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Journal of Arid Land  2014, Vol. 6 Issue (4): 468-477    DOI: 10.1007/s40333-014-0003-y
Research Articles     
Effects of cotton field management practices on soil CO2 emission and C balance in an arid region of Northwest China
QianBing ZHANG1,2, Ling YANG1, ZhenZhu XU3, YaLi ZHANG1, HongHai LUO1, Jin WANG4, WangFeng ZHANG1
1 Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Groups, College of Agriculture, Shihezi Univer¬sity, Shihezi 832003, China;
2 College of Animal Science & Technology, Shihezi University, Shihezi 832003, China;
3 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
4 Wulanwusu Agrometeorological Experiment Station of Xinjiang, Shihezi 832003, China
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Abstract  Changes in both soil organic C storage and soil respiration in farmland ecosystems may affect atmospheric CO2 concentration and global C cycle. The objective of this field experiment was to study the effects of three crop field management practices on soil CO2 emission and C balance in a cotton field in an arid region of Northwest China. The three management practices were irrigation methods (drip and flood), stubble managements (stubble-incorporated and stubble-removed) and fertilizer amendments (no fertilizer (CK), chicken manure (OM), inorganic N, P and K fertilizer (NPK), and inorganic fertilizer plus chicken manure (NPK+OM)). The results showed that within the C pool range, soil CO2 emission during the whole growing season was higher in the drip irrigation treatment than in the corresponding flood irrigation treatment, while soil organic C concentration was larger in the flood irrigation treatment than in the corresponding drip irrigation treatment. Furthermore, soil CO2 emission and organic C concentration were all higher in the stubble-incorporated treatment than in the corresponding stubble-removed treatment, and larger in the NPK+OM treatment than in the other three fertilizer amendments within the C pool range. The combination of flood irrigation, stubble incorporation and application of either NPK+OM or OM increased soil organic C concentration in the 0−60 cm soil depth. Calculation of net ecosystem productivity (NEP) under different management practices indicated that the combination of drip irrigation, stubble incorporation and NPK+OM increased the size of the C pool most, followed by the combination of drip irrigation, stubble incorporation and NPK. In conclusion, management practices have significant impacts on soil CO2 emission, organic C concentration and C balance in cotton fields. Consequently, appropriate management practices, such as the combination of drip irriga¬tion, stubble incorporation, and either NPK+OM or NPK could increase soil C storage in cotton fields of Northwest China.

Key wordsvegetation cover      precipitation      land use      the Grain for Green Program      the He-Long region     
Received: 13 July 2013      Published: 12 August 2014

The National Basic Re¬search Program of China (2006CB708401) and the Doctor Subject Foundation of the Ministry of Education of China (20116518110002).

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Cite this article:

QianBing ZHANG, Ling YANG, ZhenZhu XU, YaLi ZHANG, HongHai LUO, Jin WANG, WangFeng ZHANG. Effects of cotton field management practices on soil CO2 emission and C balance in an arid region of Northwest China. Journal of Arid Land, 2014, 6(4): 468-477.

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