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Effects of long-term fertilization on soil labile carbon fractions and aggregates in an arid area.

RONG Jing-rong1,2, ZHONG Wen-shao3, LIU Yan1, WANG Yu-gang1**   

  1. (1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences,
    Urumqi 830011, China; 2Yichun City Center for Disease Control and Prevention, Yichun 153000, Heilongjiang, China; 3The 222nd Group of Xinjiang Production and Construction Crops, Fukang 831505, Xinjiang, China)
  • Online:2013-10-10 Published:2013-10-10

Abstract: This paper studied the variation patterns of soil labile organic carbon fractions and water stable aggregates in oasis cropland under effects of different long term fertilization treatments, which could have significance in evaluating oasis cropland soil quality and regional carbon cycle. The study was conducted on an oasis cropland in Xinjiang of Northwest China, and installed four treatments, i.e., long-term (20 years) abandoned cultivation, no fertilization, chemical fertilization, and chemical plus organic fertilization. Cultivation conduced to the accumulation of particulate organic carbon, dissolved organic carbon, dissolved inorganic carbon, and water stable macro-aggregates (>0.25 mm) in surface soil (0-20 cm). As compared with no fertilization, chemical plus organic fertilization more conduced to the accumulation of soil labile carbon fractions and the formation and stability of water stable macro-aggregates. In the same treatments, the particulate organic carbon and water stable macro-aggregates in surface soil played a dominant role to their accumulation throughout the soil profile, while the dissolved organic and inorganic carbon in surface soil had a contrast tendency. There was a significant positive correlation between the soil labile carbon fractions and aggregate stability.

Key words: elevation, life form, nutrient status., water use efficiency