Soil organic carbon dynamics under long-term fertilizations in arable land of northern China

文献类型： 外文期刊

第一作者： Zhang, W. J.

作者： Zhang, W. J.;Xu, M. G.;Wang, X. J.;Wang, X. J.;Huang, S. M.;Liu, H.;Peng, C.

作者机构：

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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