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Fertilization enhancing carbon sequestration as carbonate in 
arid cropland: assessments of longterm experiments in northern
 China

 

Wang, X. J. ^1,2; Xu, M. G. ³; Wang, J. P^1,4.; Zhang, W. J.³; Yang, X. Y.⁵; Huang,S. M.⁶; Liu, H.⁷

 

1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China

2 College of Global Change and Earth System Science, Beijing Normal University and Joint Center for Global Change Studies, Xinjiekouwai Street No.19, Haidian District, Beijing 100875, China

3Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

4 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

5 College of Natural Resources and Environment, Northwest Agricultural and Forestry Science and Technology University, Yangling, Shaanxi 712100, China

6 Institute of Plant Nutrition, Resources and Environment, Henan Academy of Agricultural Sciences, Zhengzhou, Henan 450002, China

7 Institute of Soil and Fertilizer and Agricultural SparingWater,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China

 

ABSTRACT

Aims

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.

Methods

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 13C compositions were determined over the range 0–100 cm.

Results

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.

Conclusions

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.

 

KEY WORDS: Soil carbonate, Stable ¹³C composition, Carbon sequestration, Fertilization, Cropland, Arid region

 

PUBLISHED BY: PLANT AND SOIL, 2014, 380 (1-2): 89-100

 

SOURCE: http://link.springer.com/article/10.1007/s11104-014-2077-x