| Effect of continuous cotton cropping on soil nitrogen content and its transformation rate in arid area |
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| DOI：10.7606/j.issn.1000-7601.2019.02.10 |
| Key Words: cotton field for continuous cropping nitrogen forms nitrogen transformation rate soil pH soil moisture arid area |
| Author Name | Affiliation | | HE Xue-min | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China；Post-Doctoral Research Center for Ecology,Xinjiang University, Urumqi, Xinjiang 830046, China；Xinjiang Key Laboratory of Oasis Ecology, Urumqi, Xinjiang 830046, China | | LV Guang-hui | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China；Post-Doctoral Research Center for Ecology,Xinjiang University, Urumqi, Xinjiang 830046, China；Xinjiang Key Laboratory of Oasis Ecology, Urumqi, Xinjiang 830046, China | | QIN Lu | Xinjiang Academy of Environmental Protection Science, Urumqi, Xinjiang 830011, China | | LI Yan | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China；Post-Doctoral Research Center for Ecology,Xinjiang University, Urumqi, Xinjiang 830046, China；Xinjiang Key Laboratory of Oasis Ecology, Urumqi, Xinjiang 830046, China | | LIU Xiao-xing | Yili State Environmental Monitoring Detachment, Yining, Xinjiang 835000, China |
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| Abstract: |
| Continuous cotton cropping has certain negative effects on soil nutrients status, especially nitrogen (N) content and its transformation rate. Investigating the differences and their influence factors of soil N and N transformation rates in different continuous cropping years in arid area, which could provide a theoretical basis for the sustainable development of farmland in arid area. Soil samples from 0~20 cm layers were collected from uncultivated land (0 year, as a control) and five continuous cropping cotton fields at different cultivation times of 1, 5, 10, 20, and 30 years, respectively. Based on the changes of soil physical and chemical properties in the continuous cotton cropping field, combined with soil N contents and N transformation rates, we studied the change of N conversion rate and ecological driving factors in the continuous cotton cropping field. The results showed that: (1) Soil nitrate N was the main component of inorganic N in the continuous cotton cropping field in arid area. There was no significant difference among years and total nitrate N was generally low with an average of 5.56±0.28 mg·kg-1. Soil available N content in the soil was significantly lower than in uncultivated soil, which were only 16.37%~28.40% of the control (P<0.05). Soil ammonium N and nitrite N reached balance with years of continuous cropping; (2) The early stage of continuous cropping had significantly lower soil nitrification and denitrification rates that reached the lowest at 10 years (23.62±1.45 μg·kg-1·h-1 and 5.673±4.632 μg·kg-1·h-1, respectively). Then, it increased with increasing time, especially, in the later time; (3) Soil pH had the most influence on soil nitrification and denitrification rates (The total effects were 0.5310 and 0.6516, respectively). The thresholds of soil pH values for the soil nitrification and denitrification were 8.37 and 8.01, at which the soil nitrification and denitrification rates were at the maximum of 91.333 μg·kg-1·h-1 and the minimum rate of 19.271 μg·kg-1·h-1, respectively. Soil moisture was the second important factor affecting denitrification. |
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