Soil organic carbon dynamics under long-term fertilizations in arable land of northern China
文献类型： 外文期刊
作者： Zhang, W. J. 1 ; Wang, X. J. 2 ; Xu, M. G. 1 ; Huang, S. M. 4 ; Liu, H. 5 ; Peng, C. 6 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Crop Nutr & Fertilizat, Beijing 100081, Peoples R China
2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830000, Peoples R China
3.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA
4.Henan Acad Agr Sci, Inst Soil & Fertilizer, Zhengzhou 450002, Henan, Peoples R China
5.Xinjiang Acad Agr Sci, Inst Soil & Fertilizer & Agr Sparing Water, Urumqi 830091, Peoples R China
6.Jilin Acad Agr Sci, Inst Soil & Fertilizer, Changchun 130001, Peoples R China
期刊名称：BIOGEOSCIENCES （ 影响因子：4.295； 五年影响因子：4.787 ）
ISSN： 1726-4170
年卷期： 2010 年 7 卷 2 期
页码：
收录情况： SCI
摘要： Soil carbon sequestration is a complex process influenced by agricultural practices, climate and soil conditions. This paper reports a study of long-term fertilization impacts on soil organic carbon (SOC) dynamic from six long-term experiments. The experiment sites are located from warm-temperate zone with a double-cropping system of corn (Zea mays L.) - wheat (Triticum Aestivium L.) rotation, to mild-temperate zones with mono-cropping systems of continuous corn, or a three-year rotation of corn-wheat-wheat. Mineral fertilizer applications result in an increasing trend in SOC except in the arid and semi-arid areas with the mono-cropping systems. Additional manure application is important to maintain SOC level in the arid and semi-arid areas. Carbon conversion rate is significant lower in the warm-temperate zone with double cropping system (6.8%-7.7%) than that in the mild-temperate areas with mono-cropping systems (15.8%-31.0%). The conversion rate is significantly correlated with annual precipitation and active accumulative temperature, i.e., higher conversion rate under lower precipitation and/or temperature conditions. Moreover, soil high in clay content has higher conversion rate than soils low in clay content. Soil carbon sequestration rate ranges from 0.07 to 1.461 t ha(-1) year(-1) in the upland of northern China. There is significantly linear correlation between soil carbon sequestration and carbon input at most sites, indicating that these soils are not carbon-saturated thus have potential to migrate more CO(2) from atmosphere.
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