Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (8): 1513-1520.doi: 10.3864/j.issn.0578-1752.2012.08.007

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Straw Returning on Characteristics of Soil Aggregates in Semi-arid Areas in Southern Ningxia of China

 ZHANG  Peng, JIA  Zhi-Kuan, WANG  Wei, LU  Wen-Tao, GAO  Fei, NIE  Jun-Feng   

  1. 1.西北农林科技大学中国旱区节水农业研究院，陕西杨凌 712100
    2.农业部旱地作物生产与生态重点开放实验室，陕西杨凌 712100
  • Received:2011-07-04 Online:2012-04-15 Published:2011-08-29

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Abstract: 【Objective】 A field experiment was conducted to determine the effects of straw returning systems on soil aggregate of millet or corn under different straw returning supplies. in order to provide a theoretical basis for establishment of a fertilization system and crop management for semi-arid areas of southern Ningxia.【Method】The effects of straw returning, taking no straw returning as the control, on soil aggregate indexes by dry and wet sieving under different straw returning treatments (3 000 kg•hm-2 (L), 6 000 kg•hm-2 (M) and 9 000 kg•hm-2 (H) of millet straw and 4 500 kg•hm-2 (L), 9 000 kg•hm-2 (M) and 13 500 kg•hm-2 (H)    of corn straw) were studied for four years (2007-2010).【Result】After the millet harvest (2010), dry sieving results showed that DR0.25, DMWD and DGMD of straw returning treatments higher than CK, the fractal dimension lower than CK in 0-40 cm soil  layer, significantly. Wet sieving results showed that straw returning treatments had different effects on the WGMD, WMWD and fractal dimension of 0-40 cm soil layer, which followed the order from high to low: H,M＞L＞CK. There is a ‘Z’ tendency of PAD and ELT in 0-40 cm soil layer for each treatment, and CK is significantly higher than straw returning treatments(P＜0.05). 【Conclusion】 The content of soil aggregates could be improved efficiently by using straw returning technology in semi-arid areas of Southern Ningxia.

Key words: straw returning, soil aggregate, semi-arid areas of southern Ningxia

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