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Inorganic Phosphorus Distribution in Soil Aggregates Under Different Cropping Patterns in Northwest China

  • Zhibo Cheng
  • Yun Chen
  • William Jeffrey Gale
  • Fenghua ZhangEmail author
Research Article

Abstract

Accurate information on soil inorganic phosphorus (Pi) is crucial for the sustainable development of agriculture in arid regions. An experiment was conducted to investigate the effect of cropping patterns on Pi concentrations in soil aggregates from the 0–10 cm depth in northwest China. The three cropping patterns were as follows: continuous cotton (CC), corn-wheat rotation (CW), and tree-cotton intercropping (TC). The results showed that more than 89% of the soil mass was in the macroaggregates (> 0.25 mm) in all cropping patterns, indicating a good soil structure in the study area. Total Pi and available P concentrations were significantly higher in the < 0.053 mm aggregate size class than in other classes (p < 0.05). As the dominant component, the Ca10-P accounted for 48.0–53.8% of total soil Pi. The Ca10-P concentrations decreased in the order CC > TC > CW. Additionally, the O-P concentrations were enriched in the CC treatment. But, the Ca8-P, Al-P and Fe-P concentrations were significantly greater in CW and TC than in CC. These results suggested that continuous cotton production leads to plant available Pi (Ca8-P, Al-P, and Fe-P) convert into unavailable Pi forms (Ca10-P and O-P). The TC system had the greatest contribution to total P in > 0.25 mm aggregates (p < 0.05), suggesting TC had a greater capacity to supply soil P. TC may be an appropriate farming practice for maximum availability of P in arid farmland ecosystems.

Keywords

Aggregate fractions Inorganic phosphorus Cropping patterns Arid zone 

Notes

Acknowledgements

The authors are grateful to Dr Phillip Ford (CSIRO) for the improvement of this paper.

Funding information

This research was supported by the National Natural Science Foundation of China (31860360) and National Key Research and Development Program of China (2016YFC0501406).

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Copyright information

© Sociedad Chilena de la Ciencia del Suelo 2019

Authors and Affiliations

  • Zhibo Cheng
    • 1
    • 2
  • Yun Chen
    • 2
  • William Jeffrey Gale
    • 1
  • Fenghua Zhang
    • 1
    Email author
  1. 1.College of AgronomyShihezi UniversityXinjiangChina
  2. 2.CSIRO Land and WaterCanberraAustralia

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