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Contributions of wheat and maize residues to soil organic carbon under long-term rotation in north China

文献类型： 外文期刊

作者： Wang, Jinzhou 1 ; Wang, Xiujun 2 ; Xu, Minggang 1 ; Feng, Gu 3 ; Zhang, Wenju 1 ; Yang, Xueyun 7 ; Huang, Shaomin;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Crop Nutr & Fertilizat, Minist Agr, Beijing 100081, Peoples R China

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

3.China Agr Univ, Coll Resources & Environm Sci, Beijing 100094, Peoples R China

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

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

6.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang, Peoples R China

7.Northwest Agr & Forestry

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 organic carbon (SOC) dynamics in agro-ecosystem is largely influenced by cropping. However, quantifying the contributions of various crops has been lacking. Here we employed a stable isotopic approach to evaluate the contributions of wheat and maize residues to SOC at three long-term experimental sites in north China. Soil samples were collected from 0-20, 20-40, 40-60, 60-80 and 80-100 cm after 13 and 20 years of wheat-maize rotation, and SOC and its stable C-13 composition were determined. Our data showed that the delta C-13 value of SOC varied, on average, from -22.1% in the 0-20 cm to -21.5% in the 80-100 cm. Carbon input through maize residues ranged from 35% to 68% whereas the contribution of maize residues to SOC (0-40 cm) ranged from 28% to 40%. Our analyses suggested that the retention coefficient was in the range of 8.0-13.6% for maize residues and 16.5-28.5% for wheat residues. The two-fold higher retention coefficient of wheat versus maize residues was due to the differences in the quality of residues and probably also in the temperature during the growing season. Our study highlighted the importance of crop management on carbon sequestration in agricultural lands.

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