ~ 21 g kg− 1in the topsoil. Irrigation slightly enhanced SIC stock in the whole soil profile, with ~ 10% increase in the 0–30 cm. We estimated that SOC stock was approximately 10 kg C m− 2 for the 0–2 m, and the SIC stock was about four times of the SOC stock. The SOC and SIC stocks in the subsoil (1–2 m) were ~ 40% and 50% of the stocks over the 0–2 m, respectively. The estimated total carbon stock was 26.8 kg C m− 2 over the 0–1 m, but 50.0 kg C m− 2 over the 0–2 m. Our study implies that neglecting deep soil may lead to underestimation of soil carbon stock by ~ 50% in the loess. KEY WORDS: Soil inorganic carbon; Soil organic carbon; Loess; Deep soil; Semi-arid region PUBLISHED BY: CATENA, 2014, 126: 68-74 SOURCE: http://www.sciencedirect.com/science/article/pii/S0341816214003142 |
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