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Carbon accumulation in arid croplands of northwest China: pedogenic carbonate exceeding organic carbon

文献类型： 外文期刊

作者： Wang, Xiujun 1 ; Wang, Jiaping 1 ; Xu, Minggang 6 ; Zhang, Wenju 6 ; Fan, Tinglu 7 ; Zhang, Juan 8 ;

作者机构： 1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang, Peoples R China

2.Beijing Normal Univ, Coll Global Change & Earth Syst Sci, Beijing 100875, Peoples R China

3.Joint Ctr Global Change Studies, Beijing 100875, Peoples R China

4.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA

5.Shihezi Univ, Coll Agr, Shihezi 832003, Xinjiang, Peoples R China

6.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Crop Nutr & Fertilizat, Minist Educ, Beijing 100081, Peoples R China

7.Gansu Acad Agr Sci, Dryland Agr Inst, Lanzhou 730070, Gansu, Peoples R China

8.Northeast Agr Univ, Sch Resource & Environm, Harbin 150030, Heilongjiang, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2015 年 5 卷

页码：

收录情况： SCI

摘要： Soil carbonate (SIC) exceeds organic carbon (SOC) greatly in arid lands, thus may be important for carbon sequestration. However, field data for quantifying carbonate accumulation have been lacking. This study aims to improve our understanding of SIC dynamics and its role in carbon sequestration. We analyzed two datasets of SOC and SIC and their C-13 compositions, one with over 100 soil samples collected recently from various land uses in the Yanqi Basin, Xinjiang, and the other with 18 archived soil samples from a long-term experiment (LTE) in Pingliang, Gansu. The data from the Yanqi Basin showed that SOC had a significant relationship with SIC and pedogenic carbonate (PIC); converting shrub land to cropland increased PIC stock by 5.2 kg C m(-2), which was 3.6 times of that in SOC stock. The data from the LTE showed greater accumulation of PIC (21-49 g C m(-2) year(-1)) than SOC (10-39 g C m(-2) year(-1)) over 0-20 cm. Our study points out that intensive cropping in the arid and semi-arid regions leads to an increase in both SOC and PIC. Increasing SOC through straw organic amendments enhances PIC accumulation in the arid cropland of northwestern China.

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