Fertilization enhancing carbon sequestration as carbonate in arid cropland: assessments of long-term experiments in northern China
文献类型： 外文期刊
作者： Wang, X. J. 1 ; Xu, M. G. 4 ; Wang, J. P. 1 ; Zhang, W. J. 4 ; Yang, X. Y. 6 ; Huang, S. M. 7 ; Liu, H. 8 ;
作者机构： 1.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Xinjiang Inst Ecol & Geog, 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.Chinese Acad Agr Sci, Minist Agr, Key Lab Crop Nutr & Fertilizat, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
5.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
6.Northwest Agr & Forestry Sci & Technol Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
7.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm, Zhengzhou 450002, Henan, Peoples R China
8.Xinjiang Acad Agr Sci, Inst Soil & Fertilizer & Agr Sparing Water, Urumqi
关键词： Soil carbonate;Stable 13C composition;Carbon sequestration;Fertilization;Cropland;Arid region
期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）
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收录情况： SCI
摘要： Soil inorganic carbon (SIC), primarily calcium carbonate, is a major reservoir of carbon in arid lands. This study was designed to test the hypothesis that carbonate might be enhanced in arid cropland, in association with soil fertility improvement via organic amendments.We obtained two sets (65 each) of archived soil samples collected in the early and late 2000's from three long-term experiment sites under wheat-corn cropping with various fertilization treatments in northern China. Soil organic (SOC), SIC and their Stable C-13 compositions were determined over the range 0-100 cm.All sites showed an overall increase of SIC content in soil profiles over time. Particularly, fertilizations led to large SIC accumulation with a range of 101-202 g C m(-2) y(-1) in the 0-100 cm. Accumulation of pedogenic carbonate under fertilization varied from 60 to 179 g C m(-2) y(-1) in the 0-100 cm. Organic amendments significantly enhanced carbonate accumulation, in particular in the subsoil.More carbon was sequestrated in the form of carbonate than as SOC in the arid cropland in northern China. Increasing SOC stock through long-term straw incorporation and manure application in the arid and semi-arid regions also enhanced carbonate accumulation in soil profiles
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